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  1. Employees

Språkvelger

Norsk

Geir Johnsen

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Geir Johnsen

Professor
Department of Biology

geir.johnsen@ntnu.no
+4773591581 +4791897027 Biologisk stasjon, 01.nov, Trondheim, Bynesveien 46
About Publications Teaching Outreach

About

CV

Geir Johnsen is a professor in marine biology at the Department of Biology (NTNU), Prof II at University Centre on Svalbard (UNIS), and is one of the founding partners in a NTNU spin-off company Ecotone using new optical techniques for mapping and monitoring the marine environment. He is a key scientist in the Centre of excellence (CeO) "Autonomous Marine Operations and Systems (AMOS). Currently he is on a 1 year research stay at University of Hawaii at Manoa, Honululu working with spectral bioluminescence in different taxa and mapping and monitoring of coral reefs.

Research areas

  • Marine ecology and biodiversity
  • Bio-optics
  • Photosynthesis
  • Pigment chemotaxonomy
  • Underwater robotics and sensor development for in situ identification
  • Mapping and monitoring of bio-geo-chemical objects of interest in the marine environment

He has been an adviser for 47 MSc students and 17 PhD candidates. Currently, he advises 3 MSc students and 5 PhD candidates.

He has published more than 130 papers in international scientific journals and been a co-editor for the books:

  • "Ecosystem Barents Sea" (Tapir Academic Press)
  • "Phytoplankton pigments: Updates on Characterization, Chemotaxonomy and Applications in Oceanography" (Cambridge University Press, 2011). 

Publications

  • Chronological
  • By category
  • See all publications in Cristin

2025

  • Berge, Jørgen; Bakken, Torkild; Heggland, Kristin; Sneli, Jon-Arne; Ødegård, Øyvind; Ingulstad, Mats. (2025) Exploring Climate Change, Geopolitics, Marine Archeology, and Ecology in the Arctic Ocean Through Wood-Boring Bivalves. Oceanography
    Academic article

2024

  • Ingulstad, Mats; Bakken, Torkild; Ellefmo, Steinar Løve; Johnsen, Geir; Hagspiel, Verena. (2024) Villedende om hypotetiske havbunnsmineraler?. Dagens næringsliv
    Reader opinion piece
  • Ingulstad, Mats; Bakken, Torkild; Ellefmo, Steinar Løve; Johnsen, Geir; Hagspiel, Verena. (2024) Norge mangler kunnskap om gruvedrift i dyphavet. Gemini (English edition)
    Feature article
  • Førde, Hedda; Grant, Stephen Denis; Viljanen, Martta; Majaneva, Sanna Kristiina; Johnsen, Geir. (2024) Glow and Know – Evaluating the Potential of Spectral Bioluminescence as a Tool for Zooplankton Identification in situ. NTNU
    Masters thesis
  • Viljanen, Martta; Førde, Hedda; Majaneva, Sanna Kristiina; Grant, Stephen Denis; Johnsen, Geir. (2024) Zooplankton spectral bioluminescence database.
    Database
  • Five, Taran; Majaneva, Sanna Kristiina; Viljanen, Martta; Grant, Stephen Denis; Johnsen, Geir. (2024) Studying Behavioral Responses to Bioluminescence in Zooplankton. NTNU
    Masters thesis
  • Ingulstad, Mats; Bakken, Torkild; Ellefmo, Steinar Løve; Hagspiel, Verena; Johnsen, Geir. (2024) Feil på feil om gruvedrift på havbunnen - Stortingsmeldingen om gruvedrift på havbunnen holder ikke vann. Dagens næringsliv
    Feature article
  • Ingulstad, Mats; Bakken, Torkild; Johnsen, Geir; Ellefmo, Steinar Løve; Hagspiel, Verena. (2024) Norway needs to know much more before actually mining the deep sea. Norwegian SciTech News
    Feature article
  • Berge, Jørgen; Johnsen, Geir; Last, Kim; Cohen, Jonathan H.; McKee, David. (2024) Light in polar regions. Orkana Forlag
    Chapter
  • Overrein, Martin Molberg; Tinn, Phil; Aldridge, David; Johnsen, Geir; Moreira Fragoso, Glaucia. (2024) Biomass estimations of cultivated kelp using underwater RGB images from a mini-ROV and computer vision approaches. Frontiers in Marine Science
    Academic article
  • Schartmüller, Bernhard; Mckee, David; Berge, Jørgen; Johnsen, Geir. (2024) Calibration verification of an underwater hyperspectral imaging push broom instrument to measure light in absolute units and field demonstration. Applied Optics
    Academic article
  • Faltynkova, Andrea; Deschenes, Catherine; Zolich, Artur; Wagner, Martin; Johansen, Tor Arne; Johnsen, Geir. (2024) Use of an uncrewed surface vehicle and near infrared hyperspectral imaging for sampling and analysis of aquatic microplastics. Marine Pollution Bulletin
    Academic article
  • Moreira Fragoso, Glaucia; Dallolio, Alberto; Grant, Stephen Denis; Garrett, Joseph Landon; Ellingsen, Ingrid Helene; Johnsen, Geir. (2024) The Role of Rapid Changes in Weather on Phytoplankton Spring Bloom Dynamics From Mid-Norway Using Multiple Observational Platforms. Journal of Geophysical Research (JGR): Oceans
    Academic article
  • Liu, Hongbo; Summers, Natalie Maria; Chen, Yi-Chun; Løvås, Håvard Snefjellå; Johnsen, Geir; Koestner, Daniel Warren. (2024) Pixelwise immersion factor calibration for underwater hyperspectral imaging instruments. Optics Express
    Academic article
  • Moreira Fragoso, Glaucia; Dallolio, Alberto; Grant, Stephen Denis; Garrett, Joseph Landon; Ellingsen, Ingrid Helene; Johnsen, Geir. (2024) The Role of Rapid Changes in Weather on Phytoplankton Spring Bloom Dynamics Captured by an Autonomous Uncrewed Surface Vehicle. Earth and Space Science
    Academic article
  • Mo-Bjørkelund, Tore; Majaneva, Sanna Kristiina; Moreira Fragoso, Glaucia; Johnsen, Geir; Ludvigsen, Martin. (2024) Multi-vehicle adaptive 3D mapping for targeted ocean sampling. PLOS ONE
    Academic article

2023

  • Bakken, Sivert; Luis, Kelly; Johnsen, Geir; Johansen, Tor Arne. (2023) Evaluating hyperspectral Secchi depth retrieval through hybrid modeling and regression. Workshop on Hyperspectral Image and Signal Processing, Evolution in Remote Sensing
    Academic article
  • Sørensen, Asgeir Johan; Ludvigsen, Martin; Sivertsen, Eirik Selnæs; Johnsen, Geir; Johansen, Tor Arne. (2023) Hvem skal samle inn, forvalte og ha tilgang til informasjon om havområdene? . Gemini.no
    Feature article
  • Sørensen, Asgeir Johan; Ludvigsen, Martin; Sivertsen, Eirik; Johnsen, Geir; Johansen, Tor Arne. (2023) Hvem skal samle inn, forvalte og ha tilgang til informasjon om havområdene? . Forskning.no
    Feature article
  • Deschenes, C; Zolich, Artur; Wagner, Martin; Johnsen, Geir; Johansen, Tor Arne; Faltynkova, Andrea. (2023) Unmanned vehicle and hyperspectral imager for a more rapid microplastics sampling and analysis. OCEANS
    Academic article
  • Oftedahl, Live; Sørensen, Asgeir Johan; Johnsen, Geir. (2023) NTNUs first research satellite on the first mission in the Arctic.
    Website (informational material)
  • Nordahl, A; Dugstad, L; Magnussen, O; Bakken, JB; Johnsen, Geir. (2023) Laksegriseriet. Dagens næringsliv
    Interview Journal
  • Carson, Siri Granum; Jenssen, Munro, Bjoern; Johnsen, Geir; Mason, Arthur. (2023) En bærekraftig fremtid for Svalbard – er utvinning av dyphavsmineraler en del av svaret?. Svalbardposten
    Feature article
  • Anderson, Philip; Berge, Jørgen; Granskog, Mats A.; Divine, Dmitry V; Katlein, Christian; Itkin, Polona. (2023) Upwelling and downwelling visible radiation measurements of the autonomous ice-tethered OptiCAL 'ee' buoy deployed during MOSAiC in the Sea Ice Ridge Observatory area.
    Other product
  • Svendsen, Thea; Majaneva, Sanna Kristiina; Majaneva, Markus; Båtnes, Anna Solvang; Johnsen, Geir. (2023) The usability of eDNA to identify and quantify zooplankton communities. NTNU
    Masters thesis
  • Krohn-Pettersen, Gitte; Majaneva, Sanna Kristiina; Viljanen, Martta; Grant, Stephen Denis; Johnsen, Geir. (2023) Blinks in the dark - Detecting and characterizing flash kinetics of bioluminescence for in situ species recognition of zooplankton. NTNU
    Masters thesis
  • Summers, Natalie Maria; Moreira Fragoso, Glaucia; Johnsen, Geir. (2023) Photophysiologically active green, red, and brown macroalgae living in the Arctic Polar Night. Scientific Reports
    Academic article
  • Sørensen, Asgeir Johan; Ludvigsen, Martin; Sivertsen, Eirik Selnæs; Johnsen, Geir; Johansen, Tor Arne. (2023) Hvem skal samle inn, forvalte og ha tilgang til informasjon om havområdene? . Teknisk Ukeblad
    Feature article
  • Sørensen, Asgeir Johan; Ludvigsen, Martin; Siversten, Eirik; Johnsen, Geir; Johansen, Tor Arne. (2023) Who should collect, manage and have access to data from the oceans?. sciencenorway.no
    Feature article
  • oudijk, AE; Johansen, Tor Arne; Johnsen, Geir; Alver, Morten Omholt. (2023) Simulating Hyperspectral Datacubes for Ocean Color: A Foundation for Phytoplankton Recognition in Spectral Signatures. OCEANS
    Academic article
  • Schartmuller, Bernhard; Anderson, Philip; Mckee, David; Connan-McGinty, Stacey; Kopec, Tomasz Piotr; Daase, Malin Hildegard Elisabeth. (2023) Development and calibration of a high dynamic range and autonomous ocean-light instrument to measure sub-surface profiles in ice-covered waters. Applied Optics
    Academic article
  • Anderson, Philip; Berge, Jørgen; Granskog, Mats A.; Divine, Dmitry V; Katlein, Christian; Itkin, Polona. (2023) Upwelling and downwelling visible radiation measurements of the autonomous ice-tethered OptiCAL 'gg' buoy deployed during MOSAiC in the Monster Bay area.
    Other product
  • Anderson, Philip; Berge, Jørgen; Granskog, Mats A.; Divine, Dmitry V; Katlein, Christian; Itkin, Polona. (2023) Upwelling and downwelling visible radiation measurements of the autonomous ice-tethered OptiCAL 'hh' buoy deployed during MOSAiC in the Dark site Second Year Ice. .
    Other product
  • Gerland, Sebastian; Ingvaldsen, Randi Brunvær; Reigstad, Marit; Sundfjord, Arild; Bogstad, Bjarte; Chierici, Melissa. (2023) Still Arctic? — The changing Barents Sea. Elementa: Science of the Anthropocene
    Academic literature review
  • Williamson, David Roddan; Moreira Fragoso, Glaucia; Majaneva, Sanna Kristiina; Dallolio, Alberto; Halvorsen, Daniel Ørnes; Hasler, Oliver Kevin. (2023) Monitoring Algal Blooms with Complementary Sensors on Multiple Spatial and Temporal Scales. Oceanography
    Academic article
  • Bakken, Sivert; Henriksen, Marie Bøe; Birkeland, Roger; Langer, Dennis David; Oudijk, Adriënne Esmeralda; Berg, Simen. (2023) HYPSO-1 CubeSat: First Images and In-Orbit Characterization. Remote Sensing
    Academic article
  • Grant, Stephen Denis; Johnsen, Geir; Mckee, David; Zolich, Artur Piotr; Cohen, Jonathan H.. (2023) Spectral and RGB analysis of the light climate and its ecological impacts using an all-sky camera system in the Arctic. Applied Optics
    Academic article

2022

  • Zolich, Artur Piotr; Faltynkova, Andrea; Johnsen, Geir; Johansen, Tor Arne. (2022) Portable Catamaran Drone - an uncrewed sampling vehicle for micro-plastics and aquaculture research.
    Academic chapter/article/Conference paper
  • Bjerkvoll, Mikkel; Johnsen, Geir; Bakken, Torkild; Mogstad, Aksel Alstad. (2022) Aerial and underwater hyperspectral imagery for shallow benthic nature type mapping. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Masters thesis
  • Connan-McGinty, Stacey; Banas, Neil S.; Berge, Jørgen; Cottier, Finlo Robert; Grant, Stephen; Johnsen, Geir. (2022) Midnight Sun to Polar Night: A Model of Seasonal Light in the Barents Sea. Journal of Advances in Modeling Earth Systems
    Academic article
  • Søreng, Marte Opsahl; Johnsen, Geir; Bakken, Torkild; Mogstad, Aksel Alstad; Gryte, Kristoffer. (2022) Mapping of Zostera Habitat in the Sublittoral Zone using Underwater Hyperspectral Imaging and Unmanned Surface Vehicle. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Masters thesis
  • Marnor, Camilla Mult; Johnsen, Geir; Bakken, Torkild; Mogstad, Aksel Alstad. (2022) Mapping distribution patterns of brittle stars using ROV-based imaging. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Masters thesis
  • Johnsen, Geir; Aberle-Malzahn, Nicole; Fragoso, Glaucia; Thu, Maren. (2022) Phytoplankton Spring Bloom Mapping in Coastal Areas Using Autonomous Underwater Vehicle (AUV) and Optical Approaches. NTNU
    Masters thesis
  • Nøland, Annecken; Johnsen, Geir; Aberle-Malzahn, Nicole. (2022) Autonomous Underwater Vehicle (AUV) based study of zooplankton communities, using a silhouette camera and artificial intelligence. NTNU
    Masters thesis
  • Oudijk, Esmée; Hasler, Oliver Kevin; Øveraas, Henning; Marty, Sabine; Williamson, David Roddan; Svendsen, Torbjørn Karl. (2022) Campaign For Hyperspectral Data Validation In North Atlantic Coastal Waters. Workshop on Hyperspectral Image and Signal Processing, Evolution in Remote Sensing
    Academic article
  • Nevstad, Malin Bø; Johnsen, Geir; Bakken, Torkild; Larsen, Martin Kvisvik; Mogstad, Aksel Alstad. (2022) Use of different imaging systems for ROV-based mapping of complex benthic habitats. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Masters thesis
  • Fragoso, Glaucia Moreira; Davies, Emlyn John; Fossum, Trygve Olav; Ullgren, Jenny; Majaneva, Sanna; Aberle-Malzahn, Nicole. (2022) Contrasting phytoplankton-zooplankton distributions observed through autonomous platforms, in-situ optical sensors and discrete sampling. PLOS ONE
    Academic article
  • Summers, Natalie; Johnsen, Geir; Mogstad, Aksel Alstad; Løvås, Håvard; Fragoso, Glaucia Moreira; Berge, Jørgen. (2022) Underwater Hyperspectral Imaging of Arctic Macroalgal Habitats during the Polar Night Using a Novel Mini-ROV-UHI Portable System. Remote Sensing
    Academic article
  • Dona, Angela; Evertsen, Jussi; Johnsen, Geir. (2022) The role of parapodia and lack of photoacclimation in kleptoplasts of the sacoglossan sea slug Plakobranchus ocellatus. Coral reefs
    Academic article
  • Mogstad, Aksel Alstad; Løvås, Håvard; Sture, Øystein; Johnsen, Geir; Ludvigsen, Martin. (2022) Remote Sensing of the Tautra Ridge: An Overview of the World’s Shallowest Cold-Water Coral Reefs. Frontiers in Marine Science
    Academic article
  • Oftedahl, Live; Ødegård, Øyvind; Sørensen, Asgeir Johan; Johnsen, Geir. (2022) Oppdrag Mjøsa får internasjonal oppmerksomhet.
    Website (informational material)

2021

  • Ringvold, Halldis; Taite, Morag; Allcock, A. Louise; Vecchione, Michael; Péan, Michel; Sandulli, Roberto. (2021) In situ recordings of large gelatinous spheres from NE Atlantic, and the first genetic confirmation of egg mass of Illex coindetii (Vérany, 1839) (Cephalopoda, Mollusca). Scientific Reports
    Academic article
  • Bakken, Sivert; Johnsen, Geir; Johansen, Tor Arne. (2021) Analysis and Model Development of Direct Hyperspectral Chlorophyll-A Estimation for Remote Sensing Satellites. Workshop on Hyperspectral Image and Signal Processing, Evolution in Remote Sensing
    Academic article
  • Løvås, Håvard; Mogstad, Aksel Alstad; Sørensen, Asgeir Johan; Johnsen, Geir. (2021) A Methodology for Consistent Georegistration in Underwater Hyperspectral Imaging. IEEE Journal of Oceanic Engineering
    Academic article
  • Faltynkova, Andrea; Johnsen, Geir; Wagner, Martin. (2021) Hyperspectral imaging as an emerging tool to analyze microplastics: A systematic review and recommendations for future development. Microplastics and Nanoplastics
    Academic literature review
  • Johnsen, Geir; Zolich, Artur; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan H.; Mckee, David. (2021) All-sky camera system providing high temporal resolution annual time series of irradiance in the arctic. Applied Optics
    Academic article
  • Geoffroy, Maxime; Langbehn, Tom Jasper; Priou, Pierre; Varpe, Øystein; Johnsen, Geir; Le Bris, Arnault. (2021) Pelagic organisms avoid white, blue, and red artificial light from scientific instruments. Scientific Reports
    Academic article
  • Berge, Jørgen; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Johnsen, Geir. (2021) Time series (2018) of irradiance in the PAR (photosynthetically active radiation) region measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) derived from an USSIMO spectroradiometer. .
    Other product
  • Bazilchuk, Nancy Reney; Stahl, Annette; Johnsen, Geir; Saad, Aya; Thu, Maren; Nøland, Annecken. (2021) Sporhunden som lukter mikroalger. . Gemini.no
    Popular scientific article
  • Mogstad, Aksel Alstad; Johnsen, Geir; Sørensen, Asgeir Johan; Ludvigsen, Martin. (2021) Underwater hyperspectral imaging as a tool for benthic habitat mapping. Doktoravhandlinger ved NTNU (2021/271)
    Doctoral dissertation
  • Bazilchuk, Nancy Reney; Berge, Jørgen; Johnsen, Geir. (2021) Lysforurensning I Arktis kan ha ødelagt forskningsresultater. Gemini.no
    Popular scientific article
  • Cardwell, CR; Berge, Jørgen; Johnsen, Geir. (2021) Arctic voyage shines light on some cold, hard truths. The Herald, UK
    Popular scientific article
  • Ringvold, Halldis; Johnsen, Geir; Andersen, Tom. (2021) Studies on Echinodermata from the NE Atlantic Ocean - Spatial distribution and abundance of Asteroidea, including taxonomic and molecular studies on Crossaster and Henricia genera - Value-chain results, including test fishery, biology, market and nutritional analysis on Parastichopus tremulus (Holothuroidea) from the Norwegian coast. Doktoravhandlinger ved NTNU (2021-254)
    Doctoral dissertation
  • Snyder, Mike; Berge, Jørgen; Johnsen, Geir; Mckee, David. (2021) “Into the dark” documentary by Mike Snyder following Jørgen Berge (UiT), Geir Johnsen (NTNU) and David McKee (Uni Strathclyde) during Polar Night marine ecology work. .
    Film
  • Cohen, Jonathan H.; Last, Kim; Charpentier, Corie L.; Cottier, Finlo; Daase, Malin; Hobbs, Laura. (2021) Photophysiological cycles in Arctic krill are entrained by weak midday twilight during the Polar Night. PLoS Biology
    Academic article
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Pictures from an all-sky camera with hourly resolution from the light observatory at Ny-Ålesund, Svalbard, Norway (complete year 2019).
    Other product
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Pictures from an all-sky camera with hourly resolution from the light observatory at Ny-Ålesund, Svalbard, Norway (complete year 2017).
    Other product
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Pictures from an all-sky camera with hourly resolution from the light observatory at Ny-Ålesund, Svalbard, Norway (complete year 2020).
    Other product
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Pictures from an all-sky camera with hourly resolution from the light observatory at Ny-Ålesund, Svalbard, Norway (complete year 2018).
    Other product
  • Berge, Jørgen; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Johnsen, Geir. (2021) USSIMO spectroradiometer raw data time series (2018) measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway).
    Other product
  • Berge, Jørgen; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Johnsen, Geir. (2021) USSIMO spectroradiometer raw data time series (2019) measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway).
    Other product
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Time series (2020) of irradiance in the PAR (photosynthetically active radiation) region measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) derived from SLR camera.
    Other product
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Time series (2017) of irradiance in the PAR (photosynthetically active radiation) region measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) derived from SLR camera.
    Other product
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Photosynthetic active radiation (PAR) time series measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway).
    Other product
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Time series (2019) of irradiance in the PAR (photosynthetically active radiation) region measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) derived from SLR camera.
    Other product
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Time series (2018) of irradiance in the PAR (photosynthetically active radiation) region measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) derived from SLR camera.
    Other product
  • Berge, Jørgen; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Johnsen, Geir. (2021) Time series (2017) of irradiance in the PAR (photosynthetically active radiation) region measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) derived from an USSIMO spectroradiometer.
    Other product
  • Berge, Jørgen; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Johnsen, Geir. (2021) USSIMO spectroradiometer raw data time series (2017) measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) .
    Other product
  • Berge, Jørgen; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Johnsen, Geir. (2021) Time series (2020) of irradiance in the PAR (photosynthetically active radiation) region measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) derived from an USSIMO spectroradiometer.
    Other product
  • Berge, Jørgen; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Johnsen, Geir. (2021) Time series (2019) of irradiance in the PAR (photosynthetically active radiation) region measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) derived from an USSIMO spectroradiometer.
    Other product
  • Berge, Jørgen; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Johnsen, Geir. (2021) USSIMO spectroradiometer raw data time series (2020) measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway).
    Other product
  • Horni, K; Sørensen, Asgeir Johan; Johnsen, Geir; Ludvigsen, Martin. (2021) Internasjonalt forskningsmiljø dykker i Mjøsa etter at Oppland Arbeiderblad skrev om forurensning. Oppland arbeiderblad
    Popular scientific article

2020

  • Berge, Jørgen; Geoffroy, Maxime; Daase, Malin; Cottier, Finlo Robert; Priou, Pierre; Cohen, Jonathan H.. (2020) Artificial light during the polar night disrupts Arctic fish and zooplankton behavior down to 200 m depth. Communications Biology
    Academic article
  • Mogstad, Aksel Alstad; Ødegård, Øyvind; Nornes, Stein Melvær; Ludvigsen, Martin; Johnsen, Geir; Sørensen, Asgeir Johan. (2020) Mapping the Historical Shipwreck Figaro in the High Arctic Using Underwater Sensor-Carrying Robots. Remote Sensing
    Academic article
  • Berge, Jørgen; Johnsen, Geir. (2020) • Polar Night Exhibitions in Russia 2020. Kaliningrad – World Ocean Museum.
    Museum exhibition
  • Berge, Jørgen; Johnsen, Geir. (2020) Polar Night exhibition in Karelia (Petrozavodsk, Russia): 03.03 – 03.04.2020 . Polar Night exhibition, Karelia (Petrozavodsk, Russia). March-April 2020
    Museum exhibition
  • Gibbens, Sarah; Berge, Jørgen; Johnsen, Geir; Mckee, David. (2020) As the Arctic warms, light pollution may pose a new treat to marine life. . National Geographic
    Interview Journal
  • Berge, Jørgen; Johnsen, Geir; Cohen, Jonathan H.. (2020) Polar night marine ecology - life and light in the dead of night. Springer Advances in Polar Ecology (0)
    Academic anthology/Conference proceedings
  • Berge, Jørgen; Johnsen, Geir; Cohen, Jonathan H.. (2020) Introduction. Springer
    Introduction
  • Johnsen, Geir; Leu, Eva; Gradinger, Rolf. (2020) Marine Micro- and Macroalgae in the Polar Night. Springer
    Academic chapter/article/Conference paper
  • Ramirez-Llodra, Eva; Hilário, Ana; Paulsen, Emil; Costa, Carolina; Bakken, Torkild; Johnsen, Geir. (2020) Benthic Communities on the Mohn’s Treasure Mound: Implications for Management of Seabed Mining in the Arctic Mid-Ocean Ridge. Frontiers in Marine Science
    Academic article
  • Cohen, Jonathan H.; Berge, Jørgen; Moline, Mark A.; Johnsen, Geir; Zolich, Artur Piotr. (2020) Light in the Polar Night. Springer
    Academic chapter/article/Conference paper
  • Berge, Jørgen; Johnsen, Geir. (2020) Life and Light at the Dead of Night. Springer
    Academic chapter/article/Conference paper
  • Johnsen, Geir; Mogstad, Aksel Alstad; Berge, Jørgen; Cohen, Jonathan H.. (2020) Operative Habitat Mapping and Monitoring in the Polar Night. Springer
    Academic chapter/article/Conference paper
  • Fragoso, Glaucia Moreira; Johnsen, Geir; Chauton, Matilde Skogen; Cottier, Finlo Robert; Ellingsen, Ingrid H.. (2020) Phytoplankton community succession and dynamics using optical approaches. Continental Shelf Research
    Academic article
  • Saad, Aya; Stahl, Annette; Våge, Andreas; Davies, Emlyn John; Nordam, Tor; Aberle-Malzahn, Nicole. (2020) Advancing Ocean Observation with an AI-driven Mobile Robotic Explorer. Oceanography
    Academic article

2019

  • Graham, Lisa Kristine Hernandez; Johnsen, Geir; Christensen-Dalsgaard, Signe. (2019) A pilot study assessing drones for mapping and monitoring of European shags. Institutt for biologi, NTNU
    Masters thesis
  • Mogstad, Aksel Alstad; Johnsen, Geir; Ludvigsen, Martin. (2019) Shallow-Water Habitat Mapping using Underwater Hyperspectral Imaging from an Unmanned Surface Vehicle: A Pilot Study. Remote Sensing
    Academic article
  • Pavlov, Alexey K.; Leu, Eva; Hanelt, Dieter; Bartsch, Inka; Karsten, Ulf; Hudson, Stephen. (2019) The Underwater Light Climate in Kongsfjorden and Its Ecological Implications. Springer
    Academic chapter/article/Conference paper
  • Bazilchuk, Nancy Reney; Fossum, Trygve Olav; Fragoso, Glaucia Moreira; Ludvigsen, Martin; Johnsen, Geir. (2019) Smart undervannsrobot leter etter plankton. Av N Bazilchuk. Forskning.no. Angående NTNU Entice prosjekt publisert i Science Robotics. Forskning.no
    Popular scientific article
  • Fossum, Trygve Olav; Fragoso, Glaucia Moreira; Davies, Emlyn John; Ullgren, Jenny; Mendes, Renato; Johnsen, Geir. (2019) Toward adaptive robotic sampling of phytoplankton in the coastal ocean. Science robotics
    Academic article
  • Fragoso, Glaucia Moreira; Poulton, Alex James; Pratt, Nicola Jane; Johnsen, Geir; Purdie, Duncan Alastair. (2019) Trait-based analysis of subpolar North Atlantic phytoplankton and plastidic ciliate communities using automated flow cytometer. Limnology and Oceanography
    Academic article
  • Kleiven, Wanda; Johnsen, Geir; Ardelan, Murat Van. (2019) Sea surface microlayer and elemental composition in phaeo-, chloro-, and rhodophytes in winter and spring. Journal of Phycology
    Academic article
  • Kauko, Hanna Maria; Pavlov, Alexey; Johnsen, Geir; Granskog, Mats; Peeken, Ilka; Assmy, Philipp. (2019) Photoacclimation state of an Arctic underice phytoplankton bloom. Journal of Geophysical Research (JGR): Oceans
    Academic article
  • Fragoso, Glaucia Moreira; Davies, Emlyn John; Ellingsen, Ingrid H.; Chauton, Matilde Skogen; Fossum, Trygve Olav; Ludvigsen, Martin. (2019) Physical controls on phytoplankton size structure, photophysiology and suspended particles in a Norwegian biological hotspot. Progress in Oceanography
    Academic article

2018

  • Liefmann, Stephanie; Järnegren, Johanna; Johnsen, Geir; Murray, Fiona. (2018) Eco-physiological responses of cold-water soft corals to anthropogenic sedimentation and particle shape. Journal of Experimental Marine Biology and Ecology
    Academic article
  • Johnsen, Geir; Norli, Marit; Moline, Mark A.; Robbins, Ian; Quillfeldt, Cecilie von; Sørensen, Kai. (2018) The advective origin of an under-ice spring bloom in the Arctic Ocean using multiple observational platforms. Polar Biology
    Academic article
  • Berge, Jørgen; Johnsen, Geir. (2018) Lysforurensning truer livet i Arktis. Aftenposten Viten
    Feature article
  • Ludvigsen, Martin; Berge, Jørgen; Geoffroy, Maxime; Cohen, Jonathan H.; De La Torre, Pedro R.; Nornes, Stein Melvær. (2018) Use of an autonomous surface vehicle reveals small-scale diel vertical migrations of zooplankton and susceptibility to light pollution under low solar irradiance. Science Advances
    Academic article
  • Fragoso, Glaucia Moreira; Poulton, Alex J.; Yashayaev, Igor M.; Head, Erica J.H.; Johnsen, Geir; Purdie, Duncan A.. (2018) Diatom biogeography from the Labrador Sea revealed through a trait-based approach. Frontiers in Marine Science
    Academic article
  • Dumke, Ines; Ludvigsen, Martin; Ellefmo, Steinar Løve; Søreide, Fredrik; Johnsen, Geir; Murton, Bramley J.. (2018) Underwater Hyperspectral Imaging Using a Stationary Platform in the Trans-Atlantic Geotraverse Hydrothermal Field. IEEE Transactions on Geoscience and Remote Sensing
    Academic article
  • Ødegård, Øyvind; Sørensen, Asgeir Johan; Johnsen, Geir; Ludvigsen, Martin; Hansen, Roy Edgar; Maarleveld, Thijs. (2018) Towards Autonomous Operations and Systems in Marine Archaeology. Doktoravhandlinger ved NTNU (IMT-12)
    Doctoral dissertation
  • Geoffroy, Maxime; Berge, Jørgen; Majaneva, Sanna Kristiina; Johnsen, Geir; Langbehn, Tom; Cottier, Finlo Robert. (2018) Increased occurrence of the jellyfish Periphylla periphylla in the European high Arctic. Polar Biology
    Short communication
  • Nornes, Stein Melvær; Sørensen, Asgeir Johan; Ludvigsen, Martin; Johnsen, Geir; Schjølberg, Ingrid; Ånonsen, Kjetil Bergh. (2018) Guidance and Control of Marine Robotics for Ocean Mapping and Monitoring. Doktoravhandlinger ved NTNU (2018:202)
    Doctoral dissertation
  • Kauko, Hanna Maria; Olsen, Lasse Mork; Duarte, Pedro; Peeken, Ilka; Granskog, Mats A.; Johnsen, Geir. (2018) Algal colonization of young arctic sea ice in spring. Frontiers in Marine Science
    Academic article
  • Dumke, Ines; Purser, Autun; Marcon, Yann; Nornes, Stein Melvær; Johnsen, Geir; Ludvigsen, Martin. (2018) Underwater hyperspectral imaging as an in situ taxonomic tool for deep-sea megafauna. Scientific Reports
    Academic article
  • Fossum, Trygve Olav; Eidsvik, Jo; Ellingsen, Ingrid H.; Alver, Morten; Fragoso, Glaucia Moreira; Johnsen, Geir. (2018) Information-driven robotic sampling in the coastal ocean. Journal of Field Robotics (JFR)
    Academic article
  • Ødegård, Øyvind; Mogstad, Aksel Alstad; Johnsen, Geir; Sørensen, Asgeir Johan; Ludvigsen, Martin. (2018) Underwater hyperspectral imaging: a new tool for marine archaeology. Applied Optics
    Academic article
  • Berge, Jørgen; Johnsen, Geir. (2018) Lysforurensning - enda en kilde til bekymring. Svalbardposten
    Feature article
  • Dumke, Ines; Nornes, Stein Melvær; Purser, Autun; Marcon, Yann; Ludvigsen, Martin; Ellefmo, Steinar Løve. (2018) First hyperspectral imaging survey of the deep seafloor: High-resolution mapping of manganese nodules. Remote Sensing of Environment
    Academic article
  • Gabrielsen, Tove M.; Johnsen, Geir. (2018) Skogen på Svalbard. Svalbardposten
    Popular scientific article
  • Zolich, Artur Piotr; De La Torre, Pedro R.; Rodwell, Shane; Geoffroy, Maxime; Johnsen, Geir; Berge, Jørgen. (2018) An ice-tethered buoy for fish and plankton research. IEEE conference proceedings
    Academic chapter/article/Conference paper
  • Strømsholm, Jørgen; Johnsen, Geir; Ludvigsen, Martin. (2018) Eyes beneath the surface - using a miniROV to reveal habitat and dietary choices of the European shag. NTNU MSc thesis
    Masters thesis
  • Kauko, Hanna Maria; Johnsen, Geir; Assmy, Phillipp. (2018) Light response and acclimation of macroalgae in a changing Arctic. Doktoravhandlinger ved NTNU (2018)
    Doctoral dissertation
  • Fjærtoft, Kaja Lønne; Bakken, Torkild; Johnsen, Geir; Ludvigsen, Martin. (2018) Macroalgal detritus: Physical variables and impacts on the benthic macrofaunal community. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Masters thesis

2017

  • Berge, Jørgen; Johnsen, Geir. (2017) Kunnskapshull om livet i Arktis i mørketiden. Aftenposten Viten
    Feature article
  • Paulsen, Emil; Bakken, Torkild; Ramirez-Llodra, Eva; Johnsen, Geir. (2017) Community structure and biodiversity of the benthic megafauna at the inactive hydrothermal site Mohn's Treasure, on the Mohn's Ridge, Arctic Mid-Ocean Ridge (AMOR) . Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Masters thesis
  • Alvsvåg, Dora Marie; Johnsen, Geir; Bakken, Torkild; Ludvigsen, Martin; Berge, Jørgen. (2017) Mapping of a seagrass habitat in Hopavågen, Sør-Trøndelag, with the use of an Autonomous Surface Vehicle combined with optical techniques. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Masters thesis
  • Berge, Jørgen; Johnsen, Geir. (2017) Superkommunisten. Svalbardposten
    Feature article
  • Berge, Jørgen; Johnsen, Geir. (2017) Om bambus, spøkelseskreps og et Arktis i endring. Svalbardposten
    Feature article
  • Assmy, Philipp; Fernández-Méndez, Mar; Duarte, Pedro; Meyer, Amelie; Randelhoff, Achim; Mundy, Christopher John. (2017) Leads in Arctic pack ice enable early phytoplankton blooms below snow-covered sea ic. Scientific Reports
    Academic article
  • Mogstad, Aksel Alstad; Johnsen, Geir. (2017) Spectral characteristics of coralline algae: a multi-instrumental approach, with emphasis on underwater hyperspectral imaging. Applied Optics
    Academic article
  • Kamilla, Sporsheim; Sporsheim, Kamilla; Johnsen, Geir; Reitan, Kjell Inge; Evertsen, Antii Jussi. (2017) Astaxanthin as a biomarker for fish feed loading in the marine ecosystem. NTNU, Trondheim
    Masters thesis
  • Otterlei, Inger; Johnsen, Geir; Sørensen, Asgeir Johan; Ludvigsen, Martin; Hareide, Nils Roar; Christensen-Dalsgaard, Signe. (2017) 300 000 sjøfugl er forsvunnet fra Runde. Sunnmørsposten
    Interview Journal
  • Berge, Jørgen; Johnsen, Geir; Tandberg, Anne helene. (2017) Polar night - Life and light in the dead of night. Russian Science Week - Lomonosov Moscow State University
    Museum exhibition
  • Johnsen, Geir; Sandbu, Marthe; Assmy, Philipp. (2017) High Arctic Sea-Ice Algae: The Use of Rapid Light Curves to Assess Photosynthetic Performance of Different Ice-Algal Communities. Master science NTNU
    Masters thesis
  • Kjeken, John; Johnsen, Geir; Ludvigsen, Martin; Thorsnes, Terje; Lågstad, Petter Arthur. (2017) The growth of benthic organisms in a dumping ground for military bombs and munitions. NTNU, Trondheim
    Masters thesis
  • Mynors, Julie; Johnsen, Geir; Wernand, Marcel; Volent, Zsolt. (2017) Ocean Colour and Phytoplankton Dynamics - An examination of the Forel-Ule scale in a modern context. NTNU Trondheim
    Masters thesis
  • Johnsen, Geir; Christiansen, Hanne H; Ravolainen, Virve; Reymert, Per Kyrre; Jenssen, Eva Therese; Arlov, Thor Bjørn. (2017) Utfordrende natur og sikkerhet på Svalbard. Svalbardposten
    Feature article
  • Kauko, Hanna Maria; Taskjelle, Torbjørn; Assmy, Philipp; Pavlov, Alexey K.; Mundy, C.J.; Duarte, Pedro. (2017) Windows in Arctic sea ice: light transmission and ice algae in a refrozen lead. Journal of Geophysical Research (JGR): Biogeosciences
    Academic article
  • Andersson, Ingvild Henriette Kristin; Johnsen, Geir; Bakken, Torkild; Ludvigsen, Martin. (2017) Bio-optical diversity on cold water coral habitats. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Masters thesis
  • Ostaszewska, Kaja; Balazy, Piotr; Berge, Jørgen; Johnsen, Geir; Staven, Robert. (2017) Seabirds during Arctic Polar Night: underwater observations from Svalbard archipelago, Norway. Waterbirds (De Leon Springs, Fla.)
    Academic article

2016

  • Johnsen, Geir. (2016) Yrende liv i Isfjorden. Svalbardposten
    Popular scientific article
  • Bjørgan, Espen Halvorsen; Johnsen, Geir; Kjeken, Jon; Ludvigsen, Martin. (2016) Fant buss på 600 m dybde. Adresseavisen
    Popular scientific article
  • Aarskog, Karine Nigar; Berge, Jørgen; Johnsen, Geir; Sørensen, Asgeir Johan. (2016) Et stort løft for arktisk forskning (NTNU & UiT). Universitetet i Tromsø
    Article in business/trade/industry journal
  • Berge, Jørgen; Falk-Petersen, Stig; Renaud, Paul E.; Daase, Malin; Geoffroy, Maxime; Johnsen, Geir. (2016) En reise mot Ultima Thule. Svalbardposten
    Popular scientific article
  • Lervik, Frank; Johnsen, Geir; Ludvigsen, Martin; Kjeken, John. (2016) Det ligger flere busser der. Adresseavisen
    Popular scientific article
  • Bazilchuk, Nancy Reney; Johnsen, Geir; Berge, Jørgen; Ludvigsen, Martin; Sørensen, Asgeir Johan; Ødegård, Øyvind. (2016) Mørkets fyrster, varulver og Indiana Jones. Gemini
    Popular scientific article
  • Haudemann-Andersen, Jørn; Lystad, M S; Johnsen, Geir; Sørensen, Asgeir Johan; Berge, Jørgen. (2016) Blå lys i det kalde dyp. NRK Trøndelag, Nyheter
    Popular scientific article
  • Haugstad, Tor; Erdal, Ivar; Johnsen, Geir; Sørensen, Asgeir Johan; Fjærvik, Nils. (2016) Gründerne mener dette kameraet kan bli det nye ekkoloddet – Ecotone er kandidat til TU Tech Award. Teknisk Ukeblad
    Popular scientific article
  • Berge, Jørgen; Geoffroy, Maxime; Johnsen, Geir; Cottier, Finlo Robert; Bluhm, Bodil; Vogedes, Daniel Ludwig. (2016) Ice-tethered observational platforms in the Arctic Ocean pack ice. IFAC-PapersOnLine
    Academic article
  • Cronin, Heather; Cohen, Jonathan H.; Berge, Jørgen; Johnsen, Geir; Moline, Mark A.. (2016) Bioluminescence as an ecological factor during high Arctic polar night. Scientific Reports
    Academic article
  • Berge, Jørgen; Johnsen, Geir; Ødegård, Øyvind. (2016) Mark spiser opp vrak på havbunnen. Fiskaren
    Popular scientific article
  • Kokkegård, Hanne; Johnsen, Geir; Ludvigsen, Martin; Torre, Pedro De La. (2016) Vitenskab - Bomber fra 2 verdenskrig danner koralrev på 600 m dybde. Danmarks radio
    Popular scientific article
  • Berge, Jørgen; Johnsen, Geir. (2016) Mørkets fyrster med påskrudd lys. Svalbardposten
    Popular scientific article
  • Bazilchuk, Nancy Reney; Leite, Stein Roar; Johnsen, Geir; Kjeken, John; Sørensen, Asgeir Johan; Ludvigsen, Martin. (2016) Bomber og buss på havbunnen. Gemini
    Popular scientific article
  • Haugstad, Tormod; Erdal, Ivar; Johnsen, Geir. (2016) Kameraet deres «kan bli det nye ekkoloddet». Nå er det norske selskapet i ferd med å lykkes. Teknisk Ukeblad
    Interview Journal
  • Berge, Jørgen; Ødegård, Øyvind; Johnsen, Geir. (2016) Opp fra polarnattens mørke. Aftenposten Viten
    Feature article
  • Gätzschmann, Per; Hårsaker, Karstein; Johnsen, Geir; Leite, Stein Roar; Pedersen, Solbjørg; Sørumgård, Marit. (2016) Nye oppdagelser i polarnatta - video. Polarnatt
    Museum exhibition
  • Donahue, Michelle; Berge, Jørgen; Johnsen, Geir; Ødegård, Øyvind. (2016) The age of humans - living in the anthropocene - "Termites of the sea" found munching wood near Arctic shipwrecks. Smithsonian
    Popular scientific article
  • Johnsen, Geir; Ludvigsen, Martin; Sørensen, Asgeir Johan; Aas, Lars Martin Sandvik. (2016) The use of underwater hyperspectral imaging deployed on remotely operated vehicle – methods and applications. IFAC-PapersOnLine
    Academic article
  • Håpnes, Sverre Julian; Johnsen, Geir; Ludvigsen, Martin; Lågstad, Petter Arthur. (2016) Mapping of demersal fish and benthos by AUV equipped with optical and acoustic imagers at 600 m depth in Trondheimsfjorden. NTNU MSc
    Masters thesis
  • Johnsen, Geir; Berge, Jørgen; Sørensen, Asgeir Johan; Sørumgård, Marit; Sandbakk, Elin; Johnsen, Tobias Kvendseth. (2016) Polarnatt/Polar Night - ny utstilling med nyheter fra 2015-2016. Polarnattsutstilling ved Vitenskapsmuseet NTNU
    Museum exhibition
  • Bondø, Tor-Hartvig; Johnsen, Geir; Berge, Jørgen. (2016) Fant yrende liv i polarnatta. VG : Verdens gang
    Popular scientific article
  • Kintisch, Eli; Berge, Jørgen; Last, Kim; Cohen, Jonathan; Johnsen, Geir. (2016) Voyage into darkness . Science
    Interview Journal
  • Bazilchuk, Nancy Reney; Johnsen, Geir; Berge, Jørgen; Sørensen, Asgeir Johan; Ødegård, Øyvind. (2016) Dark lords, werewolves and Indiana Jones in the polar night. Gemini (English edition)
    Interview Journal
  • Berge, Jørgen; Johnsen, Geir; Ødegård, Øyvind. (2016) Kinderegg i polarnatten. Svalbardposten
    Feature article
  • Krüger, Frida Jørstad; Johnsen, Geir; Kjeken, John; Ludvigsen, Martin. (2016) Gammel buss ble korallrev. NRK Viten
    Popular scientific article
  • Liefmann, Stephanie; Johnsen, Geir; Järnegren, Johanna. (2016) Eco-physiological responses of cold-water corals to anthropogenic sedimentation and particle shape. NTNU Mastergrad
    Masters thesis
  • Berge, Jørgen; Renaud, Paul E.; Johnsen, Geir; Darnis, Gerald; Geoffroy, Maxime; Daase, Malin. (2016) I grenselandet (mellom Tull og Thule). Svalbardposten
    Popular scientific article
  • Berge, Jørgen; Ødegård, Øyvind; Johnsen, Geir. (2016) A bitter-sweet symphony. Svalbardposten
    Feature article
  • Berge, Jørgen; Johnsen, Geir; Ludvigsen, Martin; Cohen, Jonathan. (2016) Design for latskap - men med store muligheter. Svalbardposten
    Feature article
  • Førde, Henny; Forbord, Silje; Handå, Aleksander; Fossberg, Julia; Arff, Johanne; Johnsen, Geir. (2016) Development of bryozoan fouling on cultivated kelp (Saccharina latissima) in Norway. Journal of Applied Phycology
    Academic article
  • Jakobsen, June; Johnsen, Geir; Bakken, Torkild; Ludvigsen, Martin; Karlsen, Svein. (2016) The Tautra Cold-Water Coral Reef - Mapping and describing the biodiversity of a cold-water coral reef ecosystem in the Trondheimsfjord by use of multi-beam echo sounding and video mounted on a remotely operated vehicle. NTNU
    Masters thesis

2015

  • Cohen, Jonathan H.; Berge, Jørgen; Moline, Mark A.; Sørensen, Asgeir Johan; Last, Kim; Falk-Petersen, Stig. (2015) Is ambient light during the high Arctic polar night sufficient to act as a visual cue for zooplankton?. PLOS ONE
    Academic article
  • Berge, Jørgen; Renaud, Paul; Darnis, Gérald; Cottier, Finlo; Last, Kim; Gabrielsen, Tove M.. (2015) In the dark: a review of ecosystem processes during the Arctic polar night. Progress in Oceanography
    Academic article
  • Berge, Jørgen; Daase, Malin; Renaud, Paul; Ambrose, William G. Jr.; Darnis, Gérald; Last, Kim S. (2015) Unexpected levels of biological activity during the polar night offer new perspectives on a warming Arctic. Current Biology
    Academic article
  • Tandberg, Anne Helene S.; Berge, Jørgen; Johnsen, Geir; Aarekol, Lena. (2015) POLARNATT - liv og lyst i mulm og mørke. Polarnatt - liv og lyst i mulm og mørke
    Museum exhibition
  • Berge, Jørgen; Johnsen, Geir. (2015) Polarnatt - Liv og lys i mulm og mørke Polar night - life and light in the dead of night. Utstilling på Polarmuseet i Tromsø
    Museum exhibition
  • Aarekol, Lena; Johnsen, Geir; Berge, Jørgen. (2015) Polarnatt. Liv og lys i mulm og mørke Polarnighth. Life and death in dead of night. Utstilling
    Museum exhibition
  • Nilssen, Ingunn; Dos Santos, Francisco; Coutinho, Ricardo; Gomes, Natalia; Cabral, Marcelo M.; Eide, Ingvar. (2015) Assessing the potential impact of water-based drill cuttings on deep water calcareous red algae using species specific impact categories and measured oceanographic and discharge data. Marine Environmental Research
    Academic article
  • Berge, Jørgen; Johnsen, Geir; Sørensen, Asgeir Johan; Nilssen, Ingunn. (2015) Enabling technology for Arctic research. Pan European Networks: Science and Techology Magazine
    Academic literature review
  • Nilssen, Ingunn; Santos dos, Francisco; Coutinho, Ricardo; Gomes, Natalia; Cabral Montenegro, Marcelo; Eide, Ingvar. (2015) Assessing the potential impact of water-based drill cuttings on deep-water calcareous red algae using species specific impact categories and measured oceanographic and discharge data. Marine Environmental Research
    Academic article
  • Rodriguez, Francisco; Garrido, J.L.; Sabrino, C; Johnsen, Geir; Riobo, P; Franco, J. (2015) Divinyl chlorophyll a in the marine eukaryotic protist Alexandrium ostenfeldii (Dinophyceae). Environmental Microbiology
    Academic article
  • Ludvigsen, Martin; Thorsnes, Terje; Hansen, Roy Edgar; Sørensen, Asgeir Johan; Johnsen, Geir; Lågstad, Petter Arthur. (2015) Underwater vehicles for environmental management in coastal areas. IEEE conference proceedings
    Academic chapter/article/Conference paper
  • Nilssen, Ingunn; Ødegård, Øyvind; Sørensen, Asgeir Johan; Johnsen, Geir; Moline, Mark A.; Berge, Jørgen. (2015) Integrated environmental mapping and monitoring, a methodological approach to optimise knowledge gathering and sampling strategy. Marine Pollution Bulletin
    Academic article
  • Berge, Jørgen; Johnsen, Geir; Aarekol, Lena. (2015) Life and light in the dead of night. Museumsutstilling
    Museum exhibition

2014

  • Hovland, Erlend Kjeldsberg; Hancke, Kasper; Alver, Morten; Drinkwater, Kennneth F.; Høkedal, Jo; Johnsen, Geir. (2014) Optical impact of an Emiliania huxleyi bloom in the frontal region of the Barents Sea. Journal of Marine Systems
    Academic article
  • Hancke, Kasper; Hovland, Erlend Kjeldsberg; Volent, Zsolt; Pettersen, Ragnhild; Johnsen, Geir; Moline, Mark A.. (2014) Optical properties of CDOM across the Polar Front in the Barents Sea: Origin, distribution and significance. Journal of Marine Systems
    Academic article
  • Kjerstad, Ingrid; Johnsen, Geir; Sørensen, Asgeir Johan; Bakken, Torkild. (2014) Underwater Imaging and the effect of Inherent Optical Properties on image quality. NTNU
    Masters thesis
  • Hatlebakk, Maja; Johnsen, Geir; Søreide, Janne. (2014) Effect of lipids and fatty acid composition on success of reproduction in Calanus glacialis. NTNU
    Masters thesis
  • Valle, Kristin Collier; Johnsen, Geir; Bones, Atle M. (2014) Photoacclimation mechanisms and light responses in marine micro- and macroalgae. NTNU
    Doctoral dissertation
  • Hallerud, Charlotte; Johnsen, Geir; Aamot, Inga. (2014) Pigment composition of macroalgae from a Norwegian kelp forest. NTNU
    Masters thesis
  • Lund, Lene; Johnsen, Geir; Bakken, Torkild; Gabrielsen, Tove. (2014) Morphological diversity in Laminaria digitata - different species or different phenotypes?. Norwegian University of Science and Technology, Department of Biology
    Masters thesis
  • Førde, Henny; Reitan, Kjell Inge; Johnsen, Geir. (2014) Development of bryozoan fouling on cultivated kelp (Saccharina latissima) in Norway. NTNU
    Masters thesis
  • Cohen, Jonathan; Cronin, Heather; Moline, Mark A.; Berge, Jørgen; Johnsen, Geir; Sørensen, Asgeir Johan. (2014) Are krill eyes useful in the high Arctic polar night?. Ocean Optics
    Abstract
  • Hansen, Ingrid; Pettersen, Ragnhild; Beuchel, Frank; Cochrane, Sabine; Frantzen, marianne; Ekehaug, Stefan. (2014) Underwater hyperspectral imaging (UHI) for environmental mapping and monitoring of seabed habitats. Ocean Optics
    Abstract
  • Aamot, Inga; Pokrzywinski, Kaytee; Johnsen, Geir; Berge, Jørgen; Sørensen, Asgeir Johan. (2014) Light Climate and Status of the Photosynthetic Machinery in Macroalgae in the Polar Night. Ocean Optics
    Abstract
  • Nornes, Stein Melvær; Candeloro, Mauro; Ødegård, Øyvind; Johnsen, Geir; Sørensen, Asgeir Johan. (2014) Photomosaic camera as simultaneous data collector and navigation aid on unmanned underwater vehicles. Ocean Optics
    Abstract
  • Johnsen, Geir; Ekehaug, Stefan; Hansen, Ingrid; Sørensen, Asgeir Johan. (2014) The use of underwater hyperspectral imaging deployed on remotely operated vehicles to identify, map and monitor bio-geo-chemical objects of interest. Ocean Optics
    Abstract
  • Nilssen, Ingunn; Ødegård, Øyvind; Johnsen, Geir; Sørensen, Asgeir Johan; Berge, Jørgen; Nornes, Stein Melvær. (2014) Integrated environmental monitoring; a methodological approach to optimise knowledge gathering and sampling strategy. Ocean Optics
    Abstract
  • Berge, Jørgen; Cottier, Finlo; Varpe, Øystein; Renaud, Paul; Falk-Petersen, Stig; Kwasniewski, Sawomir. (2014) Arctic complexity: A case study on diel vertical migration of zooplankton. Journal of Plankton Research
    Academic article
  • Kvernvik, Ane Cecilie; Johnsen, Geir; Aamot, Inga. (2014) How lamina age influence photosynthetic response to light variations in Saccharina latissima. NTNU
    Masters thesis
  • Kleiven, Wanda; Johnsen, Geir; Ardelan, Murat Van. (2014) Elemental composition in various marine brown, green and red macro algae with respect to season and tissue age. NTNU
    Masters thesis
  • Johnsen, Geir; Candeloro, Mauro; Berge, Jørgen; Moline, Mark A.. (2014) Glowing in the dark: Discriminating patterns of bioluminescence from different taxa during the Arctic polar night. Polar Biology
    Academic article
  • Ødegård, Øyvind; Ludvigsen, Martin; Johnsen, Geir; Sørensen, Asgeir Johan; Ekehaug, Stefan; Dukan, Fredrik. (2014) Managing data from multiple sensors in an interdisciplinary research cruise. Amsterdam University Press
    Academic chapter/article/Conference paper
  • Johnsen, Geir; Candeloro, Mauro; Berge, Jørgen; Moline, Mark A.. (2014) Erratum to: Glowing in the dark: discriminating patterns of bioluminescence from different taxa during the Arctic polar night. Polar Biology
    Errata
  • Valle, Kristin Collier; Nymark, Marianne; Aamot, Inga; Hancke, Kasper; Winge, Per; Andresen, Kjersti. (2014) System responses to equal doses of photosynthetically usable radiation of blue, green, and red light in the marine diatom Phaeodactylum tricornutum. PLOS ONE
    Academic article
  • Pettersen, Ragnhild; Johnsen, Geir; Bruheim, Per; Andreassen, Trygve. (2014) Development of hyperspectral imaging as a bio-optical taxonomic tool for pigmented marine organisms. Organisms Diversity & Evolution
    Academic article
  • Ludvigsen, Martin; Johnsen, Geir; Sørensen, Asgeir Johan; Lågstad, Petter Arthur; Ødegård, Øyvind. (2014) Scientific Operations Combining ROV and AUV in the Trondheim Fjord. Marine Technology Society journal
    Academic article
  • Eldevik, Tor; Reigstad, Marit; Falck, Eva; Gerland, Sebastian; Jentoft, Sissel; Johnsen, Geir. (2014) Arven efter Nansen. Forskningsplan for det sentrale og nordlige Barentshavet. UiT Norges arktiske universitet UiT Norges arktiske universitet
    Report
  • Bones, Atle M.; Johnsen, Geir; Brembu, Tore; Valle, Kristin Collier. (2014) Photoacclimation mechanisms and light responses in marine micro- and macroalgae. Doktoravhandlinger ved NTNU (74)
    Doctoral dissertation

2013

  • Hovland, Erlend Kjeldsberg; Dierssen, Heidi; Ferreira, Ana Sofia; Johnsen, Geir. (2013) Dynamics regulating major trends in Barents Sea temperatures and subsequent effect on remotely sensed particulate inorganic carbon. Marine Ecology Progress Series
    Academic article
  • Nymark, Marianne; Valle, Kristin Collier; Hancke, Kasper; Winge, Per; Andresen, Kjersti; Johnsen, Geir. (2013) Molecular and photosynthetic responses to prolonged darkness and subsequent acclimation to re-illumination in the diatom Phaeodactylum tricornutum. PLOS ONE
    Academic article
  • Berge, Jørgen; Johnsen, Geir; Falk-Pettersen, Stig. (2013) Mørkets hemmeligheter. Svalbardposten
    Popular scientific article
  • Båtnes, Anna Solvang; Miljeteig, Cecilie; Berge, Jørgen; Greenacre, Michael; Johnsen, Geir. (2013) Quantifying the light sensitivity of Calanus spp. during the polar night: potential for orchestrated migrations conducted by ambient light from the sun, moon, or aurora borealis. Polar Biology
    Academic article
  • Ingrid, Hansen; Johnsen, Geir; Sørensen, Asgeir Johan. (2013) Optical Mapping of Cold-water Corals in Trondheimsfjorden and Svalbard. NTNU
    Masters thesis
  • Johnsen, Geir; Sørensen, Asgeir Johan; Ekehaug, Stefan. (2013) The use of side scan and synthetic aperture sonar mounted on autonomous underwater vehicles for biological habitat mapping. MSc Thesis (2013)
    Masters thesis
  • Pettersen, Ragnhild; Johnsen, Geir. (2013) Identification of marine organisms using Chemotaxonomy and Hyperspectral imaging. Doktoravhandlinger ved NTNU (292)
    Doctoral dissertation
  • Båtnes, Anna Solvang; Johnsen, Geir. (2013) Light in the dark – the role of irradiance in the high Arctic marine ecosystem during polar night. Doktoravhandlinger ved NTNU (151)
    Doctoral dissertation
  • Johnsen, Geir; Volent, Zsolt; Dierssen, Heidi; Pettersen, Ragnhild; Ardelan, Murat Van; Søreide, Fredrik. (2013) Underwater hyperspectral imagery to create biogeochemical maps of seafloor properties. Woodhead Publishing Limited
    Academic chapter/article/Conference paper
  • Ludvigsen, Martin; Johnsen, Geir; Lågstad, Petter Arthur; Sørensen, Asgeir Johan; Ødegård, Øyvind. (2013) Scientific operations combining ROV and AUV in the Trondheim Fjord. IEEE conference proceedings
    Academic chapter/article/Conference paper
  • Bones, Atle M.; Johnsen, Geir; Brembu, Tore; Nymark, Marianne. (2013) Light responses in the marine diatom Phaeodactylum tricornutum. Doktoravhandlinger ved NTNU (378)
    Doctoral dissertation

2012

  • Roy, Suzanne; Llewellyn, Carole; Egeland, Einar Skarstad; Johnsen, Geir. (2012) Phytoplankton Pigments: Characterization, Chemotaxonomy and Applications in Oceanography. Cambridge University Press Cambridge Environmental Chemistry Series (2012)
    Academic anthology/Conference proceedings
  • Elde, Anette; Pettersen, Ragnhild; Bruheim, Per; Järnegren, Johanna; Johnsen, Geir. (2012) Pigmentation and Spectral Absorbance Signatures in Deep-Water Corals from the Trondheimsfjord, Norway. Marine Drugs
    Academic article
  • Berge, Jørgen; Båtnes, Anna Solvang; Johnsen, Geir; Blackwell, Susan; Moline, Mark A.. (2012) Bioluminescence in the high Arctic during the polar night. Marine Biology
    Academic article
  • Bjørdalsbakke, Lise Kristin; Johnsen, Geir; Bakken, Torkild; Berge, Jørgen. (2012) Population structure, parasitism and prey preference in Sclerocrangon boreas and S. ferox, Svalbard. NTNU
    Thesis at a second degree level
  • Fremstedal, Ane Sofia Viset; Bruheim, Per; Sletta, Håvard; Johnsen, Geir. (2012) Utvikling og optimalisering av protokoll for massespektrometrisk metabolsk profilering av adherente humane celler. NTNU Master theses
    Masters thesis
  • Belseth, Elen; Johnsen, Geir; Berge, Jørgen. (2012) Eco-physiology of the Arctic kelp Laminaria solidungula. NTNU Master thesis
    Masters thesis
  • Gabrielsen, Tove M; Quillfeldt, Cecilie von; Johnsen, Geir; Berge, Jørgen. (2012) Varm vinter, sen vår i fjorden. Svalbardposten
    Reader opinion piece
  • Hovland, Erlend Kjeldsberg; Johnsen, Geir; Sakshaug, Egil; Folkestad, Are. (2012) Bio-optics and ecology in Emiliania huxleyi blooms: Field and remote sensing studies in Norwegian water. NTNU
    Doctoral dissertation

2011

  • Pettersen, Ragnhild; Johnsen, Geir; Berge, Jørgen; Hovland, Erlend Kjeldsberg. (2011) Phytoplankton chemotaxonomy in waters around the Svalbard archipelago reveals high amounts of Chl b and presence of gyroxanthin-diester. Polar Biology
    Academic article
  • Jouenne, Fabien; Eikrem, Wenche; Le Gall, F; Marie, Dominique; Johnsen, Geir; Vaulot, Daniel. (2011) Prasinoderma singularis sp. nov. (Prasinophyceae, Chlorophyta), a Solitary Coccoid Prasinophyte from the South-East Pacific Ocean. Protist
    Academic article
  • Roy, Suzanne; Llewellyn, Carole; Egeland, Einar Skarstad; Johnsen, Geir. (2011) Phytoplankton pigments : characterization, chemotaxonomy and applications in oceanography. Cambridge University Press Cambridge Environmental Chemistry Series (2011)
    Academic anthology/Conference proceedings
  • Thoen, Hanne Halkinrud; Johnsen, Geir; Berge, Jørgen. (2011) Pigmentation and spectral absorbance in the deep-sea arctic amphipods Eurythenes gryllus and Anonyx sp. Polar Biology
    Academic article
  • Volent, Zsolt; Johnsen, Geir; Hovland, Erlend Kjeldsberg; Folkestad, Are; Olsen, Lasse Mork; Tangen, Karl. (2011) Improved monitoring of phytoplankton bloom dynamics in a Norwegian fjord by integrating satellite data, pigment analysis, and Ferrybox data with a coastal observation network. Journal of Applied Remote Sensing
    Academic article
  • Brunet, Christophe; Johnsen, Geir; Lavaud, Johan; Roy, Suzanne. (2011) Pigments and photoacclimation processes. Cambridge University Press
    Academic chapter/article/Conference paper
  • Johnsen, Geir; Bricaud, Annick; Nelson, Norman; Prézelin, Barbara; Bidigare, Robert. (2011) In vivo bio-optical properties of phytoplankton pigments. Cambridge University Press
    Academic chapter/article/Conference paper
  • Johnsen, Geir; Moline, Mark; Pettersson, Lasse H.; Pinckney, J. L.; Pozdnyakov, Dmitry; Egeland, Einar Skarstad. (2011) Optical monitoring of phytoplankton bloom pigment signatures. Cambridge University Press
    Academic chapter/article/Conference paper
  • Roy, Suzanne; Llewellyn, Carole; Egeland, Einar Skarstad; Johnsen, Geir. (2011) Acknowledgements. Cambridge University Press
    Other
  • Roy, Suzanne; Llewellyn, Carole; Egeland, Einar Skarstad; Johnsen, Geir. (2011) Preface. Cambridge University Press
    Foreword
  • Llewellyn, Carole A.; Roy, Suzanne; Johnsen, Geir; Egeland, Einar Skarstad; Chauton, Matilde ; Hallegraeff, Gustaff. (2011) Perspectives on future directions. Cambridge University Press
    Academic chapter/article/Conference paper
  • Andersen, Hanne Kile; Johnsen, Geir; Bakken, Torkild. (2011) Gastropods Associated with Laminaria hyperborea and Saccorhiza polyschides in a Norwegian Kelp Forest: Comparison of Sampling and In Situ Imaging Techniques. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Masters thesis

2010

  • Aamot, Inga; Berge, Jørgen; Hancke, Kasper; Johnsen, Geir; Moline, Mark; Schofield, Oscar. (2010) NORUS - Technology Development for Marine Monitoring and Ocean Observation:An North America-Norway educational program. http://ipy-osc.no/abstract/
    Abstract
  • Thoen, Hanne Halkinrud; Johnsen, Geir; Berge, Jørgen. (2010) Pigmentation and spectral absorbance in the deep-sea arctic amphipods Eurythenes gryllus and Anonyx sp. Polar Biology
    Academic article
  • Johnsen, Geir; Søreide, Fredrik. (2010) Underwater hyperspectral imaging of marine mineral deposits. Underwater Mining meeting Institute (UMI)
    Abstract

2009

  • Evertsen, Jussi; Johnsen, Geir. (2009) In vivo and in vitro differences in chloroplast functionality in the two north Atlantic sacoglossans (Gastropoda, Opisthobranchia) Placida dendritica and Elysia viridis. Marine Biology
    Academic article
  • Volent, Z; Johnsen, Geir; Sigernes, Fred. (2009) Microscopic hyperspectral imaging used as a bio-optical taxonomic tool for micro- and macroalgae. Applied Optics
    Academic article
  • Berge, Jørgen; Cottier, Finlo; Last, Kim S.; Varpe, Øystein; Leu, Eva; Søreide, Janne. (2009) Diel vertical migration of Arctic zooplankton during the polar night. Biology Letters
    Academic article
  • Berge, Jørgen; Lønne, Ole Jørgen; Renaud, Paul; Johnsen, Geir; Gulliksen, Bjørn; Varpe, Øystein. (2009) Polartorsken - vil den bli utkonkurrert av sørlige fiskearter?. Svalbardposten
    Popular scientific article
  • Sakshaug, Egil; Johnsen, Geir; Kovacs, Kit. (2009) Ecosystem Barents Sea. Tapir Akademisk Forlag Tapir Akademisk Forlag
    Academic anthology/Conference proceedings
  • Øye, Ane-Marte; Johnsen, Geir. (2009) Photobioreactor time-series of a simulated bloom of Emiliania huxleyi. NTNU, Institutt for biologi
    Masters thesis
  • Johnsen, Geir; Nepstad, Ina. (2009) Cloning and characterisation of interleukin-6 and interleukin-11b in Atlantic halibut (Hippoglossus hippoglossus). NTNU, Institutt for biologi
    Masters thesis
  • Thoen, Hanne Halkinrud; Johnsen, Geir. (2009) Pigmentation in the Arctic deep-sea amphipods Eurythenes gryllus and Anonyx sp. NTNU, Institutt for biologi
    Masters thesis
  • Elde, Anette Cecilie; Johnsen, Geir. (2009) Pigmentation in deep-water corals from the Trondheimsfjord, Norway. NTNU, Institutt for biologi
    Masters thesis
  • von Quillfeldt, Cecilie H.; Hegseth, Else Nøst; Johnsen, Geir; Sakshaug, Egil; Syvertsen, Erik. (2009) Ice algae. Tapir Akademisk Forlag
    Academic chapter/article/Conference paper
  • von Quillfeldt, Cecilie; Hegseth, Else Nøst; Johnsen, Geir; Sakshaug, Egil; Syvertsen, Erik E.. (2009) Ice algae. Tapir Akademisk Forlag
    Academic chapter/article/Conference paper
  • Quillfeldt, C.v.; Hegseth, E.N.; Johnsen, Geir; Sakshaug, E.; Syvertsen, E.E.. (2009) Ice algae. Tapir Akademisk Forlag
    Academic chapter/article/Conference paper
  • Sakshaug, E.; Johnsen, Geir; Volent, Z. (2009) Light. Tapir Akademisk Forlag
    Academic chapter/article/Conference paper
  • Johnsen, Geir; Volent, Z; Sakshaug, E.; Sigernes, Fred; Pettersson, L.H.. (2009) Remote sensing in the Barents Sea. Tapir Akademisk Forlag
    Academic chapter/article/Conference paper
  • Sakshaug, E.; Johnsen, Geir; Kristiansen, Svein; Quillfeldt, C.v.; Rey, F.; Slagstad, D.. (2009) Phytoplankton and primary production. Tapir Akademisk Forlag
    Academic chapter/article/Conference paper
  • Sakshaug, Egil; Johnsen, Geir; Kristiansen, Svein; von Quillfeldt, Cecilie; Rey, Francisco; Slagstad, Dag. (2009) Phytoplankton and primary production. Tapir Akademisk Forlag
    Academic chapter/article/Conference paper
  • Johnsen, Geir; Volent, Zsolt; Sakshaug, Egil; Sigernes, Fred; Pettersson, Lasse H.. (2009) Remote sensing in the Barents Sea. Tapir Akademisk Forlag
    Academic chapter/article/Conference paper
  • Sakshaug, Egil; Johnsen, Geir; Volent, Z.. (2009) Light. Tapir Akademisk Forlag
    Academic chapter/article/Conference paper
  • Sakshaug, E.; Johnsen, Geir; Kovacs, Kit. (2009) Ecosystem Barents Sea. Tapir Akademisk Forlag Tapir Akademisk Forlag
    Textbook
  • Sakshaug, Egil; Johnsen, Geir; Kovacs, Kit M.. (2009) Ecosystem Barents Sea. Tapir Akademisk Forlag Tapir Akademisk Forlag
    Non-fiction book
  • Nymark, Marianne; Valle, Kristin Collier; Brembu, Tore; Winge, Per; Hancke, Kasper; Andresen, Kjersti. (2009) An integrated analysis of molecular acclimation to high light in the marine diatom Phaeodactylum tricornutum. PLOS ONE
    Academic article

2008

  • Hovland, Erlend Kjeldsberg; Johnsen, Geir; Moline, Mark. (2008) Combined use of AUV and hyperspectral imaging to mapping sea-surface and macroalgae. Ocean Optics
    Abstract
  • Bredholt, Harald; Fjærvik, Espen; Johnsen, Geir; Zotchev, Sergey. (2008) Actinomycetes from sediments in the Trondheim Fjord, Norway: Diversity and biological activity. Marine Drugs
    Academic article
  • Hancke, Torunn Beate; Hancke, Kasper; Johnsen, Geir; Sakshaug, Egil. (2008) Rate of O2 production derived from pulse-amplitude-modulated fluorescence: Testing three biooptical approaches against measured O2-production rate. Journal of Phycology
    Academic article
  • Bakken, Torkild; Evertsen, Jussi; Johnsen, Geir. (2008) Vitenskapelig dykking - behov for endringer i forskriften. Dykkenytt : informasjonsorgan for dykkeindustrien
    Article in business/trade/industry journal
  • Hancke, Kasper; Hancke, Torunn Beate; Olsen, Lasse Mork; Johnsen, Geir; Glud, RN. (2008) Temperature effects on microalgal photosynthesis-light responses measured by O2 production, pulse-amplitude-modulated fluorescence, and C-14 assimilation. Journal of Phycology
    Academic article
  • Båtnes, Anna Solvang; Johnsen, Geir. (2008) Trophic interaction between little auks and their zooplankton prey in a high Arctic fjord based on lipid analyses. NTNU, Institutt for biologi
    Masters thesis

2007

  • Johnsen, Geir; Volent, Zsolt; Sigernes, F.. (2007) Fine scale studies using hyper-spectral remote sensing. ESSAS Meeting in Marine Arctic Climate
    Report
  • Johnsen, Geir; Volent, Zsolt; Sigernes, F.; Berge, Jørgen; Hovland, Erlend Kjeldsberg; Sakshaug, Egil. (2007) Local hyperspectral imaging of ocean colour from tethered balloons in the Arctic. In Proceedings from Arctic Frontiers: Balancing human use and ecosystem protection. UiT Norges arktiske universitet UiT Norges arktiske universitet
    Report
  • Volent, Z; Johnsen, Geir; Sigernes, Fred. (2007) Kelp forest mapping by use of airborne hyperspectral imager. Journal of Applied Remote Sensing
    Academic article
  • Carlsen, BP; Johnsen, Geir; Berge, Jørgen; Kuklinski, P. (2007) Biodiversity patterns of macro-epifauna on different lamina parts of Laminaria digitata and Saccharina latissima collected during spring and summer 2004 in Kongsfjorden, Svalbard. Polar Biology
    Academic article
  • Cibic, Tamara; Blasutto, Oriana; Hancke, Kasper; Johnsen, Geir. (2007) Microphytobenthic species composition, pigment concentration, and primary production in sublittoral sediments of the Trondheimsfjord (Norway). Journal of Phycology
    Academic article
  • Ludvigsen, Martin; Sortland, Bjørn; Johnsen, Geir; Singh, Hanumant. (2007) Applications of Geo-Referenced Underwater Photo Mosaics in Marine Biology and Archaeology. Oceanography
    Academic article
  • Edvardsen, B; Eikrem, W; Shalchian-Tabrizi, K; Riisberg, I; Johnsen, Geir; Naustvoll, L. (2007) Verrucophora farcimen gen. et sp nov (Dictyochophyceae, Heterokonta) - A bloom-forming ichthyotoxic flagellate from the Skagerrak, Norway. Journal of Phycology
    Academic article
  • Johnsen, Geir; Sakshaug, Egil. (2007) Biooptical characteristics of PSII and PSI in 33 species (13 pigment groups) of marine phytoplankton, and the relevance for pulse-amplitude-modulated and fast-repetition-rate fluorometry. Journal of Phycology
    Academic article
  • Johnsen, Geir. (2007) Arctic Life: Bridging ecosystem function using remote sensing technologies. Svalbard Science Forum
    Popular scientific article
  • Hancke, Kasper; Johnsen, Geir. (2007) Photosynthetic responses as a function of light and temperature: Field and laboratory studies on marine microalgae. NTNU, Institutt for biologi
    Doctoral dissertation
  • Hancke, Kasper; Johnsen, Geir; Sakshaug, Egil. (2007) Bio-optical properties and spectral attenuation of photosynthetically available radiation: relation to primary productivity and phytoplankton composition. In Proceedings from Arctic Frontiers: balancing human use and ecosystem protection. UiT Norges arktiske universitet UiT Norges arktiske universitet
    Report
  • Berge, Jørgen; Schander, C; Pampanin, D.M.; Johnsen, Geir. (2007) The past, present and future of the Mytilus edulis population on Svalbard. In Proceedings from Arctic Frontiers: Balancing human use and ecosystem protection. UiT Norges arktiske universitet UiT Norges arktiske universitet
    Report
  • Stübner, Eike; Johnsen, Geir. (2007) Biogeographical distribution of temperate vs. Arctic benthic species around Svalbard. NTNU, Institutt for biologi
    Masters thesis
  • Pettersen, Ragnhild; Johnsen, Geir. (2007) Phytoplankton systematics and pigmentation in the Arctic. NTNU, Institutt for biologi
    Masters thesis
  • Hovland, Erlend Kjeldsberg; Sakshaug, Egil; Johnsen, Geir. (2007) Tracing Coccolithophorid Blooms in the Barents Sea Using MODIS Level-3 Imagery. NTNU, Institutt for biologi
    Masters thesis
  • Elvestrand, Jostein; Johnsen, Geir; Sneli, Jon-Arne. (2007) Morphometry and patterns of growth in Acesta excavata (Bivalvia: Limidae) from the Trondheimsfjord, Norway. NTNU, Institutt for biologi
    Thesis at a second degree level
  • Kleiven, Mona; Johnsen, Geir. (2007) Pigmentation in Halocynthia pyriformis from Isfjorden, Spitsbergen. NTNU, Institutt for biologi
    Masters thesis
  • Evertsen, Jussi; Burghardt, Ingo; Johnsen, Geir; Wägele, Heike. (2007) Retention of functional chloroplasts in some sacoglossans from the Indo-Pacific and Mediterranean. Marine Biology
    Academic article

2006

  • Berge, Jørgen; Johnsen, Geir; Nilsen, Frank; Nilsen, Frank; Gulliksen, Bjørn; Slagstad, Dag. (2006) The Mytilus edulis population in Svalbard: how and why. Marine Ecology Progress Series
    Editorial
  • Roy, Suzanne; Egeland, Einar Skarstad; Johnsen, Geir; Llewellyn, Carole; Wright, Simon. (2006) Report of a Workshop on a Follow-Up Volume of the Book "Phytoplankton Pigments in Oceanography". Scientific Committee on Oceanic Research
    Report
  • Olsen, Lasse Mork; Öztürk, M.; Sakshaug, Egil; Johnsen, Geir. (2006) Photosynthesis-induced phosphate precipitation in seawater: ecological implications for phytoplankton. Marine Ecology Progress Series
    Academic article
  • Rodriguez, F; Chauton, Matilde Skogen; Johnsen, Geir; Andresen, Kjersti; Olsen, Lasse Mork; Zapata, M.. (2006) Photoacclimation in phytoplankton: implications for biomass estimates, pigment functionality and chemotaxonomy. Marine Biology
    Academic article
  • Johnsen, Geir. (2006) Warming Arctic sees return of blue mussels after 1000 years. National Geographic
    Popular scientific article
  • Onstad, L; Evertsen, Jussi; Johnsen, Geir. (2006) Snegle på solceller. Gemini
    Popular scientific article
  • Sylling, Guro; Thingstad, Per Gustav; Johnsen, Geir. (2006) Marin bunndyrfauna (Gastropoda, Bivalvia) - Konsekvenser av åpning av veifylling over Ramsarområdet Tautrasvaet. NTNU, Institutt for biologi
    Masters thesis
  • Carlsen, Beth Paludan; Johnsen, Geir. (2006) Makroepifauna associeret med Laminaria digitata og L. saccharina, Svalbard. NTNU, Institutt for biologi
    Masters thesis
  • Berge, Jørgen; Johnsen, Geir; Nilsen, Frank; Gulliksen, Bjørn; Slagstad, Dag; Pampanin, Daniella. (2006) The Mytilus edulis population in Svalbard: how and why. Marine Ecology Progress Series
    Academic article

2005

  • Burghardt, Ingo; Evertsen, Jussi; Johnsen, Geir; Wägele, Heike. (2005) Solar powered seaslugs - Mutualistic symbiosis of aeolid nudibranchia (Mollusca, Gastropoda, Opisthobranchia) with Symbiodinium. Symbiosis
    Academic article
  • Fossmark, Reidar; Johnsen, Geir; Waldum, Helge; Johannesen, Eli Marie. (2005) Rebound acid hypersecretion after long-term inhibition of gastric acid secretion. Alimentary Pharmacology and Therapeutics
    Academic article
  • Berge, Jørgen; Johnsen, Geir; Nilsen, Frank; Gulliksen, Bjørn; Slagstad, Dag. (2005) Ocean temperature oscillations enable reappearance of blue mussels Mytilus edulis in Svalbard after 1000 year absence. Marine Ecology Progress Series
    Academic article
  • Bordvik, Hans Otto; Johnsen, Geir. (2005) “Forskning og foto under vann”. NEWTON websider (NRK)
    Popular scientific article
  • Bordvik, Hans Otto; Johnsen, Geir. (2005) “En glupsk nellik”. NEWTON websider (NRK)
    Popular scientific article
  • Indergaard, M; Nordtvedt, M; Johnsen, Geir. (2005) Satellittmålinger for miljøet (SISCAL project, NTNU, IBI). Gemini
    Popular scientific article
  • Hilstad, Kari; Johnsen, Geir. (2005) In situ tidsseriemålinger av lyshøstingsegenskaper og cellekjemi hos marine makroalger i Trondheimsfjorden. NTNU, Institutt for biologi
    Thesis at a second degree level
  • Olsen, Lasse Mork; Johnsen, Geir. (2005) Interactions between marine osmo- and phagotrophs in different physicochemical environments. NTNU, Institutt for biologi
    Doctoral dissertation
  • Valle, Kristin Collier; Johnsen, Geir. (2005) Detection of monthly variation in marine red, brown and green macroalgae by means of in situ video, epifluorescence microscopy and numerical digital image analysis. NTNU, Institutt for biologi
    Thesis at a second degree level
  • Chauton, Matilde Skogen; Johnsen, Geir; Sakshaug, Egil. (2005) Nuclear Magnetic Resonance spectroscopy of marine microalgae: Metabolic profiling and species discrimination from High-resolution Magic Angle Spinning NMR analysis of whole-cell samples. NTNU, Institutt for biologi
    Doctoral dissertation
  • Sakshaug, Egil; Johnsen, Geir. (2005) Absorption, fluorescence excitation and photoacclimation in phytoplankton. Multi-Science Publishing
    Academic chapter/article/Conference paper
  • Sakshaug, Egil; Johnsen, Geir. (2005) Algal cultures, Analogues of Blooms and Applications. Multi-Science Publishing Multi-Science Publishing
    Academic anthology/Conference proceedings
  • Berge, J; Johnsen, Geir; Nilsen, F; Gulliksen, B; Slagstad, D. (2005) Ocean temperature oscillations causes the reappearance of blue mussels in Svalbard after 1000 years of absence. Marine Ecology Progress Series
    Academic article

2004

  • Chauton, Matilde Skogen; Tilstone, Gavin; Legrand, Catherine; Johnsen, Geir. (2004) Changes in pigmentation, bio-optical characteristics and photophysiology, during phytoflagellate succession in mesocosms. Journal of Plankton Research
    Academic article
  • Hancke, Torunn Beate; Johnsen, Geir. (2004) SISCAL processor evaluation document. www.siscal.net
    Report

2003

  • Johansen, Torunn Beate; Johnsen, Geir. (2003) SISCAL End User Requirement evaluation document. www.siscal.net. Satellite-based Information System on Coastal Areas and Lakes. IST 2000
    Academic article
  • Figueroa, F. L.; Escassi, L.; Perez-Rodriguez, E.; Korbee, N.; Johnsen, Geir. (2003) Effects of the irradiance in the short-term on accumulation of mycosporine like amino acids in sun and shade species of the red algal genus Porphyra. Photochemistry and Photobiology
    Academic article
  • Chauton, Matilde Skogen; Optun, Odd Inge; Bathen, F. T; Volent, Z.; Gribbestad, Ingrid S.; Johnsen, Geir. (2003) HR MAS 1H NMR spectroscopy analysis of whole cells of marine microalgae. Marine Ecology Progress Series
    Academic article
  • Johansen, Torunn Beate; Johnsen, Geir. (2003) SISCAL prototype evaluation document. www.siscal.net. Satellite-based Information System on Coastal Areas and Lakes. IST 2000
    Academic article

2002

  • Gileptis, Laura; Johnsen, Geir; Moxness, Helge; Norwich, Inger; Vangen, Steffen. (2002) Modul for mønstergjenkjenning/klassifisering i DynamicImager ved bruk av backpropagation-algoritmen. Piksel'n : Organ for NOBIM (Norsk forening for bildebehandling og mønstergjenkjenning)
    Academic article
  • Millie, David; Schofield, Oscar; Kirkpatrick, Gary J.; Johnsen, Geir; Evens, Tim J.. (2002) Using absorbance and fluorescence spectra to discriminate microalgae. European journal of phycology
    Academic article
  • Johnsen, Geir; Børsheim, Knut Yngve; Johansen, Torunn Beate. (2002) Production and mortality of phytoplankton and sea-ice microalgae in the southern ocean. Rapportserie (Norsk polarinstitutt)
    Academic article
  • Johansen, Torunn Beate; Johnsen, Geir. (2002) End User requirement evaluation document. [Mangler utgivernavn]
    Report
  • Johansen, Torunn Beate; Johnsen, Geir. (2002) End User Requirements document. [Mangler utgivernavn]
    Report

2001

  • Graneli, Edna; Legrand, Catherine; Carlsson, Per; Johnsen, Geir; Maestrini, Serge Y.; Reichelt, Michael. (2001) (Proceedings of the 9th International conference on Harmful Algal Blooms. Hobart, Tasmania, 7-11 February 20). Structuration of marine phytoplankton communities subjected to different levels of N, P and Si limitation in a mesocosm experiment (summary paper). Phycologia
    Academic article
  • Legrand, Catherine; Johnsen, Geir; Graneli, Edna; Sakshaug, Egil. (2001) (Proceedings of the 9th International conference on Harmful Algal Blooms. Hobart, Tasmania, 7-11 February 2000.) Effect of polyamines on growth and toxicity of Chrysochromulina leadbeateri, Haptophytae. Phycologia
    Academic article
  • Wägele, Heike; Johnsen, Geir. (2001) New results on histology and photosynthetic performance of solar-powered� opisthobranchs (Mollusca, Gastropoda, Opisthobranchia) containing symbiotic chloroplasts or zooxanthellae. Organisms Diversity & Evolution
    Academic article
  • Legrand, Catherine; Johansson, Niclas; Johnsen, Geir; Børsheim, Knut Yngve; Graneli, Edna. (2001) Phagotrophy and toxicity in the photosynthetic Prymnesium patelliferum (Haptophyte). Limnology and Oceanography
    Academic article
  • Johnsen, Geir. (2001) SISCAL End User Requirement Satellite-based Information System on Coastal Areas and Lakes. Information Society Technologies Programme funded by the European Comm
    Report

1998

  • Seppala, J; Johnsen, Geir; Babichenko, S; Leeben, A; Poryvkina, L; Shalapyonok, [Mangler fornavn]. (1998) In vivo light absorption by photosynthetic and photoprotective algal pigments: Methodology and the effects of light acclimation and nutrient limitation. Report Series in Geophysics
    Academic article
  • Johnsen, Geir; Dalløkken, Runar; Aure, J; Skjoldal, H. R. (1998) Photophysiology and environmental conditions during a toxic bloom of Chrysochromulina leadbeateri (Prymnesiophyceae). International symposium on Harmful Algal Blooms
    Academic article
  • Johnsen, Geir; Eikrem, W.; Dalløkken, R.; Aure, J.; Skjoldal, H. R.. (1998) Physiology and environmental conditions during a toxic blooms of Chrysochromulina leadbeateri Prymnesiophyceae. Journal of Phycology
    Academic article
  • Johnsen, Geir; Samset, O.; Sakshaug, Egil. (1998) Bio-optical classification of potential harmful chlorophyll c -containing prymnesiophyte blooms in Scandinavian water.
    Academic chapter/article/Conference paper

1997

  • Millie, D.; Schofield, O. M.; Kirkpatrick, G. J.; Johnsen, Geir; Tester, P. A.; Vinyard, B. T.. (1997) Phytoplankton pigments and absorption spectra as potential bio-markers for harmful algal blooms: A case study of the Florida red-tide dinoflagellat Gymnodinium breve. Limnology and Oceanography
    Academic article
  • Grzymski, J.; Johnsen, Geir; Sakshaug, Egil. (1997) The significance of intracellular self-shading on the bio-optical properties of brown, red and green macroalgal species. Journal of Phycology
    Academic article
  • Grzymski, J.; Johnsen, Geir; Sakshaug, Egil. (1997) The significance of intracellular self-shadingon the bio-optical properties of brown, red and green macroalgal species. Journal of Phycology
    Academic article
  • Johnsen, Geir; Prezelin, B. B.; Jovine, R. V. M.. (1997) Fluorescence excitation spectra and light utiliation in two red tide dinoflagellates. Limnology and Oceanography
    Academic article
  • Johnsen, Geir; Volent, Z.; Tangen, K.; Sakshaug, Egil. (1997) Time series of harmful and benign phytoplankton blooms in northwest European waters using the Seawatch buoy system.
    Academic chapter/article/Conference paper
  • Johnsen, Geir; Volent, Z.; Tangen, K.; Sakshaug, Egil. (1997) Time series of harmful and benign phytoplankton blooms in northwest European waters using the Seawatch buoy system.
    Academic chapter/article/Conference paper

1996

  • Millie, D; Shofield, O. M; Kirkpatrick, G. J; Tester, P. A; Johnsen, Geir. (1996) Using bio-optical characterisics as bio-markers for harmful algal blooms: A case study of the Florida red-tide dinoflagellate,. EOS
    Academic article
  • Schofield, O.; Prezelin, B. B.; Johnsen, Geir. (1996) Wavelength-dependency of maximum quantum yield of carbon fixation for two red tide dinoflagellates, Heterocapsa pygmaea and prorocentrum minimum. Journal of Phycology
    Academic article
  • Johnsen, Geir; Volent, Z; Tangen, K; Sakshaug, Egil. (1996) Time-series of potential toxic phytoplankton blooms in North European waters in 1993 using the SEAWATCH-Europe buoy system. EOS
    Academic article
  • Vernet, M.; Mitchell, B.G.; Sakshaug, Egil; Johnsen, Geir; Iturriaga, R.; Wassmann, P.. (1996) Evidence for a novel pigment with in vivo absorption maximum at 708 nm associated with Phaeocystis cf. pouchetii blooms. Marine Ecology Progress Series
    Academic article
  • Johnsen, Geir; Sakshaug, Egil. (1996) Light harvesting in bloom-forming marine phytoplankton: Species-specifity and photoacclimation,. Scientia Marina
    Academic article
  • Vernet, M.; Mitchell, B. G.; Sakshaug, Egil; Johnsen, Geir; Iturriaga, R.; Wassmann, P.. (1996) Evidence for a novel pigment with in vivo absorption maximum at 708 nm associated with Phaeocystis sp. blooms. Marine Ecology Progress Series
    Academic article

1995

  • Jovine, R. V.; Johnsen, Geir; Prezelin, B. B.. (1995) Isolation of membrane bound chlorophyll a-chlorofhyll c binding light harvesting complexes from the dinoflagellates heterocapsa pygmaea and Prorocentrum minimum. Photosynthesis Research
    Academic article
  • Johnsen, Geir; Sakshaug, Egil. (1995) Light harvesting in bloom-forming marine phytoplankton: species-specificity and photoadaption. Scientia Marina
    Academic article
  • Egeland, E.; Johnsen, Geir; Eikrem, W.; Liaaen-Jensen, S.; Throndsen, J.. (1995) The pigments of Bathycoccus prasinos. Journal of Phycology
    Academic article

1994

  • Jovine, R. V; Johnsen, Geir; Prezelin, B. B. (1994) Photoadaptation of Prorocentrum minimum and Heterocapsa pygmaea (Dinoflagellates): Chromoprotein changes and the consequenses for spectral absorption. EOS
    Academic article
  • Johnsen, Geir; Nelson, N. B.; Jovine, R. V. M.; Prezelin, B. B.. (1994) Chromoprotein- and pigment-dependent modeling of spectral light absorption in two dinoflagellates, Prorocentrum minimum and Heterocapsa pygmaea. Marine Ecology Progress Series
    Academic article
  • Johnsen, Geir; Samset, O.; Granskog, L.; Sakshaug, Egil. (1994) In vivo absorption characteristics in 10 classes of phytoplankton: Taxonomic characteristics and responses to photoadaption by means of discriminant and HPLC analysis. Marine Ecology Progress Series
    Academic article
  • Jovine, R. V.; Schofield, O.; Johnsen, Geir; Prezelin, B. B.. (1994) Photoacclimatory differences in the light-harvesting complex of the bloom forming dinoflagellates Heterocapsa pygmaea and Prorocentrum minimum. Journal of Phycology
    Academic article
  • Johnsen, Geir. (1994) Light Harvesting and Utiliation in Marine Phytoplankton: Species-Specific and Photoadaptive Responses. Dr. Scient. Thesis in Marine Botany, University of Trondheim
    Doctoral dissertation

1993

  • Volent, Zsolt; Johnsen, Geir. (1993) Presentation of an optical sensor-"OPTISENS" designed for Eulerian measurements of Phytoplankton on a buoy. Underwater light measurements. Proceedings from International Symposium on high latitude optics.
    Academic article
  • Johnsen, Geir; Sakshaug, Egil. (1993) Bio-optical characteristics and photoadaptive responses in the toxic and bloomforming dinoflagellates Gyrodinium aureolum, Gymnodinium galatheanum two strains of Prorocentrum minium. Journal of Phycology
    Academic article
  • Gilstad, Mona; Johnsen, Geir; Sakshaug, Egil. (1993) Photosynthetic parameters, pigment composition and respiration rates of the marine diatom Skeletonema costatum grown in continuous light and a 12:1 light-dark cycle. Journal of Plankton Research
    Academic article

1992

  • Volent, Zsolt; Johnsen, Geir. (1992) Presentation of an optical sensor-"OPTISENS" designed for Eulerian measurements of Phytoplankton on a moored buoy. ABOOS (Autonomous Bio-Optical Observing Systems) Scientific Symposium : Abstracts
    Academic article
  • Johnsen, Geir; Samset, Oddgeir; Zsolt, Volent. (1992) Bio-optical characteristicts of phytoplankton in relation to remote sensing. ABOOS (Autonomous Bio-Optical Observing Systems) Scientific Symposium : Abstracts
    Academic article
  • Johnsen, Geir; Sakshaug, Egil; Vernet, Maria. (1992) Pigment composition, spectral characteriation and photosynthetic parameters in Chrysochromulina polylepis. Marine Ecology Progress Series
    Academic article
  • Syvertsen, E.; Hegseth, E; Johnsen, Geir; Sakshaug, Egil; Gulliksen, B; Lønne, O. J. (1992) Livet i isen (The life in the ice). In Økosystem Barentshavet. [Mangler utgivernavn]
    Non-fiction book
  • Sakshaug, Egil; Kristiansen, S; Syvertsen, E; Eilertsen, H. C; Gilstad, M; Hegseth, E. N. (1992) Planktonalger (Phytoplankton). In Økosystem Barentshavet. [Mangler utgivernavn]
    Non-fiction book

1991

  • Johnsen, Geir. (1991) Proceedings from a scientific working meeting. Fisken og Havet
    Academic article
  • Johnsen, Geir. (1991) Identification of Chrysochromulina leadbeateri by means of remote sensing. Fisken og Havet
    Academic article
  • Sakshaug, Egil; Johnsen, Geir; Samset, Oddgeir; Zsolt, Volent. (1991) Identification of phytoplankton blooms by means of remote sensing. Environment Northern Seas
    Academic article
  • Johnsen, Geir; Hegseth, Else Nøst. (1991) Photoadaptation of sea-ice microalgae in the Barents Sea. Polar Biology
    Academic article
  • Sakshaug, Egil; Johnsen, Geir; Andresen, Kjersti; Vernet, Maria. (1991) Modeling of light-dependent algal photosynthesis and growth: Experiments with the Barents Sea diatoms Thalassiosira nordensskioeldii and Chaetocero furcellatus. Deep-Sea Research Part II: Topical Studies in Oceanography
    Academic article

Journal publications

  • Berge, Jørgen; Bakken, Torkild; Heggland, Kristin; Sneli, Jon-Arne; Ødegård, Øyvind; Ingulstad, Mats. (2025) Exploring Climate Change, Geopolitics, Marine Archeology, and Ecology in the Arctic Ocean Through Wood-Boring Bivalves. Oceanography
    Academic article
  • Ingulstad, Mats; Bakken, Torkild; Ellefmo, Steinar Løve; Johnsen, Geir; Hagspiel, Verena. (2024) Villedende om hypotetiske havbunnsmineraler?. Dagens næringsliv
    Reader opinion piece
  • Ingulstad, Mats; Bakken, Torkild; Ellefmo, Steinar Løve; Johnsen, Geir; Hagspiel, Verena. (2024) Norge mangler kunnskap om gruvedrift i dyphavet. Gemini (English edition)
    Feature article
  • Ingulstad, Mats; Bakken, Torkild; Ellefmo, Steinar Løve; Hagspiel, Verena; Johnsen, Geir. (2024) Feil på feil om gruvedrift på havbunnen - Stortingsmeldingen om gruvedrift på havbunnen holder ikke vann. Dagens næringsliv
    Feature article
  • Ingulstad, Mats; Bakken, Torkild; Johnsen, Geir; Ellefmo, Steinar Løve; Hagspiel, Verena. (2024) Norway needs to know much more before actually mining the deep sea. Norwegian SciTech News
    Feature article
  • Overrein, Martin Molberg; Tinn, Phil; Aldridge, David; Johnsen, Geir; Moreira Fragoso, Glaucia. (2024) Biomass estimations of cultivated kelp using underwater RGB images from a mini-ROV and computer vision approaches. Frontiers in Marine Science
    Academic article
  • Schartmüller, Bernhard; Mckee, David; Berge, Jørgen; Johnsen, Geir. (2024) Calibration verification of an underwater hyperspectral imaging push broom instrument to measure light in absolute units and field demonstration. Applied Optics
    Academic article
  • Faltynkova, Andrea; Deschenes, Catherine; Zolich, Artur; Wagner, Martin; Johansen, Tor Arne; Johnsen, Geir. (2024) Use of an uncrewed surface vehicle and near infrared hyperspectral imaging for sampling and analysis of aquatic microplastics. Marine Pollution Bulletin
    Academic article
  • Moreira Fragoso, Glaucia; Dallolio, Alberto; Grant, Stephen Denis; Garrett, Joseph Landon; Ellingsen, Ingrid Helene; Johnsen, Geir. (2024) The Role of Rapid Changes in Weather on Phytoplankton Spring Bloom Dynamics From Mid-Norway Using Multiple Observational Platforms. Journal of Geophysical Research (JGR): Oceans
    Academic article
  • Liu, Hongbo; Summers, Natalie Maria; Chen, Yi-Chun; Løvås, Håvard Snefjellå; Johnsen, Geir; Koestner, Daniel Warren. (2024) Pixelwise immersion factor calibration for underwater hyperspectral imaging instruments. Optics Express
    Academic article
  • Moreira Fragoso, Glaucia; Dallolio, Alberto; Grant, Stephen Denis; Garrett, Joseph Landon; Ellingsen, Ingrid Helene; Johnsen, Geir. (2024) The Role of Rapid Changes in Weather on Phytoplankton Spring Bloom Dynamics Captured by an Autonomous Uncrewed Surface Vehicle. Earth and Space Science
    Academic article
  • Mo-Bjørkelund, Tore; Majaneva, Sanna Kristiina; Moreira Fragoso, Glaucia; Johnsen, Geir; Ludvigsen, Martin. (2024) Multi-vehicle adaptive 3D mapping for targeted ocean sampling. PLOS ONE
    Academic article
  • Bakken, Sivert; Luis, Kelly; Johnsen, Geir; Johansen, Tor Arne. (2023) Evaluating hyperspectral Secchi depth retrieval through hybrid modeling and regression. Workshop on Hyperspectral Image and Signal Processing, Evolution in Remote Sensing
    Academic article
  • Sørensen, Asgeir Johan; Ludvigsen, Martin; Sivertsen, Eirik Selnæs; Johnsen, Geir; Johansen, Tor Arne. (2023) Hvem skal samle inn, forvalte og ha tilgang til informasjon om havområdene? . Gemini.no
    Feature article
  • Sørensen, Asgeir Johan; Ludvigsen, Martin; Sivertsen, Eirik; Johnsen, Geir; Johansen, Tor Arne. (2023) Hvem skal samle inn, forvalte og ha tilgang til informasjon om havområdene? . Forskning.no
    Feature article
  • Deschenes, C; Zolich, Artur; Wagner, Martin; Johnsen, Geir; Johansen, Tor Arne; Faltynkova, Andrea. (2023) Unmanned vehicle and hyperspectral imager for a more rapid microplastics sampling and analysis. OCEANS
    Academic article
  • Nordahl, A; Dugstad, L; Magnussen, O; Bakken, JB; Johnsen, Geir. (2023) Laksegriseriet. Dagens næringsliv
    Interview Journal
  • Carson, Siri Granum; Jenssen, Munro, Bjoern; Johnsen, Geir; Mason, Arthur. (2023) En bærekraftig fremtid for Svalbard – er utvinning av dyphavsmineraler en del av svaret?. Svalbardposten
    Feature article
  • Summers, Natalie Maria; Moreira Fragoso, Glaucia; Johnsen, Geir. (2023) Photophysiologically active green, red, and brown macroalgae living in the Arctic Polar Night. Scientific Reports
    Academic article
  • Sørensen, Asgeir Johan; Ludvigsen, Martin; Sivertsen, Eirik Selnæs; Johnsen, Geir; Johansen, Tor Arne. (2023) Hvem skal samle inn, forvalte og ha tilgang til informasjon om havområdene? . Teknisk Ukeblad
    Feature article
  • Sørensen, Asgeir Johan; Ludvigsen, Martin; Siversten, Eirik; Johnsen, Geir; Johansen, Tor Arne. (2023) Who should collect, manage and have access to data from the oceans?. sciencenorway.no
    Feature article
  • oudijk, AE; Johansen, Tor Arne; Johnsen, Geir; Alver, Morten Omholt. (2023) Simulating Hyperspectral Datacubes for Ocean Color: A Foundation for Phytoplankton Recognition in Spectral Signatures. OCEANS
    Academic article
  • Schartmuller, Bernhard; Anderson, Philip; Mckee, David; Connan-McGinty, Stacey; Kopec, Tomasz Piotr; Daase, Malin Hildegard Elisabeth. (2023) Development and calibration of a high dynamic range and autonomous ocean-light instrument to measure sub-surface profiles in ice-covered waters. Applied Optics
    Academic article
  • Gerland, Sebastian; Ingvaldsen, Randi Brunvær; Reigstad, Marit; Sundfjord, Arild; Bogstad, Bjarte; Chierici, Melissa. (2023) Still Arctic? — The changing Barents Sea. Elementa: Science of the Anthropocene
    Academic literature review
  • Williamson, David Roddan; Moreira Fragoso, Glaucia; Majaneva, Sanna Kristiina; Dallolio, Alberto; Halvorsen, Daniel Ørnes; Hasler, Oliver Kevin. (2023) Monitoring Algal Blooms with Complementary Sensors on Multiple Spatial and Temporal Scales. Oceanography
    Academic article
  • Bakken, Sivert; Henriksen, Marie Bøe; Birkeland, Roger; Langer, Dennis David; Oudijk, Adriënne Esmeralda; Berg, Simen. (2023) HYPSO-1 CubeSat: First Images and In-Orbit Characterization. Remote Sensing
    Academic article
  • Grant, Stephen Denis; Johnsen, Geir; Mckee, David; Zolich, Artur Piotr; Cohen, Jonathan H.. (2023) Spectral and RGB analysis of the light climate and its ecological impacts using an all-sky camera system in the Arctic. Applied Optics
    Academic article
  • Connan-McGinty, Stacey; Banas, Neil S.; Berge, Jørgen; Cottier, Finlo Robert; Grant, Stephen; Johnsen, Geir. (2022) Midnight Sun to Polar Night: A Model of Seasonal Light in the Barents Sea. Journal of Advances in Modeling Earth Systems
    Academic article
  • Oudijk, Esmée; Hasler, Oliver Kevin; Øveraas, Henning; Marty, Sabine; Williamson, David Roddan; Svendsen, Torbjørn Karl. (2022) Campaign For Hyperspectral Data Validation In North Atlantic Coastal Waters. Workshop on Hyperspectral Image and Signal Processing, Evolution in Remote Sensing
    Academic article
  • Fragoso, Glaucia Moreira; Davies, Emlyn John; Fossum, Trygve Olav; Ullgren, Jenny; Majaneva, Sanna; Aberle-Malzahn, Nicole. (2022) Contrasting phytoplankton-zooplankton distributions observed through autonomous platforms, in-situ optical sensors and discrete sampling. PLOS ONE
    Academic article
  • Summers, Natalie; Johnsen, Geir; Mogstad, Aksel Alstad; Løvås, Håvard; Fragoso, Glaucia Moreira; Berge, Jørgen. (2022) Underwater Hyperspectral Imaging of Arctic Macroalgal Habitats during the Polar Night Using a Novel Mini-ROV-UHI Portable System. Remote Sensing
    Academic article
  • Dona, Angela; Evertsen, Jussi; Johnsen, Geir. (2022) The role of parapodia and lack of photoacclimation in kleptoplasts of the sacoglossan sea slug Plakobranchus ocellatus. Coral reefs
    Academic article
  • Mogstad, Aksel Alstad; Løvås, Håvard; Sture, Øystein; Johnsen, Geir; Ludvigsen, Martin. (2022) Remote Sensing of the Tautra Ridge: An Overview of the World’s Shallowest Cold-Water Coral Reefs. Frontiers in Marine Science
    Academic article
  • Ringvold, Halldis; Taite, Morag; Allcock, A. Louise; Vecchione, Michael; Péan, Michel; Sandulli, Roberto. (2021) In situ recordings of large gelatinous spheres from NE Atlantic, and the first genetic confirmation of egg mass of Illex coindetii (Vérany, 1839) (Cephalopoda, Mollusca). Scientific Reports
    Academic article
  • Bakken, Sivert; Johnsen, Geir; Johansen, Tor Arne. (2021) Analysis and Model Development of Direct Hyperspectral Chlorophyll-A Estimation for Remote Sensing Satellites. Workshop on Hyperspectral Image and Signal Processing, Evolution in Remote Sensing
    Academic article
  • Løvås, Håvard; Mogstad, Aksel Alstad; Sørensen, Asgeir Johan; Johnsen, Geir. (2021) A Methodology for Consistent Georegistration in Underwater Hyperspectral Imaging. IEEE Journal of Oceanic Engineering
    Academic article
  • Faltynkova, Andrea; Johnsen, Geir; Wagner, Martin. (2021) Hyperspectral imaging as an emerging tool to analyze microplastics: A systematic review and recommendations for future development. Microplastics and Nanoplastics
    Academic literature review
  • Johnsen, Geir; Zolich, Artur; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan H.; Mckee, David. (2021) All-sky camera system providing high temporal resolution annual time series of irradiance in the arctic. Applied Optics
    Academic article
  • Geoffroy, Maxime; Langbehn, Tom Jasper; Priou, Pierre; Varpe, Øystein; Johnsen, Geir; Le Bris, Arnault. (2021) Pelagic organisms avoid white, blue, and red artificial light from scientific instruments. Scientific Reports
    Academic article
  • Bazilchuk, Nancy Reney; Stahl, Annette; Johnsen, Geir; Saad, Aya; Thu, Maren; Nøland, Annecken. (2021) Sporhunden som lukter mikroalger. . Gemini.no
    Popular scientific article
  • Bazilchuk, Nancy Reney; Berge, Jørgen; Johnsen, Geir. (2021) Lysforurensning I Arktis kan ha ødelagt forskningsresultater. Gemini.no
    Popular scientific article
  • Cardwell, CR; Berge, Jørgen; Johnsen, Geir. (2021) Arctic voyage shines light on some cold, hard truths. The Herald, UK
    Popular scientific article
  • Cohen, Jonathan H.; Last, Kim; Charpentier, Corie L.; Cottier, Finlo; Daase, Malin; Hobbs, Laura. (2021) Photophysiological cycles in Arctic krill are entrained by weak midday twilight during the Polar Night. PLoS Biology
    Academic article
  • Horni, K; Sørensen, Asgeir Johan; Johnsen, Geir; Ludvigsen, Martin. (2021) Internasjonalt forskningsmiljø dykker i Mjøsa etter at Oppland Arbeiderblad skrev om forurensning. Oppland arbeiderblad
    Popular scientific article
  • Berge, Jørgen; Geoffroy, Maxime; Daase, Malin; Cottier, Finlo Robert; Priou, Pierre; Cohen, Jonathan H.. (2020) Artificial light during the polar night disrupts Arctic fish and zooplankton behavior down to 200 m depth. Communications Biology
    Academic article
  • Mogstad, Aksel Alstad; Ødegård, Øyvind; Nornes, Stein Melvær; Ludvigsen, Martin; Johnsen, Geir; Sørensen, Asgeir Johan. (2020) Mapping the Historical Shipwreck Figaro in the High Arctic Using Underwater Sensor-Carrying Robots. Remote Sensing
    Academic article
  • Gibbens, Sarah; Berge, Jørgen; Johnsen, Geir; Mckee, David. (2020) As the Arctic warms, light pollution may pose a new treat to marine life. . National Geographic
    Interview Journal
  • Ramirez-Llodra, Eva; Hilário, Ana; Paulsen, Emil; Costa, Carolina; Bakken, Torkild; Johnsen, Geir. (2020) Benthic Communities on the Mohn’s Treasure Mound: Implications for Management of Seabed Mining in the Arctic Mid-Ocean Ridge. Frontiers in Marine Science
    Academic article
  • Fragoso, Glaucia Moreira; Johnsen, Geir; Chauton, Matilde Skogen; Cottier, Finlo Robert; Ellingsen, Ingrid H.. (2020) Phytoplankton community succession and dynamics using optical approaches. Continental Shelf Research
    Academic article
  • Saad, Aya; Stahl, Annette; Våge, Andreas; Davies, Emlyn John; Nordam, Tor; Aberle-Malzahn, Nicole. (2020) Advancing Ocean Observation with an AI-driven Mobile Robotic Explorer. Oceanography
    Academic article
  • Mogstad, Aksel Alstad; Johnsen, Geir; Ludvigsen, Martin. (2019) Shallow-Water Habitat Mapping using Underwater Hyperspectral Imaging from an Unmanned Surface Vehicle: A Pilot Study. Remote Sensing
    Academic article
  • Bazilchuk, Nancy Reney; Fossum, Trygve Olav; Fragoso, Glaucia Moreira; Ludvigsen, Martin; Johnsen, Geir. (2019) Smart undervannsrobot leter etter plankton. Av N Bazilchuk. Forskning.no. Angående NTNU Entice prosjekt publisert i Science Robotics. Forskning.no
    Popular scientific article
  • Fossum, Trygve Olav; Fragoso, Glaucia Moreira; Davies, Emlyn John; Ullgren, Jenny; Mendes, Renato; Johnsen, Geir. (2019) Toward adaptive robotic sampling of phytoplankton in the coastal ocean. Science robotics
    Academic article
  • Fragoso, Glaucia Moreira; Poulton, Alex James; Pratt, Nicola Jane; Johnsen, Geir; Purdie, Duncan Alastair. (2019) Trait-based analysis of subpolar North Atlantic phytoplankton and plastidic ciliate communities using automated flow cytometer. Limnology and Oceanography
    Academic article
  • Kleiven, Wanda; Johnsen, Geir; Ardelan, Murat Van. (2019) Sea surface microlayer and elemental composition in phaeo-, chloro-, and rhodophytes in winter and spring. Journal of Phycology
    Academic article
  • Kauko, Hanna Maria; Pavlov, Alexey; Johnsen, Geir; Granskog, Mats; Peeken, Ilka; Assmy, Philipp. (2019) Photoacclimation state of an Arctic underice phytoplankton bloom. Journal of Geophysical Research (JGR): Oceans
    Academic article
  • Fragoso, Glaucia Moreira; Davies, Emlyn John; Ellingsen, Ingrid H.; Chauton, Matilde Skogen; Fossum, Trygve Olav; Ludvigsen, Martin. (2019) Physical controls on phytoplankton size structure, photophysiology and suspended particles in a Norwegian biological hotspot. Progress in Oceanography
    Academic article
  • Liefmann, Stephanie; Järnegren, Johanna; Johnsen, Geir; Murray, Fiona. (2018) Eco-physiological responses of cold-water soft corals to anthropogenic sedimentation and particle shape. Journal of Experimental Marine Biology and Ecology
    Academic article
  • Johnsen, Geir; Norli, Marit; Moline, Mark A.; Robbins, Ian; Quillfeldt, Cecilie von; Sørensen, Kai. (2018) The advective origin of an under-ice spring bloom in the Arctic Ocean using multiple observational platforms. Polar Biology
    Academic article
  • Berge, Jørgen; Johnsen, Geir. (2018) Lysforurensning truer livet i Arktis. Aftenposten Viten
    Feature article
  • Ludvigsen, Martin; Berge, Jørgen; Geoffroy, Maxime; Cohen, Jonathan H.; De La Torre, Pedro R.; Nornes, Stein Melvær. (2018) Use of an autonomous surface vehicle reveals small-scale diel vertical migrations of zooplankton and susceptibility to light pollution under low solar irradiance. Science Advances
    Academic article
  • Fragoso, Glaucia Moreira; Poulton, Alex J.; Yashayaev, Igor M.; Head, Erica J.H.; Johnsen, Geir; Purdie, Duncan A.. (2018) Diatom biogeography from the Labrador Sea revealed through a trait-based approach. Frontiers in Marine Science
    Academic article
  • Dumke, Ines; Ludvigsen, Martin; Ellefmo, Steinar Løve; Søreide, Fredrik; Johnsen, Geir; Murton, Bramley J.. (2018) Underwater Hyperspectral Imaging Using a Stationary Platform in the Trans-Atlantic Geotraverse Hydrothermal Field. IEEE Transactions on Geoscience and Remote Sensing
    Academic article
  • Geoffroy, Maxime; Berge, Jørgen; Majaneva, Sanna Kristiina; Johnsen, Geir; Langbehn, Tom; Cottier, Finlo Robert. (2018) Increased occurrence of the jellyfish Periphylla periphylla in the European high Arctic. Polar Biology
    Short communication
  • Kauko, Hanna Maria; Olsen, Lasse Mork; Duarte, Pedro; Peeken, Ilka; Granskog, Mats A.; Johnsen, Geir. (2018) Algal colonization of young arctic sea ice in spring. Frontiers in Marine Science
    Academic article
  • Dumke, Ines; Purser, Autun; Marcon, Yann; Nornes, Stein Melvær; Johnsen, Geir; Ludvigsen, Martin. (2018) Underwater hyperspectral imaging as an in situ taxonomic tool for deep-sea megafauna. Scientific Reports
    Academic article
  • Fossum, Trygve Olav; Eidsvik, Jo; Ellingsen, Ingrid H.; Alver, Morten; Fragoso, Glaucia Moreira; Johnsen, Geir. (2018) Information-driven robotic sampling in the coastal ocean. Journal of Field Robotics (JFR)
    Academic article
  • Ødegård, Øyvind; Mogstad, Aksel Alstad; Johnsen, Geir; Sørensen, Asgeir Johan; Ludvigsen, Martin. (2018) Underwater hyperspectral imaging: a new tool for marine archaeology. Applied Optics
    Academic article
  • Berge, Jørgen; Johnsen, Geir. (2018) Lysforurensning - enda en kilde til bekymring. Svalbardposten
    Feature article
  • Dumke, Ines; Nornes, Stein Melvær; Purser, Autun; Marcon, Yann; Ludvigsen, Martin; Ellefmo, Steinar Løve. (2018) First hyperspectral imaging survey of the deep seafloor: High-resolution mapping of manganese nodules. Remote Sensing of Environment
    Academic article
  • Gabrielsen, Tove M.; Johnsen, Geir. (2018) Skogen på Svalbard. Svalbardposten
    Popular scientific article
  • Berge, Jørgen; Johnsen, Geir. (2017) Kunnskapshull om livet i Arktis i mørketiden. Aftenposten Viten
    Feature article
  • Berge, Jørgen; Johnsen, Geir. (2017) Superkommunisten. Svalbardposten
    Feature article
  • Berge, Jørgen; Johnsen, Geir. (2017) Om bambus, spøkelseskreps og et Arktis i endring. Svalbardposten
    Feature article
  • Assmy, Philipp; Fernández-Méndez, Mar; Duarte, Pedro; Meyer, Amelie; Randelhoff, Achim; Mundy, Christopher John. (2017) Leads in Arctic pack ice enable early phytoplankton blooms below snow-covered sea ic. Scientific Reports
    Academic article
  • Mogstad, Aksel Alstad; Johnsen, Geir. (2017) Spectral characteristics of coralline algae: a multi-instrumental approach, with emphasis on underwater hyperspectral imaging. Applied Optics
    Academic article
  • Otterlei, Inger; Johnsen, Geir; Sørensen, Asgeir Johan; Ludvigsen, Martin; Hareide, Nils Roar; Christensen-Dalsgaard, Signe. (2017) 300 000 sjøfugl er forsvunnet fra Runde. Sunnmørsposten
    Interview Journal
  • Johnsen, Geir; Christiansen, Hanne H; Ravolainen, Virve; Reymert, Per Kyrre; Jenssen, Eva Therese; Arlov, Thor Bjørn. (2017) Utfordrende natur og sikkerhet på Svalbard. Svalbardposten
    Feature article
  • Kauko, Hanna Maria; Taskjelle, Torbjørn; Assmy, Philipp; Pavlov, Alexey K.; Mundy, C.J.; Duarte, Pedro. (2017) Windows in Arctic sea ice: light transmission and ice algae in a refrozen lead. Journal of Geophysical Research (JGR): Biogeosciences
    Academic article
  • Ostaszewska, Kaja; Balazy, Piotr; Berge, Jørgen; Johnsen, Geir; Staven, Robert. (2017) Seabirds during Arctic Polar Night: underwater observations from Svalbard archipelago, Norway. Waterbirds (De Leon Springs, Fla.)
    Academic article
  • Johnsen, Geir. (2016) Yrende liv i Isfjorden. Svalbardposten
    Popular scientific article
  • Bjørgan, Espen Halvorsen; Johnsen, Geir; Kjeken, Jon; Ludvigsen, Martin. (2016) Fant buss på 600 m dybde. Adresseavisen
    Popular scientific article
  • Aarskog, Karine Nigar; Berge, Jørgen; Johnsen, Geir; Sørensen, Asgeir Johan. (2016) Et stort løft for arktisk forskning (NTNU & UiT). Universitetet i Tromsø
    Article in business/trade/industry journal
  • Berge, Jørgen; Falk-Petersen, Stig; Renaud, Paul E.; Daase, Malin; Geoffroy, Maxime; Johnsen, Geir. (2016) En reise mot Ultima Thule. Svalbardposten
    Popular scientific article
  • Lervik, Frank; Johnsen, Geir; Ludvigsen, Martin; Kjeken, John. (2016) Det ligger flere busser der. Adresseavisen
    Popular scientific article
  • Bazilchuk, Nancy Reney; Johnsen, Geir; Berge, Jørgen; Ludvigsen, Martin; Sørensen, Asgeir Johan; Ødegård, Øyvind. (2016) Mørkets fyrster, varulver og Indiana Jones. Gemini
    Popular scientific article
  • Haudemann-Andersen, Jørn; Lystad, M S; Johnsen, Geir; Sørensen, Asgeir Johan; Berge, Jørgen. (2016) Blå lys i det kalde dyp. NRK Trøndelag, Nyheter
    Popular scientific article
  • Haugstad, Tor; Erdal, Ivar; Johnsen, Geir; Sørensen, Asgeir Johan; Fjærvik, Nils. (2016) Gründerne mener dette kameraet kan bli det nye ekkoloddet – Ecotone er kandidat til TU Tech Award. Teknisk Ukeblad
    Popular scientific article
  • Berge, Jørgen; Geoffroy, Maxime; Johnsen, Geir; Cottier, Finlo Robert; Bluhm, Bodil; Vogedes, Daniel Ludwig. (2016) Ice-tethered observational platforms in the Arctic Ocean pack ice. IFAC-PapersOnLine
    Academic article
  • Cronin, Heather; Cohen, Jonathan H.; Berge, Jørgen; Johnsen, Geir; Moline, Mark A.. (2016) Bioluminescence as an ecological factor during high Arctic polar night. Scientific Reports
    Academic article
  • Berge, Jørgen; Johnsen, Geir; Ødegård, Øyvind. (2016) Mark spiser opp vrak på havbunnen. Fiskaren
    Popular scientific article
  • Kokkegård, Hanne; Johnsen, Geir; Ludvigsen, Martin; Torre, Pedro De La. (2016) Vitenskab - Bomber fra 2 verdenskrig danner koralrev på 600 m dybde. Danmarks radio
    Popular scientific article
  • Berge, Jørgen; Johnsen, Geir. (2016) Mørkets fyrster med påskrudd lys. Svalbardposten
    Popular scientific article
  • Bazilchuk, Nancy Reney; Leite, Stein Roar; Johnsen, Geir; Kjeken, John; Sørensen, Asgeir Johan; Ludvigsen, Martin. (2016) Bomber og buss på havbunnen. Gemini
    Popular scientific article
  • Haugstad, Tormod; Erdal, Ivar; Johnsen, Geir. (2016) Kameraet deres «kan bli det nye ekkoloddet». Nå er det norske selskapet i ferd med å lykkes. Teknisk Ukeblad
    Interview Journal
  • Berge, Jørgen; Ødegård, Øyvind; Johnsen, Geir. (2016) Opp fra polarnattens mørke. Aftenposten Viten
    Feature article
  • Donahue, Michelle; Berge, Jørgen; Johnsen, Geir; Ødegård, Øyvind. (2016) The age of humans - living in the anthropocene - "Termites of the sea" found munching wood near Arctic shipwrecks. Smithsonian
    Popular scientific article
  • Johnsen, Geir; Ludvigsen, Martin; Sørensen, Asgeir Johan; Aas, Lars Martin Sandvik. (2016) The use of underwater hyperspectral imaging deployed on remotely operated vehicle – methods and applications. IFAC-PapersOnLine
    Academic article
  • Bondø, Tor-Hartvig; Johnsen, Geir; Berge, Jørgen. (2016) Fant yrende liv i polarnatta. VG : Verdens gang
    Popular scientific article
  • Kintisch, Eli; Berge, Jørgen; Last, Kim; Cohen, Jonathan; Johnsen, Geir. (2016) Voyage into darkness . Science
    Interview Journal
  • Bazilchuk, Nancy Reney; Johnsen, Geir; Berge, Jørgen; Sørensen, Asgeir Johan; Ødegård, Øyvind. (2016) Dark lords, werewolves and Indiana Jones in the polar night. Gemini (English edition)
    Interview Journal
  • Berge, Jørgen; Johnsen, Geir; Ødegård, Øyvind. (2016) Kinderegg i polarnatten. Svalbardposten
    Feature article
  • Krüger, Frida Jørstad; Johnsen, Geir; Kjeken, John; Ludvigsen, Martin. (2016) Gammel buss ble korallrev. NRK Viten
    Popular scientific article
  • Berge, Jørgen; Renaud, Paul E.; Johnsen, Geir; Darnis, Gerald; Geoffroy, Maxime; Daase, Malin. (2016) I grenselandet (mellom Tull og Thule). Svalbardposten
    Popular scientific article
  • Berge, Jørgen; Ødegård, Øyvind; Johnsen, Geir. (2016) A bitter-sweet symphony. Svalbardposten
    Feature article
  • Berge, Jørgen; Johnsen, Geir; Ludvigsen, Martin; Cohen, Jonathan. (2016) Design for latskap - men med store muligheter. Svalbardposten
    Feature article
  • Førde, Henny; Forbord, Silje; Handå, Aleksander; Fossberg, Julia; Arff, Johanne; Johnsen, Geir. (2016) Development of bryozoan fouling on cultivated kelp (Saccharina latissima) in Norway. Journal of Applied Phycology
    Academic article
  • Cohen, Jonathan H.; Berge, Jørgen; Moline, Mark A.; Sørensen, Asgeir Johan; Last, Kim; Falk-Petersen, Stig. (2015) Is ambient light during the high Arctic polar night sufficient to act as a visual cue for zooplankton?. PLOS ONE
    Academic article
  • Berge, Jørgen; Renaud, Paul; Darnis, Gérald; Cottier, Finlo; Last, Kim; Gabrielsen, Tove M.. (2015) In the dark: a review of ecosystem processes during the Arctic polar night. Progress in Oceanography
    Academic article
  • Berge, Jørgen; Daase, Malin; Renaud, Paul; Ambrose, William G. Jr.; Darnis, Gérald; Last, Kim S. (2015) Unexpected levels of biological activity during the polar night offer new perspectives on a warming Arctic. Current Biology
    Academic article
  • Nilssen, Ingunn; Dos Santos, Francisco; Coutinho, Ricardo; Gomes, Natalia; Cabral, Marcelo M.; Eide, Ingvar. (2015) Assessing the potential impact of water-based drill cuttings on deep water calcareous red algae using species specific impact categories and measured oceanographic and discharge data. Marine Environmental Research
    Academic article
  • Berge, Jørgen; Johnsen, Geir; Sørensen, Asgeir Johan; Nilssen, Ingunn. (2015) Enabling technology for Arctic research. Pan European Networks: Science and Techology Magazine
    Academic literature review
  • Nilssen, Ingunn; Santos dos, Francisco; Coutinho, Ricardo; Gomes, Natalia; Cabral Montenegro, Marcelo; Eide, Ingvar. (2015) Assessing the potential impact of water-based drill cuttings on deep-water calcareous red algae using species specific impact categories and measured oceanographic and discharge data. Marine Environmental Research
    Academic article
  • Rodriguez, Francisco; Garrido, J.L.; Sabrino, C; Johnsen, Geir; Riobo, P; Franco, J. (2015) Divinyl chlorophyll a in the marine eukaryotic protist Alexandrium ostenfeldii (Dinophyceae). Environmental Microbiology
    Academic article
  • Nilssen, Ingunn; Ødegård, Øyvind; Sørensen, Asgeir Johan; Johnsen, Geir; Moline, Mark A.; Berge, Jørgen. (2015) Integrated environmental mapping and monitoring, a methodological approach to optimise knowledge gathering and sampling strategy. Marine Pollution Bulletin
    Academic article
  • Hovland, Erlend Kjeldsberg; Hancke, Kasper; Alver, Morten; Drinkwater, Kennneth F.; Høkedal, Jo; Johnsen, Geir. (2014) Optical impact of an Emiliania huxleyi bloom in the frontal region of the Barents Sea. Journal of Marine Systems
    Academic article
  • Hancke, Kasper; Hovland, Erlend Kjeldsberg; Volent, Zsolt; Pettersen, Ragnhild; Johnsen, Geir; Moline, Mark A.. (2014) Optical properties of CDOM across the Polar Front in the Barents Sea: Origin, distribution and significance. Journal of Marine Systems
    Academic article
  • Cohen, Jonathan; Cronin, Heather; Moline, Mark A.; Berge, Jørgen; Johnsen, Geir; Sørensen, Asgeir Johan. (2014) Are krill eyes useful in the high Arctic polar night?. Ocean Optics
    Abstract
  • Hansen, Ingrid; Pettersen, Ragnhild; Beuchel, Frank; Cochrane, Sabine; Frantzen, marianne; Ekehaug, Stefan. (2014) Underwater hyperspectral imaging (UHI) for environmental mapping and monitoring of seabed habitats. Ocean Optics
    Abstract
  • Aamot, Inga; Pokrzywinski, Kaytee; Johnsen, Geir; Berge, Jørgen; Sørensen, Asgeir Johan. (2014) Light Climate and Status of the Photosynthetic Machinery in Macroalgae in the Polar Night. Ocean Optics
    Abstract
  • Nornes, Stein Melvær; Candeloro, Mauro; Ødegård, Øyvind; Johnsen, Geir; Sørensen, Asgeir Johan. (2014) Photomosaic camera as simultaneous data collector and navigation aid on unmanned underwater vehicles. Ocean Optics
    Abstract
  • Johnsen, Geir; Ekehaug, Stefan; Hansen, Ingrid; Sørensen, Asgeir Johan. (2014) The use of underwater hyperspectral imaging deployed on remotely operated vehicles to identify, map and monitor bio-geo-chemical objects of interest. Ocean Optics
    Abstract
  • Nilssen, Ingunn; Ødegård, Øyvind; Johnsen, Geir; Sørensen, Asgeir Johan; Berge, Jørgen; Nornes, Stein Melvær. (2014) Integrated environmental monitoring; a methodological approach to optimise knowledge gathering and sampling strategy. Ocean Optics
    Abstract
  • Berge, Jørgen; Cottier, Finlo; Varpe, Øystein; Renaud, Paul; Falk-Petersen, Stig; Kwasniewski, Sawomir. (2014) Arctic complexity: A case study on diel vertical migration of zooplankton. Journal of Plankton Research
    Academic article
  • Johnsen, Geir; Candeloro, Mauro; Berge, Jørgen; Moline, Mark A.. (2014) Glowing in the dark: Discriminating patterns of bioluminescence from different taxa during the Arctic polar night. Polar Biology
    Academic article
  • Johnsen, Geir; Candeloro, Mauro; Berge, Jørgen; Moline, Mark A.. (2014) Erratum to: Glowing in the dark: discriminating patterns of bioluminescence from different taxa during the Arctic polar night. Polar Biology
    Errata
  • Valle, Kristin Collier; Nymark, Marianne; Aamot, Inga; Hancke, Kasper; Winge, Per; Andresen, Kjersti. (2014) System responses to equal doses of photosynthetically usable radiation of blue, green, and red light in the marine diatom Phaeodactylum tricornutum. PLOS ONE
    Academic article
  • Pettersen, Ragnhild; Johnsen, Geir; Bruheim, Per; Andreassen, Trygve. (2014) Development of hyperspectral imaging as a bio-optical taxonomic tool for pigmented marine organisms. Organisms Diversity & Evolution
    Academic article
  • Ludvigsen, Martin; Johnsen, Geir; Sørensen, Asgeir Johan; Lågstad, Petter Arthur; Ødegård, Øyvind. (2014) Scientific Operations Combining ROV and AUV in the Trondheim Fjord. Marine Technology Society journal
    Academic article
  • Hovland, Erlend Kjeldsberg; Dierssen, Heidi; Ferreira, Ana Sofia; Johnsen, Geir. (2013) Dynamics regulating major trends in Barents Sea temperatures and subsequent effect on remotely sensed particulate inorganic carbon. Marine Ecology Progress Series
    Academic article
  • Nymark, Marianne; Valle, Kristin Collier; Hancke, Kasper; Winge, Per; Andresen, Kjersti; Johnsen, Geir. (2013) Molecular and photosynthetic responses to prolonged darkness and subsequent acclimation to re-illumination in the diatom Phaeodactylum tricornutum. PLOS ONE
    Academic article
  • Berge, Jørgen; Johnsen, Geir; Falk-Pettersen, Stig. (2013) Mørkets hemmeligheter. Svalbardposten
    Popular scientific article
  • Båtnes, Anna Solvang; Miljeteig, Cecilie; Berge, Jørgen; Greenacre, Michael; Johnsen, Geir. (2013) Quantifying the light sensitivity of Calanus spp. during the polar night: potential for orchestrated migrations conducted by ambient light from the sun, moon, or aurora borealis. Polar Biology
    Academic article
  • Elde, Anette; Pettersen, Ragnhild; Bruheim, Per; Järnegren, Johanna; Johnsen, Geir. (2012) Pigmentation and Spectral Absorbance Signatures in Deep-Water Corals from the Trondheimsfjord, Norway. Marine Drugs
    Academic article
  • Berge, Jørgen; Båtnes, Anna Solvang; Johnsen, Geir; Blackwell, Susan; Moline, Mark A.. (2012) Bioluminescence in the high Arctic during the polar night. Marine Biology
    Academic article
  • Gabrielsen, Tove M; Quillfeldt, Cecilie von; Johnsen, Geir; Berge, Jørgen. (2012) Varm vinter, sen vår i fjorden. Svalbardposten
    Reader opinion piece
  • Pettersen, Ragnhild; Johnsen, Geir; Berge, Jørgen; Hovland, Erlend Kjeldsberg. (2011) Phytoplankton chemotaxonomy in waters around the Svalbard archipelago reveals high amounts of Chl b and presence of gyroxanthin-diester. Polar Biology
    Academic article
  • Jouenne, Fabien; Eikrem, Wenche; Le Gall, F; Marie, Dominique; Johnsen, Geir; Vaulot, Daniel. (2011) Prasinoderma singularis sp. nov. (Prasinophyceae, Chlorophyta), a Solitary Coccoid Prasinophyte from the South-East Pacific Ocean. Protist
    Academic article
  • Thoen, Hanne Halkinrud; Johnsen, Geir; Berge, Jørgen. (2011) Pigmentation and spectral absorbance in the deep-sea arctic amphipods Eurythenes gryllus and Anonyx sp. Polar Biology
    Academic article
  • Volent, Zsolt; Johnsen, Geir; Hovland, Erlend Kjeldsberg; Folkestad, Are; Olsen, Lasse Mork; Tangen, Karl. (2011) Improved monitoring of phytoplankton bloom dynamics in a Norwegian fjord by integrating satellite data, pigment analysis, and Ferrybox data with a coastal observation network. Journal of Applied Remote Sensing
    Academic article
  • Aamot, Inga; Berge, Jørgen; Hancke, Kasper; Johnsen, Geir; Moline, Mark; Schofield, Oscar. (2010) NORUS - Technology Development for Marine Monitoring and Ocean Observation:An North America-Norway educational program. http://ipy-osc.no/abstract/
    Abstract
  • Thoen, Hanne Halkinrud; Johnsen, Geir; Berge, Jørgen. (2010) Pigmentation and spectral absorbance in the deep-sea arctic amphipods Eurythenes gryllus and Anonyx sp. Polar Biology
    Academic article
  • Johnsen, Geir; Søreide, Fredrik. (2010) Underwater hyperspectral imaging of marine mineral deposits. Underwater Mining meeting Institute (UMI)
    Abstract
  • Evertsen, Jussi; Johnsen, Geir. (2009) In vivo and in vitro differences in chloroplast functionality in the two north Atlantic sacoglossans (Gastropoda, Opisthobranchia) Placida dendritica and Elysia viridis. Marine Biology
    Academic article
  • Volent, Z; Johnsen, Geir; Sigernes, Fred. (2009) Microscopic hyperspectral imaging used as a bio-optical taxonomic tool for micro- and macroalgae. Applied Optics
    Academic article
  • Berge, Jørgen; Cottier, Finlo; Last, Kim S.; Varpe, Øystein; Leu, Eva; Søreide, Janne. (2009) Diel vertical migration of Arctic zooplankton during the polar night. Biology Letters
    Academic article
  • Berge, Jørgen; Lønne, Ole Jørgen; Renaud, Paul; Johnsen, Geir; Gulliksen, Bjørn; Varpe, Øystein. (2009) Polartorsken - vil den bli utkonkurrert av sørlige fiskearter?. Svalbardposten
    Popular scientific article
  • Nymark, Marianne; Valle, Kristin Collier; Brembu, Tore; Winge, Per; Hancke, Kasper; Andresen, Kjersti. (2009) An integrated analysis of molecular acclimation to high light in the marine diatom Phaeodactylum tricornutum. PLOS ONE
    Academic article
  • Hovland, Erlend Kjeldsberg; Johnsen, Geir; Moline, Mark. (2008) Combined use of AUV and hyperspectral imaging to mapping sea-surface and macroalgae. Ocean Optics
    Abstract
  • Bredholt, Harald; Fjærvik, Espen; Johnsen, Geir; Zotchev, Sergey. (2008) Actinomycetes from sediments in the Trondheim Fjord, Norway: Diversity and biological activity. Marine Drugs
    Academic article
  • Hancke, Torunn Beate; Hancke, Kasper; Johnsen, Geir; Sakshaug, Egil. (2008) Rate of O2 production derived from pulse-amplitude-modulated fluorescence: Testing three biooptical approaches against measured O2-production rate. Journal of Phycology
    Academic article
  • Bakken, Torkild; Evertsen, Jussi; Johnsen, Geir. (2008) Vitenskapelig dykking - behov for endringer i forskriften. Dykkenytt : informasjonsorgan for dykkeindustrien
    Article in business/trade/industry journal
  • Hancke, Kasper; Hancke, Torunn Beate; Olsen, Lasse Mork; Johnsen, Geir; Glud, RN. (2008) Temperature effects on microalgal photosynthesis-light responses measured by O2 production, pulse-amplitude-modulated fluorescence, and C-14 assimilation. Journal of Phycology
    Academic article
  • Volent, Z; Johnsen, Geir; Sigernes, Fred. (2007) Kelp forest mapping by use of airborne hyperspectral imager. Journal of Applied Remote Sensing
    Academic article
  • Carlsen, BP; Johnsen, Geir; Berge, Jørgen; Kuklinski, P. (2007) Biodiversity patterns of macro-epifauna on different lamina parts of Laminaria digitata and Saccharina latissima collected during spring and summer 2004 in Kongsfjorden, Svalbard. Polar Biology
    Academic article
  • Cibic, Tamara; Blasutto, Oriana; Hancke, Kasper; Johnsen, Geir. (2007) Microphytobenthic species composition, pigment concentration, and primary production in sublittoral sediments of the Trondheimsfjord (Norway). Journal of Phycology
    Academic article
  • Ludvigsen, Martin; Sortland, Bjørn; Johnsen, Geir; Singh, Hanumant. (2007) Applications of Geo-Referenced Underwater Photo Mosaics in Marine Biology and Archaeology. Oceanography
    Academic article
  • Edvardsen, B; Eikrem, W; Shalchian-Tabrizi, K; Riisberg, I; Johnsen, Geir; Naustvoll, L. (2007) Verrucophora farcimen gen. et sp nov (Dictyochophyceae, Heterokonta) - A bloom-forming ichthyotoxic flagellate from the Skagerrak, Norway. Journal of Phycology
    Academic article
  • Johnsen, Geir; Sakshaug, Egil. (2007) Biooptical characteristics of PSII and PSI in 33 species (13 pigment groups) of marine phytoplankton, and the relevance for pulse-amplitude-modulated and fast-repetition-rate fluorometry. Journal of Phycology
    Academic article
  • Johnsen, Geir. (2007) Arctic Life: Bridging ecosystem function using remote sensing technologies. Svalbard Science Forum
    Popular scientific article
  • Evertsen, Jussi; Burghardt, Ingo; Johnsen, Geir; Wägele, Heike. (2007) Retention of functional chloroplasts in some sacoglossans from the Indo-Pacific and Mediterranean. Marine Biology
    Academic article
  • Berge, Jørgen; Johnsen, Geir; Nilsen, Frank; Nilsen, Frank; Gulliksen, Bjørn; Slagstad, Dag. (2006) The Mytilus edulis population in Svalbard: how and why. Marine Ecology Progress Series
    Editorial
  • Olsen, Lasse Mork; Öztürk, M.; Sakshaug, Egil; Johnsen, Geir. (2006) Photosynthesis-induced phosphate precipitation in seawater: ecological implications for phytoplankton. Marine Ecology Progress Series
    Academic article
  • Rodriguez, F; Chauton, Matilde Skogen; Johnsen, Geir; Andresen, Kjersti; Olsen, Lasse Mork; Zapata, M.. (2006) Photoacclimation in phytoplankton: implications for biomass estimates, pigment functionality and chemotaxonomy. Marine Biology
    Academic article
  • Johnsen, Geir. (2006) Warming Arctic sees return of blue mussels after 1000 years. National Geographic
    Popular scientific article
  • Onstad, L; Evertsen, Jussi; Johnsen, Geir. (2006) Snegle på solceller. Gemini
    Popular scientific article
  • Berge, Jørgen; Johnsen, Geir; Nilsen, Frank; Gulliksen, Bjørn; Slagstad, Dag; Pampanin, Daniella. (2006) The Mytilus edulis population in Svalbard: how and why. Marine Ecology Progress Series
    Academic article
  • Burghardt, Ingo; Evertsen, Jussi; Johnsen, Geir; Wägele, Heike. (2005) Solar powered seaslugs - Mutualistic symbiosis of aeolid nudibranchia (Mollusca, Gastropoda, Opisthobranchia) with Symbiodinium. Symbiosis
    Academic article
  • Fossmark, Reidar; Johnsen, Geir; Waldum, Helge; Johannesen, Eli Marie. (2005) Rebound acid hypersecretion after long-term inhibition of gastric acid secretion. Alimentary Pharmacology and Therapeutics
    Academic article
  • Berge, Jørgen; Johnsen, Geir; Nilsen, Frank; Gulliksen, Bjørn; Slagstad, Dag. (2005) Ocean temperature oscillations enable reappearance of blue mussels Mytilus edulis in Svalbard after 1000 year absence. Marine Ecology Progress Series
    Academic article
  • Bordvik, Hans Otto; Johnsen, Geir. (2005) “Forskning og foto under vann”. NEWTON websider (NRK)
    Popular scientific article
  • Bordvik, Hans Otto; Johnsen, Geir. (2005) “En glupsk nellik”. NEWTON websider (NRK)
    Popular scientific article
  • Indergaard, M; Nordtvedt, M; Johnsen, Geir. (2005) Satellittmålinger for miljøet (SISCAL project, NTNU, IBI). Gemini
    Popular scientific article
  • Berge, J; Johnsen, Geir; Nilsen, F; Gulliksen, B; Slagstad, D. (2005) Ocean temperature oscillations causes the reappearance of blue mussels in Svalbard after 1000 years of absence. Marine Ecology Progress Series
    Academic article
  • Chauton, Matilde Skogen; Tilstone, Gavin; Legrand, Catherine; Johnsen, Geir. (2004) Changes in pigmentation, bio-optical characteristics and photophysiology, during phytoflagellate succession in mesocosms. Journal of Plankton Research
    Academic article
  • Johansen, Torunn Beate; Johnsen, Geir. (2003) SISCAL End User Requirement evaluation document. www.siscal.net. Satellite-based Information System on Coastal Areas and Lakes. IST 2000
    Academic article
  • Figueroa, F. L.; Escassi, L.; Perez-Rodriguez, E.; Korbee, N.; Johnsen, Geir. (2003) Effects of the irradiance in the short-term on accumulation of mycosporine like amino acids in sun and shade species of the red algal genus Porphyra. Photochemistry and Photobiology
    Academic article
  • Chauton, Matilde Skogen; Optun, Odd Inge; Bathen, F. T; Volent, Z.; Gribbestad, Ingrid S.; Johnsen, Geir. (2003) HR MAS 1H NMR spectroscopy analysis of whole cells of marine microalgae. Marine Ecology Progress Series
    Academic article
  • Johansen, Torunn Beate; Johnsen, Geir. (2003) SISCAL prototype evaluation document. www.siscal.net. Satellite-based Information System on Coastal Areas and Lakes. IST 2000
    Academic article
  • Gileptis, Laura; Johnsen, Geir; Moxness, Helge; Norwich, Inger; Vangen, Steffen. (2002) Modul for mønstergjenkjenning/klassifisering i DynamicImager ved bruk av backpropagation-algoritmen. Piksel'n : Organ for NOBIM (Norsk forening for bildebehandling og mønstergjenkjenning)
    Academic article
  • Millie, David; Schofield, Oscar; Kirkpatrick, Gary J.; Johnsen, Geir; Evens, Tim J.. (2002) Using absorbance and fluorescence spectra to discriminate microalgae. European journal of phycology
    Academic article
  • Johnsen, Geir; Børsheim, Knut Yngve; Johansen, Torunn Beate. (2002) Production and mortality of phytoplankton and sea-ice microalgae in the southern ocean. Rapportserie (Norsk polarinstitutt)
    Academic article
  • Graneli, Edna; Legrand, Catherine; Carlsson, Per; Johnsen, Geir; Maestrini, Serge Y.; Reichelt, Michael. (2001) (Proceedings of the 9th International conference on Harmful Algal Blooms. Hobart, Tasmania, 7-11 February 20). Structuration of marine phytoplankton communities subjected to different levels of N, P and Si limitation in a mesocosm experiment (summary paper). Phycologia
    Academic article
  • Legrand, Catherine; Johnsen, Geir; Graneli, Edna; Sakshaug, Egil. (2001) (Proceedings of the 9th International conference on Harmful Algal Blooms. Hobart, Tasmania, 7-11 February 2000.) Effect of polyamines on growth and toxicity of Chrysochromulina leadbeateri, Haptophytae. Phycologia
    Academic article
  • Wägele, Heike; Johnsen, Geir. (2001) New results on histology and photosynthetic performance of solar-powered� opisthobranchs (Mollusca, Gastropoda, Opisthobranchia) containing symbiotic chloroplasts or zooxanthellae. Organisms Diversity & Evolution
    Academic article
  • Legrand, Catherine; Johansson, Niclas; Johnsen, Geir; Børsheim, Knut Yngve; Graneli, Edna. (2001) Phagotrophy and toxicity in the photosynthetic Prymnesium patelliferum (Haptophyte). Limnology and Oceanography
    Academic article
  • Seppala, J; Johnsen, Geir; Babichenko, S; Leeben, A; Poryvkina, L; Shalapyonok, [Mangler fornavn]. (1998) In vivo light absorption by photosynthetic and photoprotective algal pigments: Methodology and the effects of light acclimation and nutrient limitation. Report Series in Geophysics
    Academic article
  • Johnsen, Geir; Dalløkken, Runar; Aure, J; Skjoldal, H. R. (1998) Photophysiology and environmental conditions during a toxic bloom of Chrysochromulina leadbeateri (Prymnesiophyceae). International symposium on Harmful Algal Blooms
    Academic article
  • Johnsen, Geir; Eikrem, W.; Dalløkken, R.; Aure, J.; Skjoldal, H. R.. (1998) Physiology and environmental conditions during a toxic blooms of Chrysochromulina leadbeateri Prymnesiophyceae. Journal of Phycology
    Academic article
  • Millie, D.; Schofield, O. M.; Kirkpatrick, G. J.; Johnsen, Geir; Tester, P. A.; Vinyard, B. T.. (1997) Phytoplankton pigments and absorption spectra as potential bio-markers for harmful algal blooms: A case study of the Florida red-tide dinoflagellat Gymnodinium breve. Limnology and Oceanography
    Academic article
  • Grzymski, J.; Johnsen, Geir; Sakshaug, Egil. (1997) The significance of intracellular self-shading on the bio-optical properties of brown, red and green macroalgal species. Journal of Phycology
    Academic article
  • Grzymski, J.; Johnsen, Geir; Sakshaug, Egil. (1997) The significance of intracellular self-shadingon the bio-optical properties of brown, red and green macroalgal species. Journal of Phycology
    Academic article
  • Johnsen, Geir; Prezelin, B. B.; Jovine, R. V. M.. (1997) Fluorescence excitation spectra and light utiliation in two red tide dinoflagellates. Limnology and Oceanography
    Academic article
  • Millie, D; Shofield, O. M; Kirkpatrick, G. J; Tester, P. A; Johnsen, Geir. (1996) Using bio-optical characterisics as bio-markers for harmful algal blooms: A case study of the Florida red-tide dinoflagellate,. EOS
    Academic article
  • Schofield, O.; Prezelin, B. B.; Johnsen, Geir. (1996) Wavelength-dependency of maximum quantum yield of carbon fixation for two red tide dinoflagellates, Heterocapsa pygmaea and prorocentrum minimum. Journal of Phycology
    Academic article
  • Johnsen, Geir; Volent, Z; Tangen, K; Sakshaug, Egil. (1996) Time-series of potential toxic phytoplankton blooms in North European waters in 1993 using the SEAWATCH-Europe buoy system. EOS
    Academic article
  • Vernet, M.; Mitchell, B.G.; Sakshaug, Egil; Johnsen, Geir; Iturriaga, R.; Wassmann, P.. (1996) Evidence for a novel pigment with in vivo absorption maximum at 708 nm associated with Phaeocystis cf. pouchetii blooms. Marine Ecology Progress Series
    Academic article
  • Johnsen, Geir; Sakshaug, Egil. (1996) Light harvesting in bloom-forming marine phytoplankton: Species-specifity and photoacclimation,. Scientia Marina
    Academic article
  • Vernet, M.; Mitchell, B. G.; Sakshaug, Egil; Johnsen, Geir; Iturriaga, R.; Wassmann, P.. (1996) Evidence for a novel pigment with in vivo absorption maximum at 708 nm associated with Phaeocystis sp. blooms. Marine Ecology Progress Series
    Academic article
  • Jovine, R. V.; Johnsen, Geir; Prezelin, B. B.. (1995) Isolation of membrane bound chlorophyll a-chlorofhyll c binding light harvesting complexes from the dinoflagellates heterocapsa pygmaea and Prorocentrum minimum. Photosynthesis Research
    Academic article
  • Johnsen, Geir; Sakshaug, Egil. (1995) Light harvesting in bloom-forming marine phytoplankton: species-specificity and photoadaption. Scientia Marina
    Academic article
  • Egeland, E.; Johnsen, Geir; Eikrem, W.; Liaaen-Jensen, S.; Throndsen, J.. (1995) The pigments of Bathycoccus prasinos. Journal of Phycology
    Academic article
  • Jovine, R. V; Johnsen, Geir; Prezelin, B. B. (1994) Photoadaptation of Prorocentrum minimum and Heterocapsa pygmaea (Dinoflagellates): Chromoprotein changes and the consequenses for spectral absorption. EOS
    Academic article
  • Johnsen, Geir; Nelson, N. B.; Jovine, R. V. M.; Prezelin, B. B.. (1994) Chromoprotein- and pigment-dependent modeling of spectral light absorption in two dinoflagellates, Prorocentrum minimum and Heterocapsa pygmaea. Marine Ecology Progress Series
    Academic article
  • Johnsen, Geir; Samset, O.; Granskog, L.; Sakshaug, Egil. (1994) In vivo absorption characteristics in 10 classes of phytoplankton: Taxonomic characteristics and responses to photoadaption by means of discriminant and HPLC analysis. Marine Ecology Progress Series
    Academic article
  • Jovine, R. V.; Schofield, O.; Johnsen, Geir; Prezelin, B. B.. (1994) Photoacclimatory differences in the light-harvesting complex of the bloom forming dinoflagellates Heterocapsa pygmaea and Prorocentrum minimum. Journal of Phycology
    Academic article
  • Volent, Zsolt; Johnsen, Geir. (1993) Presentation of an optical sensor-"OPTISENS" designed for Eulerian measurements of Phytoplankton on a buoy. Underwater light measurements. Proceedings from International Symposium on high latitude optics.
    Academic article
  • Johnsen, Geir; Sakshaug, Egil. (1993) Bio-optical characteristics and photoadaptive responses in the toxic and bloomforming dinoflagellates Gyrodinium aureolum, Gymnodinium galatheanum two strains of Prorocentrum minium. Journal of Phycology
    Academic article
  • Gilstad, Mona; Johnsen, Geir; Sakshaug, Egil. (1993) Photosynthetic parameters, pigment composition and respiration rates of the marine diatom Skeletonema costatum grown in continuous light and a 12:1 light-dark cycle. Journal of Plankton Research
    Academic article
  • Volent, Zsolt; Johnsen, Geir. (1992) Presentation of an optical sensor-"OPTISENS" designed for Eulerian measurements of Phytoplankton on a moored buoy. ABOOS (Autonomous Bio-Optical Observing Systems) Scientific Symposium : Abstracts
    Academic article
  • Johnsen, Geir; Samset, Oddgeir; Zsolt, Volent. (1992) Bio-optical characteristicts of phytoplankton in relation to remote sensing. ABOOS (Autonomous Bio-Optical Observing Systems) Scientific Symposium : Abstracts
    Academic article
  • Johnsen, Geir; Sakshaug, Egil; Vernet, Maria. (1992) Pigment composition, spectral characteriation and photosynthetic parameters in Chrysochromulina polylepis. Marine Ecology Progress Series
    Academic article
  • Johnsen, Geir. (1991) Proceedings from a scientific working meeting. Fisken og Havet
    Academic article
  • Johnsen, Geir. (1991) Identification of Chrysochromulina leadbeateri by means of remote sensing. Fisken og Havet
    Academic article
  • Sakshaug, Egil; Johnsen, Geir; Samset, Oddgeir; Zsolt, Volent. (1991) Identification of phytoplankton blooms by means of remote sensing. Environment Northern Seas
    Academic article
  • Johnsen, Geir; Hegseth, Else Nøst. (1991) Photoadaptation of sea-ice microalgae in the Barents Sea. Polar Biology
    Academic article
  • Sakshaug, Egil; Johnsen, Geir; Andresen, Kjersti; Vernet, Maria. (1991) Modeling of light-dependent algal photosynthesis and growth: Experiments with the Barents Sea diatoms Thalassiosira nordensskioeldii and Chaetocero furcellatus. Deep-Sea Research Part II: Topical Studies in Oceanography
    Academic article

Artistic productions

  • Snyder, Mike; Berge, Jørgen; Johnsen, Geir; Mckee, David. (2021) “Into the dark” documentary by Mike Snyder following Jørgen Berge (UiT), Geir Johnsen (NTNU) and David McKee (Uni Strathclyde) during Polar Night marine ecology work. .
    Film

Books

  • Berge, Jørgen; Johnsen, Geir; Cohen, Jonathan H.. (2020) Polar night marine ecology - life and light in the dead of night. Springer Advances in Polar Ecology (0)
    Academic anthology/Conference proceedings
  • Roy, Suzanne; Llewellyn, Carole; Egeland, Einar Skarstad; Johnsen, Geir. (2012) Phytoplankton Pigments: Characterization, Chemotaxonomy and Applications in Oceanography. Cambridge University Press Cambridge Environmental Chemistry Series (2012)
    Academic anthology/Conference proceedings
  • Roy, Suzanne; Llewellyn, Carole; Egeland, Einar Skarstad; Johnsen, Geir. (2011) Phytoplankton pigments : characterization, chemotaxonomy and applications in oceanography. Cambridge University Press Cambridge Environmental Chemistry Series (2011)
    Academic anthology/Conference proceedings
  • Sakshaug, Egil; Johnsen, Geir; Kovacs, Kit. (2009) Ecosystem Barents Sea. Tapir Akademisk Forlag Tapir Akademisk Forlag
    Academic anthology/Conference proceedings
  • Sakshaug, E.; Johnsen, Geir; Kovacs, Kit. (2009) Ecosystem Barents Sea. Tapir Akademisk Forlag Tapir Akademisk Forlag
    Textbook
  • Sakshaug, Egil; Johnsen, Geir; Kovacs, Kit M.. (2009) Ecosystem Barents Sea. Tapir Akademisk Forlag Tapir Akademisk Forlag
    Non-fiction book
  • Sakshaug, Egil; Johnsen, Geir. (2005) Algal cultures, Analogues of Blooms and Applications. Multi-Science Publishing Multi-Science Publishing
    Academic anthology/Conference proceedings
  • Syvertsen, E.; Hegseth, E; Johnsen, Geir; Sakshaug, Egil; Gulliksen, B; Lønne, O. J. (1992) Livet i isen (The life in the ice). In Økosystem Barentshavet. [Mangler utgivernavn]
    Non-fiction book
  • Sakshaug, Egil; Kristiansen, S; Syvertsen, E; Eilertsen, H. C; Gilstad, M; Hegseth, E. N. (1992) Planktonalger (Phytoplankton). In Økosystem Barentshavet. [Mangler utgivernavn]
    Non-fiction book

Part of book/report

  • Berge, Jørgen; Johnsen, Geir; Last, Kim; Cohen, Jonathan H.; McKee, David. (2024) Light in polar regions. Orkana Forlag
    Chapter
  • Zolich, Artur Piotr; Faltynkova, Andrea; Johnsen, Geir; Johansen, Tor Arne. (2022) Portable Catamaran Drone - an uncrewed sampling vehicle for micro-plastics and aquaculture research.
    Academic chapter/article/Conference paper
  • Berge, Jørgen; Johnsen, Geir; Cohen, Jonathan H.. (2020) Introduction. Springer
    Introduction
  • Johnsen, Geir; Leu, Eva; Gradinger, Rolf. (2020) Marine Micro- and Macroalgae in the Polar Night. Springer
    Academic chapter/article/Conference paper
  • Cohen, Jonathan H.; Berge, Jørgen; Moline, Mark A.; Johnsen, Geir; Zolich, Artur Piotr. (2020) Light in the Polar Night. Springer
    Academic chapter/article/Conference paper
  • Berge, Jørgen; Johnsen, Geir. (2020) Life and Light at the Dead of Night. Springer
    Academic chapter/article/Conference paper
  • Johnsen, Geir; Mogstad, Aksel Alstad; Berge, Jørgen; Cohen, Jonathan H.. (2020) Operative Habitat Mapping and Monitoring in the Polar Night. Springer
    Academic chapter/article/Conference paper
  • Pavlov, Alexey K.; Leu, Eva; Hanelt, Dieter; Bartsch, Inka; Karsten, Ulf; Hudson, Stephen. (2019) The Underwater Light Climate in Kongsfjorden and Its Ecological Implications. Springer
    Academic chapter/article/Conference paper
  • Zolich, Artur Piotr; De La Torre, Pedro R.; Rodwell, Shane; Geoffroy, Maxime; Johnsen, Geir; Berge, Jørgen. (2018) An ice-tethered buoy for fish and plankton research. IEEE conference proceedings
    Academic chapter/article/Conference paper
  • Ludvigsen, Martin; Thorsnes, Terje; Hansen, Roy Edgar; Sørensen, Asgeir Johan; Johnsen, Geir; Lågstad, Petter Arthur. (2015) Underwater vehicles for environmental management in coastal areas. IEEE conference proceedings
    Academic chapter/article/Conference paper
  • Ødegård, Øyvind; Ludvigsen, Martin; Johnsen, Geir; Sørensen, Asgeir Johan; Ekehaug, Stefan; Dukan, Fredrik. (2014) Managing data from multiple sensors in an interdisciplinary research cruise. Amsterdam University Press
    Academic chapter/article/Conference paper
  • Johnsen, Geir; Volent, Zsolt; Dierssen, Heidi; Pettersen, Ragnhild; Ardelan, Murat Van; Søreide, Fredrik. (2013) Underwater hyperspectral imagery to create biogeochemical maps of seafloor properties. Woodhead Publishing Limited
    Academic chapter/article/Conference paper
  • Ludvigsen, Martin; Johnsen, Geir; Lågstad, Petter Arthur; Sørensen, Asgeir Johan; Ødegård, Øyvind. (2013) Scientific operations combining ROV and AUV in the Trondheim Fjord. IEEE conference proceedings
    Academic chapter/article/Conference paper
  • Brunet, Christophe; Johnsen, Geir; Lavaud, Johan; Roy, Suzanne. (2011) Pigments and photoacclimation processes. Cambridge University Press
    Academic chapter/article/Conference paper
  • Johnsen, Geir; Bricaud, Annick; Nelson, Norman; Prézelin, Barbara; Bidigare, Robert. (2011) In vivo bio-optical properties of phytoplankton pigments. Cambridge University Press
    Academic chapter/article/Conference paper
  • Johnsen, Geir; Moline, Mark; Pettersson, Lasse H.; Pinckney, J. L.; Pozdnyakov, Dmitry; Egeland, Einar Skarstad. (2011) Optical monitoring of phytoplankton bloom pigment signatures. Cambridge University Press
    Academic chapter/article/Conference paper
  • Roy, Suzanne; Llewellyn, Carole; Egeland, Einar Skarstad; Johnsen, Geir. (2011) Acknowledgements. Cambridge University Press
    Other
  • Roy, Suzanne; Llewellyn, Carole; Egeland, Einar Skarstad; Johnsen, Geir. (2011) Preface. Cambridge University Press
    Foreword
  • Llewellyn, Carole A.; Roy, Suzanne; Johnsen, Geir; Egeland, Einar Skarstad; Chauton, Matilde ; Hallegraeff, Gustaff. (2011) Perspectives on future directions. Cambridge University Press
    Academic chapter/article/Conference paper
  • von Quillfeldt, Cecilie H.; Hegseth, Else Nøst; Johnsen, Geir; Sakshaug, Egil; Syvertsen, Erik. (2009) Ice algae. Tapir Akademisk Forlag
    Academic chapter/article/Conference paper
  • von Quillfeldt, Cecilie; Hegseth, Else Nøst; Johnsen, Geir; Sakshaug, Egil; Syvertsen, Erik E.. (2009) Ice algae. Tapir Akademisk Forlag
    Academic chapter/article/Conference paper
  • Quillfeldt, C.v.; Hegseth, E.N.; Johnsen, Geir; Sakshaug, E.; Syvertsen, E.E.. (2009) Ice algae. Tapir Akademisk Forlag
    Academic chapter/article/Conference paper
  • Sakshaug, E.; Johnsen, Geir; Volent, Z. (2009) Light. Tapir Akademisk Forlag
    Academic chapter/article/Conference paper
  • Johnsen, Geir; Volent, Z; Sakshaug, E.; Sigernes, Fred; Pettersson, L.H.. (2009) Remote sensing in the Barents Sea. Tapir Akademisk Forlag
    Academic chapter/article/Conference paper
  • Sakshaug, E.; Johnsen, Geir; Kristiansen, Svein; Quillfeldt, C.v.; Rey, F.; Slagstad, D.. (2009) Phytoplankton and primary production. Tapir Akademisk Forlag
    Academic chapter/article/Conference paper
  • Sakshaug, Egil; Johnsen, Geir; Kristiansen, Svein; von Quillfeldt, Cecilie; Rey, Francisco; Slagstad, Dag. (2009) Phytoplankton and primary production. Tapir Akademisk Forlag
    Academic chapter/article/Conference paper
  • Johnsen, Geir; Volent, Zsolt; Sakshaug, Egil; Sigernes, Fred; Pettersson, Lasse H.. (2009) Remote sensing in the Barents Sea. Tapir Akademisk Forlag
    Academic chapter/article/Conference paper
  • Sakshaug, Egil; Johnsen, Geir; Volent, Z.. (2009) Light. Tapir Akademisk Forlag
    Academic chapter/article/Conference paper
  • Sakshaug, Egil; Johnsen, Geir. (2005) Absorption, fluorescence excitation and photoacclimation in phytoplankton. Multi-Science Publishing
    Academic chapter/article/Conference paper
  • Johnsen, Geir; Samset, O.; Sakshaug, Egil. (1998) Bio-optical classification of potential harmful chlorophyll c -containing prymnesiophyte blooms in Scandinavian water.
    Academic chapter/article/Conference paper
  • Johnsen, Geir; Volent, Z.; Tangen, K.; Sakshaug, Egil. (1997) Time series of harmful and benign phytoplankton blooms in northwest European waters using the Seawatch buoy system.
    Academic chapter/article/Conference paper
  • Johnsen, Geir; Volent, Z.; Tangen, K.; Sakshaug, Egil. (1997) Time series of harmful and benign phytoplankton blooms in northwest European waters using the Seawatch buoy system.
    Academic chapter/article/Conference paper

Report

  • Førde, Hedda; Grant, Stephen Denis; Viljanen, Martta; Majaneva, Sanna Kristiina; Johnsen, Geir. (2024) Glow and Know – Evaluating the Potential of Spectral Bioluminescence as a Tool for Zooplankton Identification in situ. NTNU
    Masters thesis
  • Five, Taran; Majaneva, Sanna Kristiina; Viljanen, Martta; Grant, Stephen Denis; Johnsen, Geir. (2024) Studying Behavioral Responses to Bioluminescence in Zooplankton. NTNU
    Masters thesis
  • Svendsen, Thea; Majaneva, Sanna Kristiina; Majaneva, Markus; Båtnes, Anna Solvang; Johnsen, Geir. (2023) The usability of eDNA to identify and quantify zooplankton communities. NTNU
    Masters thesis
  • Krohn-Pettersen, Gitte; Majaneva, Sanna Kristiina; Viljanen, Martta; Grant, Stephen Denis; Johnsen, Geir. (2023) Blinks in the dark - Detecting and characterizing flash kinetics of bioluminescence for in situ species recognition of zooplankton. NTNU
    Masters thesis
  • Bjerkvoll, Mikkel; Johnsen, Geir; Bakken, Torkild; Mogstad, Aksel Alstad. (2022) Aerial and underwater hyperspectral imagery for shallow benthic nature type mapping. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Masters thesis
  • Søreng, Marte Opsahl; Johnsen, Geir; Bakken, Torkild; Mogstad, Aksel Alstad; Gryte, Kristoffer. (2022) Mapping of Zostera Habitat in the Sublittoral Zone using Underwater Hyperspectral Imaging and Unmanned Surface Vehicle. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Masters thesis
  • Marnor, Camilla Mult; Johnsen, Geir; Bakken, Torkild; Mogstad, Aksel Alstad. (2022) Mapping distribution patterns of brittle stars using ROV-based imaging. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Masters thesis
  • Johnsen, Geir; Aberle-Malzahn, Nicole; Fragoso, Glaucia; Thu, Maren. (2022) Phytoplankton Spring Bloom Mapping in Coastal Areas Using Autonomous Underwater Vehicle (AUV) and Optical Approaches. NTNU
    Masters thesis
  • Nøland, Annecken; Johnsen, Geir; Aberle-Malzahn, Nicole. (2022) Autonomous Underwater Vehicle (AUV) based study of zooplankton communities, using a silhouette camera and artificial intelligence. NTNU
    Masters thesis
  • Nevstad, Malin Bø; Johnsen, Geir; Bakken, Torkild; Larsen, Martin Kvisvik; Mogstad, Aksel Alstad. (2022) Use of different imaging systems for ROV-based mapping of complex benthic habitats. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Masters thesis
  • Mogstad, Aksel Alstad; Johnsen, Geir; Sørensen, Asgeir Johan; Ludvigsen, Martin. (2021) Underwater hyperspectral imaging as a tool for benthic habitat mapping. Doktoravhandlinger ved NTNU (2021/271)
    Doctoral dissertation
  • Ringvold, Halldis; Johnsen, Geir; Andersen, Tom. (2021) Studies on Echinodermata from the NE Atlantic Ocean - Spatial distribution and abundance of Asteroidea, including taxonomic and molecular studies on Crossaster and Henricia genera - Value-chain results, including test fishery, biology, market and nutritional analysis on Parastichopus tremulus (Holothuroidea) from the Norwegian coast. Doktoravhandlinger ved NTNU (2021-254)
    Doctoral dissertation
  • Graham, Lisa Kristine Hernandez; Johnsen, Geir; Christensen-Dalsgaard, Signe. (2019) A pilot study assessing drones for mapping and monitoring of European shags. Institutt for biologi, NTNU
    Masters thesis
  • Ødegård, Øyvind; Sørensen, Asgeir Johan; Johnsen, Geir; Ludvigsen, Martin; Hansen, Roy Edgar; Maarleveld, Thijs. (2018) Towards Autonomous Operations and Systems in Marine Archaeology. Doktoravhandlinger ved NTNU (IMT-12)
    Doctoral dissertation
  • Nornes, Stein Melvær; Sørensen, Asgeir Johan; Ludvigsen, Martin; Johnsen, Geir; Schjølberg, Ingrid; Ånonsen, Kjetil Bergh. (2018) Guidance and Control of Marine Robotics for Ocean Mapping and Monitoring. Doktoravhandlinger ved NTNU (2018:202)
    Doctoral dissertation
  • Strømsholm, Jørgen; Johnsen, Geir; Ludvigsen, Martin. (2018) Eyes beneath the surface - using a miniROV to reveal habitat and dietary choices of the European shag. NTNU MSc thesis
    Masters thesis
  • Kauko, Hanna Maria; Johnsen, Geir; Assmy, Phillipp. (2018) Light response and acclimation of macroalgae in a changing Arctic. Doktoravhandlinger ved NTNU (2018)
    Doctoral dissertation
  • Fjærtoft, Kaja Lønne; Bakken, Torkild; Johnsen, Geir; Ludvigsen, Martin. (2018) Macroalgal detritus: Physical variables and impacts on the benthic macrofaunal community. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Masters thesis
  • Paulsen, Emil; Bakken, Torkild; Ramirez-Llodra, Eva; Johnsen, Geir. (2017) Community structure and biodiversity of the benthic megafauna at the inactive hydrothermal site Mohn's Treasure, on the Mohn's Ridge, Arctic Mid-Ocean Ridge (AMOR) . Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Masters thesis
  • Alvsvåg, Dora Marie; Johnsen, Geir; Bakken, Torkild; Ludvigsen, Martin; Berge, Jørgen. (2017) Mapping of a seagrass habitat in Hopavågen, Sør-Trøndelag, with the use of an Autonomous Surface Vehicle combined with optical techniques. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Masters thesis
  • Kamilla, Sporsheim; Sporsheim, Kamilla; Johnsen, Geir; Reitan, Kjell Inge; Evertsen, Antii Jussi. (2017) Astaxanthin as a biomarker for fish feed loading in the marine ecosystem. NTNU, Trondheim
    Masters thesis
  • Johnsen, Geir; Sandbu, Marthe; Assmy, Philipp. (2017) High Arctic Sea-Ice Algae: The Use of Rapid Light Curves to Assess Photosynthetic Performance of Different Ice-Algal Communities. Master science NTNU
    Masters thesis
  • Kjeken, John; Johnsen, Geir; Ludvigsen, Martin; Thorsnes, Terje; Lågstad, Petter Arthur. (2017) The growth of benthic organisms in a dumping ground for military bombs and munitions. NTNU, Trondheim
    Masters thesis
  • Mynors, Julie; Johnsen, Geir; Wernand, Marcel; Volent, Zsolt. (2017) Ocean Colour and Phytoplankton Dynamics - An examination of the Forel-Ule scale in a modern context. NTNU Trondheim
    Masters thesis
  • Andersson, Ingvild Henriette Kristin; Johnsen, Geir; Bakken, Torkild; Ludvigsen, Martin. (2017) Bio-optical diversity on cold water coral habitats. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Masters thesis
  • Håpnes, Sverre Julian; Johnsen, Geir; Ludvigsen, Martin; Lågstad, Petter Arthur. (2016) Mapping of demersal fish and benthos by AUV equipped with optical and acoustic imagers at 600 m depth in Trondheimsfjorden. NTNU MSc
    Masters thesis
  • Liefmann, Stephanie; Johnsen, Geir; Järnegren, Johanna. (2016) Eco-physiological responses of cold-water corals to anthropogenic sedimentation and particle shape. NTNU Mastergrad
    Masters thesis
  • Jakobsen, June; Johnsen, Geir; Bakken, Torkild; Ludvigsen, Martin; Karlsen, Svein. (2016) The Tautra Cold-Water Coral Reef - Mapping and describing the biodiversity of a cold-water coral reef ecosystem in the Trondheimsfjord by use of multi-beam echo sounding and video mounted on a remotely operated vehicle. NTNU
    Masters thesis
  • Kjerstad, Ingrid; Johnsen, Geir; Sørensen, Asgeir Johan; Bakken, Torkild. (2014) Underwater Imaging and the effect of Inherent Optical Properties on image quality. NTNU
    Masters thesis
  • Hatlebakk, Maja; Johnsen, Geir; Søreide, Janne. (2014) Effect of lipids and fatty acid composition on success of reproduction in Calanus glacialis. NTNU
    Masters thesis
  • Valle, Kristin Collier; Johnsen, Geir; Bones, Atle M. (2014) Photoacclimation mechanisms and light responses in marine micro- and macroalgae. NTNU
    Doctoral dissertation
  • Hallerud, Charlotte; Johnsen, Geir; Aamot, Inga. (2014) Pigment composition of macroalgae from a Norwegian kelp forest. NTNU
    Masters thesis
  • Lund, Lene; Johnsen, Geir; Bakken, Torkild; Gabrielsen, Tove. (2014) Morphological diversity in Laminaria digitata - different species or different phenotypes?. Norwegian University of Science and Technology, Department of Biology
    Masters thesis
  • Førde, Henny; Reitan, Kjell Inge; Johnsen, Geir. (2014) Development of bryozoan fouling on cultivated kelp (Saccharina latissima) in Norway. NTNU
    Masters thesis
  • Kvernvik, Ane Cecilie; Johnsen, Geir; Aamot, Inga. (2014) How lamina age influence photosynthetic response to light variations in Saccharina latissima. NTNU
    Masters thesis
  • Kleiven, Wanda; Johnsen, Geir; Ardelan, Murat Van. (2014) Elemental composition in various marine brown, green and red macro algae with respect to season and tissue age. NTNU
    Masters thesis
  • Eldevik, Tor; Reigstad, Marit; Falck, Eva; Gerland, Sebastian; Jentoft, Sissel; Johnsen, Geir. (2014) Arven efter Nansen. Forskningsplan for det sentrale og nordlige Barentshavet. UiT Norges arktiske universitet UiT Norges arktiske universitet
    Report
  • Bones, Atle M.; Johnsen, Geir; Brembu, Tore; Valle, Kristin Collier. (2014) Photoacclimation mechanisms and light responses in marine micro- and macroalgae. Doktoravhandlinger ved NTNU (74)
    Doctoral dissertation
  • Ingrid, Hansen; Johnsen, Geir; Sørensen, Asgeir Johan. (2013) Optical Mapping of Cold-water Corals in Trondheimsfjorden and Svalbard. NTNU
    Masters thesis
  • Johnsen, Geir; Sørensen, Asgeir Johan; Ekehaug, Stefan. (2013) The use of side scan and synthetic aperture sonar mounted on autonomous underwater vehicles for biological habitat mapping. MSc Thesis (2013)
    Masters thesis
  • Pettersen, Ragnhild; Johnsen, Geir. (2013) Identification of marine organisms using Chemotaxonomy and Hyperspectral imaging. Doktoravhandlinger ved NTNU (292)
    Doctoral dissertation
  • Båtnes, Anna Solvang; Johnsen, Geir. (2013) Light in the dark – the role of irradiance in the high Arctic marine ecosystem during polar night. Doktoravhandlinger ved NTNU (151)
    Doctoral dissertation
  • Bones, Atle M.; Johnsen, Geir; Brembu, Tore; Nymark, Marianne. (2013) Light responses in the marine diatom Phaeodactylum tricornutum. Doktoravhandlinger ved NTNU (378)
    Doctoral dissertation
  • Bjørdalsbakke, Lise Kristin; Johnsen, Geir; Bakken, Torkild; Berge, Jørgen. (2012) Population structure, parasitism and prey preference in Sclerocrangon boreas and S. ferox, Svalbard. NTNU
    Thesis at a second degree level
  • Fremstedal, Ane Sofia Viset; Bruheim, Per; Sletta, Håvard; Johnsen, Geir. (2012) Utvikling og optimalisering av protokoll for massespektrometrisk metabolsk profilering av adherente humane celler. NTNU Master theses
    Masters thesis
  • Belseth, Elen; Johnsen, Geir; Berge, Jørgen. (2012) Eco-physiology of the Arctic kelp Laminaria solidungula. NTNU Master thesis
    Masters thesis
  • Hovland, Erlend Kjeldsberg; Johnsen, Geir; Sakshaug, Egil; Folkestad, Are. (2012) Bio-optics and ecology in Emiliania huxleyi blooms: Field and remote sensing studies in Norwegian water. NTNU
    Doctoral dissertation
  • Andersen, Hanne Kile; Johnsen, Geir; Bakken, Torkild. (2011) Gastropods Associated with Laminaria hyperborea and Saccorhiza polyschides in a Norwegian Kelp Forest: Comparison of Sampling and In Situ Imaging Techniques. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Masters thesis
  • Øye, Ane-Marte; Johnsen, Geir. (2009) Photobioreactor time-series of a simulated bloom of Emiliania huxleyi. NTNU, Institutt for biologi
    Masters thesis
  • Johnsen, Geir; Nepstad, Ina. (2009) Cloning and characterisation of interleukin-6 and interleukin-11b in Atlantic halibut (Hippoglossus hippoglossus). NTNU, Institutt for biologi
    Masters thesis
  • Thoen, Hanne Halkinrud; Johnsen, Geir. (2009) Pigmentation in the Arctic deep-sea amphipods Eurythenes gryllus and Anonyx sp. NTNU, Institutt for biologi
    Masters thesis
  • Elde, Anette Cecilie; Johnsen, Geir. (2009) Pigmentation in deep-water corals from the Trondheimsfjord, Norway. NTNU, Institutt for biologi
    Masters thesis
  • Båtnes, Anna Solvang; Johnsen, Geir. (2008) Trophic interaction between little auks and their zooplankton prey in a high Arctic fjord based on lipid analyses. NTNU, Institutt for biologi
    Masters thesis
  • Johnsen, Geir; Volent, Zsolt; Sigernes, F.. (2007) Fine scale studies using hyper-spectral remote sensing. ESSAS Meeting in Marine Arctic Climate
    Report
  • Johnsen, Geir; Volent, Zsolt; Sigernes, F.; Berge, Jørgen; Hovland, Erlend Kjeldsberg; Sakshaug, Egil. (2007) Local hyperspectral imaging of ocean colour from tethered balloons in the Arctic. In Proceedings from Arctic Frontiers: Balancing human use and ecosystem protection. UiT Norges arktiske universitet UiT Norges arktiske universitet
    Report
  • Hancke, Kasper; Johnsen, Geir. (2007) Photosynthetic responses as a function of light and temperature: Field and laboratory studies on marine microalgae. NTNU, Institutt for biologi
    Doctoral dissertation
  • Hancke, Kasper; Johnsen, Geir; Sakshaug, Egil. (2007) Bio-optical properties and spectral attenuation of photosynthetically available radiation: relation to primary productivity and phytoplankton composition. In Proceedings from Arctic Frontiers: balancing human use and ecosystem protection. UiT Norges arktiske universitet UiT Norges arktiske universitet
    Report
  • Berge, Jørgen; Schander, C; Pampanin, D.M.; Johnsen, Geir. (2007) The past, present and future of the Mytilus edulis population on Svalbard. In Proceedings from Arctic Frontiers: Balancing human use and ecosystem protection. UiT Norges arktiske universitet UiT Norges arktiske universitet
    Report
  • Stübner, Eike; Johnsen, Geir. (2007) Biogeographical distribution of temperate vs. Arctic benthic species around Svalbard. NTNU, Institutt for biologi
    Masters thesis
  • Pettersen, Ragnhild; Johnsen, Geir. (2007) Phytoplankton systematics and pigmentation in the Arctic. NTNU, Institutt for biologi
    Masters thesis
  • Hovland, Erlend Kjeldsberg; Sakshaug, Egil; Johnsen, Geir. (2007) Tracing Coccolithophorid Blooms in the Barents Sea Using MODIS Level-3 Imagery. NTNU, Institutt for biologi
    Masters thesis
  • Elvestrand, Jostein; Johnsen, Geir; Sneli, Jon-Arne. (2007) Morphometry and patterns of growth in Acesta excavata (Bivalvia: Limidae) from the Trondheimsfjord, Norway. NTNU, Institutt for biologi
    Thesis at a second degree level
  • Kleiven, Mona; Johnsen, Geir. (2007) Pigmentation in Halocynthia pyriformis from Isfjorden, Spitsbergen. NTNU, Institutt for biologi
    Masters thesis
  • Roy, Suzanne; Egeland, Einar Skarstad; Johnsen, Geir; Llewellyn, Carole; Wright, Simon. (2006) Report of a Workshop on a Follow-Up Volume of the Book "Phytoplankton Pigments in Oceanography". Scientific Committee on Oceanic Research
    Report
  • Sylling, Guro; Thingstad, Per Gustav; Johnsen, Geir. (2006) Marin bunndyrfauna (Gastropoda, Bivalvia) - Konsekvenser av åpning av veifylling over Ramsarområdet Tautrasvaet. NTNU, Institutt for biologi
    Masters thesis
  • Carlsen, Beth Paludan; Johnsen, Geir. (2006) Makroepifauna associeret med Laminaria digitata og L. saccharina, Svalbard. NTNU, Institutt for biologi
    Masters thesis
  • Hilstad, Kari; Johnsen, Geir. (2005) In situ tidsseriemålinger av lyshøstingsegenskaper og cellekjemi hos marine makroalger i Trondheimsfjorden. NTNU, Institutt for biologi
    Thesis at a second degree level
  • Olsen, Lasse Mork; Johnsen, Geir. (2005) Interactions between marine osmo- and phagotrophs in different physicochemical environments. NTNU, Institutt for biologi
    Doctoral dissertation
  • Valle, Kristin Collier; Johnsen, Geir. (2005) Detection of monthly variation in marine red, brown and green macroalgae by means of in situ video, epifluorescence microscopy and numerical digital image analysis. NTNU, Institutt for biologi
    Thesis at a second degree level
  • Chauton, Matilde Skogen; Johnsen, Geir; Sakshaug, Egil. (2005) Nuclear Magnetic Resonance spectroscopy of marine microalgae: Metabolic profiling and species discrimination from High-resolution Magic Angle Spinning NMR analysis of whole-cell samples. NTNU, Institutt for biologi
    Doctoral dissertation
  • Hancke, Torunn Beate; Johnsen, Geir. (2004) SISCAL processor evaluation document. www.siscal.net
    Report
  • Johansen, Torunn Beate; Johnsen, Geir. (2002) End User requirement evaluation document. [Mangler utgivernavn]
    Report
  • Johansen, Torunn Beate; Johnsen, Geir. (2002) End User Requirements document. [Mangler utgivernavn]
    Report
  • Johnsen, Geir. (2001) SISCAL End User Requirement Satellite-based Information System on Coastal Areas and Lakes. Information Society Technologies Programme funded by the European Comm
    Report
  • Johnsen, Geir. (1994) Light Harvesting and Utiliation in Marine Phytoplankton: Species-Specific and Photoadaptive Responses. Dr. Scient. Thesis in Marine Botany, University of Trondheim
    Doctoral dissertation

UTSTILLING

  • Berge, Jørgen; Johnsen, Geir. (2020) • Polar Night Exhibitions in Russia 2020. Kaliningrad – World Ocean Museum.
    Museum exhibition
  • Berge, Jørgen; Johnsen, Geir. (2020) Polar Night exhibition in Karelia (Petrozavodsk, Russia): 03.03 – 03.04.2020 . Polar Night exhibition, Karelia (Petrozavodsk, Russia). March-April 2020
    Museum exhibition
  • Berge, Jørgen; Johnsen, Geir; Tandberg, Anne helene. (2017) Polar night - Life and light in the dead of night. Russian Science Week - Lomonosov Moscow State University
    Museum exhibition
  • Gätzschmann, Per; Hårsaker, Karstein; Johnsen, Geir; Leite, Stein Roar; Pedersen, Solbjørg; Sørumgård, Marit. (2016) Nye oppdagelser i polarnatta - video. Polarnatt
    Museum exhibition
  • Johnsen, Geir; Berge, Jørgen; Sørensen, Asgeir Johan; Sørumgård, Marit; Sandbakk, Elin; Johnsen, Tobias Kvendseth. (2016) Polarnatt/Polar Night - ny utstilling med nyheter fra 2015-2016. Polarnattsutstilling ved Vitenskapsmuseet NTNU
    Museum exhibition
  • Tandberg, Anne Helene S.; Berge, Jørgen; Johnsen, Geir; Aarekol, Lena. (2015) POLARNATT - liv og lyst i mulm og mørke. Polarnatt - liv og lyst i mulm og mørke
    Museum exhibition
  • Berge, Jørgen; Johnsen, Geir. (2015) Polarnatt - Liv og lys i mulm og mørke Polar night - life and light in the dead of night. Utstilling på Polarmuseet i Tromsø
    Museum exhibition
  • Aarekol, Lena; Johnsen, Geir; Berge, Jørgen. (2015) Polarnatt. Liv og lys i mulm og mørke Polarnighth. Life and death in dead of night. Utstilling
    Museum exhibition
  • Berge, Jørgen; Johnsen, Geir; Aarekol, Lena. (2015) Life and light in the dead of night. Museumsutstilling
    Museum exhibition

PRODUKT

  • Viljanen, Martta; Førde, Hedda; Majaneva, Sanna Kristiina; Grant, Stephen Denis; Johnsen, Geir. (2024) Zooplankton spectral bioluminescence database.
    Database
  • Anderson, Philip; Berge, Jørgen; Granskog, Mats A.; Divine, Dmitry V; Katlein, Christian; Itkin, Polona. (2023) Upwelling and downwelling visible radiation measurements of the autonomous ice-tethered OptiCAL 'ee' buoy deployed during MOSAiC in the Sea Ice Ridge Observatory area.
    Other product
  • Anderson, Philip; Berge, Jørgen; Granskog, Mats A.; Divine, Dmitry V; Katlein, Christian; Itkin, Polona. (2023) Upwelling and downwelling visible radiation measurements of the autonomous ice-tethered OptiCAL 'gg' buoy deployed during MOSAiC in the Monster Bay area.
    Other product
  • Anderson, Philip; Berge, Jørgen; Granskog, Mats A.; Divine, Dmitry V; Katlein, Christian; Itkin, Polona. (2023) Upwelling and downwelling visible radiation measurements of the autonomous ice-tethered OptiCAL 'hh' buoy deployed during MOSAiC in the Dark site Second Year Ice. .
    Other product
  • Berge, Jørgen; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Johnsen, Geir. (2021) Time series (2018) of irradiance in the PAR (photosynthetically active radiation) region measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) derived from an USSIMO spectroradiometer. .
    Other product
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Pictures from an all-sky camera with hourly resolution from the light observatory at Ny-Ålesund, Svalbard, Norway (complete year 2019).
    Other product
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Pictures from an all-sky camera with hourly resolution from the light observatory at Ny-Ålesund, Svalbard, Norway (complete year 2017).
    Other product
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Pictures from an all-sky camera with hourly resolution from the light observatory at Ny-Ålesund, Svalbard, Norway (complete year 2020).
    Other product
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Pictures from an all-sky camera with hourly resolution from the light observatory at Ny-Ålesund, Svalbard, Norway (complete year 2018).
    Other product
  • Berge, Jørgen; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Johnsen, Geir. (2021) USSIMO spectroradiometer raw data time series (2018) measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway).
    Other product
  • Berge, Jørgen; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Johnsen, Geir. (2021) USSIMO spectroradiometer raw data time series (2019) measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway).
    Other product
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Time series (2020) of irradiance in the PAR (photosynthetically active radiation) region measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) derived from SLR camera.
    Other product
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Time series (2017) of irradiance in the PAR (photosynthetically active radiation) region measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) derived from SLR camera.
    Other product
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Photosynthetic active radiation (PAR) time series measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway).
    Other product
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Time series (2019) of irradiance in the PAR (photosynthetically active radiation) region measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) derived from SLR camera.
    Other product
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Time series (2018) of irradiance in the PAR (photosynthetically active radiation) region measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) derived from SLR camera.
    Other product
  • Berge, Jørgen; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Johnsen, Geir. (2021) Time series (2017) of irradiance in the PAR (photosynthetically active radiation) region measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) derived from an USSIMO spectroradiometer.
    Other product
  • Berge, Jørgen; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Johnsen, Geir. (2021) USSIMO spectroradiometer raw data time series (2017) measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) .
    Other product
  • Berge, Jørgen; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Johnsen, Geir. (2021) Time series (2020) of irradiance in the PAR (photosynthetically active radiation) region measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) derived from an USSIMO spectroradiometer.
    Other product
  • Berge, Jørgen; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Johnsen, Geir. (2021) Time series (2019) of irradiance in the PAR (photosynthetically active radiation) region measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) derived from an USSIMO spectroradiometer.
    Other product
  • Berge, Jørgen; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Johnsen, Geir. (2021) USSIMO spectroradiometer raw data time series (2020) measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway).
    Other product

INFORMASJONSMATR

  • Oftedahl, Live; Sørensen, Asgeir Johan; Johnsen, Geir. (2023) NTNUs first research satellite on the first mission in the Arctic.
    Website (informational material)
  • Oftedahl, Live; Ødegård, Øyvind; Sørensen, Asgeir Johan; Johnsen, Geir. (2022) Oppdrag Mjøsa får internasjonal oppmerksomhet.
    Website (informational material)

Teaching

Courses

  • BI3910 - Master Thesis in Ocean Resources
  • BI3070 - Muliggjørende teknologi for marine økologiske studier og marin vitenskap
  • BI3911 - Master thesis in MSAQUAH Health Management in Aquaculture
  • BI3061 - Biologisk oseanografi
  • BI8075 - Muliggjørende teknologi for marine økologiske studier og marin vitenskap
  • BI2060 - Marin økologi
  • BI2036 - Marin biodiversitet
  • BI8061 - Biologisk oseanografi
  • BI8091 - Avansert biologi
  • BI3062 - Forskningsseminar, marin

Outreach

2024

  • Lecture
    Singh, Asmita; Sanchez Puerto, Nicolas; Moreira Fragoso, Glaucia; Garrett, Joseph Landon; Johnsen, Geir; Johansen, Tor Arne. (2024) The Observational Pyramid: Unravelling the Physical and Biogeochemical Processes in the Remote Polar Oceans. National Institute of Oceanography Surface Ocean Lower Atmosphere (SOLAS) conference , Goa, India 2024-11-10 - 2024-11-14
  • Poster
    Singh, Asmita; Sanchez Puerto, Nicolas; Moreira Fragoso, Glaucia; Garrett, Joseph Landon; Johnsen, Geir; Johansen, Tor Arne. (2024) Decoding Oceanic Mysteries: The Observational Pyramid for Insights into the Physical and Biogeochemical Changes in the Remote Polar Oceans. Framsenteret, Norsk Polarinstitutt Antarktisseminaret 2024 , Tromsø, Norge 2024-05-07 - 2024-05-08
  • Poster
    Viljanen, Martta; Five, Taran; Daase, Malin Hildegard Elisabeth; Hatlebakk, Maja Karoline Viddal; Johnsen, Geir; Majaneva, Sanna Kristiina. (2024) Species-specific light reactions of Arctic Calanus copepods revealed by AI assisted tracking. International Society of Neuroethology 15th International Congress of Neuroethology , Berlin 2024-07-28 - 2024-08-02
  • Poster
    Paiba García, Laura Catherine; Johnsen, Geir; Bakken, Torkild. (2024) Biological diversity in the Norwegian basin: insights for the management of deep-sea mining. The Nordic Society Oikos (NSO) Nordic OIKOS 2024 , Lund 2024-03-12 - 2024-03-15
  • Academic lecture
    Paiba García, Laura Catherine; Johnsen, Geir; Bakken, Torkild. (2024) The deep-sea: in numbers and pictures (related to deep-sea mining). NTNU Ocean Club NTNU Ocean talks , NTNU - Trondheim 2024-04-25 -
  • Academic lecture
    Bakken, Sivert; Johnsen, Geir; Johansen, Tor Arne. (2024) First Look at Mondrian Forests for Hyperspectral Secchi Depth Estimation. EARSeL 13th EARSeL Workshop on Imaging Spectroscopy , Valencia, Spain 2024-04-16 - 2024-04-18
  • Poster
    Singh, Asmita; Sanchez Puerto, Nicolas; Moreira Fragoso, Glaucia; Garrett, Joseph Landon; Johnsen, Geir; Johansen, Tor Arne. (2024) Enhancing Remote Polar Ocean Monitoring: Applying the Observational Pyramid for Improved Climate Insights. Digital Life Norway Digital Life Norway: Research School Conference , Oslo, Norge 2024-10-14 - 2024-10-16
  • Lecture
    Finstad, Anders Gravbrøt; Bakken, Torkild; Moreira Fragoso, Glaucia; Johnsen, Geir. (2024) Trondheimsfjorden, hva nå?. NTNU Hav og kyst Hovedutvalg for natur, klima og beredskap, Trøndelag fylkeskommune , Trondheim 2024-11-20 - 2024-11-20
  • Poster
    Nevstad, Malin Bø; Johnsen, Geir; Bakken, Torkild; Løvås, Håvard Snefjellå. (2024) Using the observational pyramid for mapping of norwegian seagrass habitats. The Oceanography Society (TOS) Ocean Optics 2024 , Las Palmas De Gran Canaria 2024-10-06 - 2024-10-11
  • Poster
    Paiba Garcia, Laura Catherine; Johnsen, Geir; Bakken, Torkild. (2024) Exploring deep-sea benthos in the Greenland and Norwegian Seas: what may be affected by deep-sea mining?. British Ecological Society British Ecological Conference 2024 , Liverpool 2024-12-10 - 2024-12-13
  • Academic lecture
    Majaneva, Markus; Viljanen, Martta; Grant, Stephen Denis; Daase, Malin Hildegard Elisabeth; Geoffroy, Maxime; Langbehn, Tom. (2024) Illuminating zooplankton diel vertical migration with eDNA metabarcoding in the polar night. The 7th ICES/PICES Zooplankton Production Symposium 2024-03-17 - 2024-03-22
  • Poster
    Viljanen, Martta; Majaneva, Sanna Kristiina; Majaneva, Markus; Daase, Malin Hildegard Elisabeth; Johnsen, Geir; Donner, Kristian. (2024) Arctic zooplankton in changing marine lightscape. Arctic Frontiers 2024 ACTIONS & REACTIONS , Tromsø/online 2024-01-29 - 2024-02-01
  • Poster
    Viljanen, Martta; Daase, Malin Hildegard Elisabeth; Majaneva, Markus; Donner, Kristian; Lindström, Magnus; Johnsen, Geir. (2024) Arctic zooplankton in changing marine lightscape. The 7th ICES/PICES Zooplankton Production Symposium 2024 , Hobart, Tasmania 2024-03-17 - 2024-03-22
  • Academic lecture
    Majaneva, Markus; Viljanen, Martta; Grant, Stephen Denis; Daase, Malin Hildegard Elisabeth; Geoffroy, Maxime; Langbehn, Tom. (2024) Illuminating zooplankton diel vertical migration with eDNA metabarcoding in the polar night. BioStandards 2024-05-27 - 2024-05-30

2023

  • Poster
    Hatlebakk, Maja Karoline Viddal; Viljanen, Martta; Grant, Stephen Denis; Johnsen, Geir. (2023) Behavioral Response in Calanus Copepods to Change in Ambient Light in the Polar Night. Nansen Legacy project Nansen Legacy symposium: Towards a new Arctic Ocean - Past, Present, Future , Tromsø 2023-11-06 - 2023-11-09
  • Poster
    Reigstad, Marit; Gerland, Sebastian; Eldevik, Tor; Kunisch, Erin; Wiedmann, Ingrid; Sundfjord, Arild. (2023) The Nansen Legacy project invites you to its upcoming international symposium in November 2023. Alaska Marine Science Symposium Alaska Marine Science Symposium , Anchorage, Alaska 2023-01-23 - 2023-01-27
  • Poster
    Lange, Benjamin Allen; Cimoli, Emiliano; Johnsen, Geir; Campbell, Karley Lynn; Osanen, Janina; Anhaus, Philipp. (2023) An Overview of Underwater Hyperspectral Imagery of Sea Ice in the Central Arctic Ocean. Nansen Legacy the Nansen Legacy Symposium , Tromsø, Norway 2023-11-07 - 2023-11-09
  • Academic lecture
    Viljanen, Martta; Daase, Malin Hildegard Elisabeth; Hatlebakk, Maja Karoline Viddal; Johnsen, Geir. (2023) Behavioral light responses vary between different species of Arctic zooplankton. University of Helsinki Visionarium XXI , Tvärminne Zoological Station 2023-09-24 - 2023-09-26
  • Academic lecture
    Geoffroy, Maxime; Langbehn, Tom; McKee, David; Sandbank, Einat; Daase, Malin Hildegard Elisabeth; Vogedes, Daniel Ludwig. (2023) Pelagic organisms avoid artificial light from scientific instruments. Research Council Norway Svalbard Science Conference , Oslo 2023-11-02 - 2023-11-03
  • Academic lecture
    Geoffroy, Maxime; Langbehn, Tom; Mckee, David; Sandbank, Einat; Daase, Malin Hildegard Elisabeth; Vogedes, Daniel Ludwig. (2023) Pelagic organisms avoid white, blue, green, and red artificial light from scientific instruments. ICES ICES Symposium on Fisheries Acoustics , Portland, Maine, United States of America 2023-03-27 - 2023-03-30

2022

  • Lecture
    Oudijk, Esmée; Hasler, Oliver Kevin; Overaas, H; Marty, Sabine; Williamson, David; Svendsen, T. (2022) Campaign For Hyperspectral Data Validation In North Atlantic Coastal Waters. 2022 12th Workshop on Hyperspectral Imaging and Signal Processing: Evolution in Remote Sensing (WHISPERS) 2022-10-13 - 2022-10-16
  • Lecture
    Zolich, Artur Piotr; Faltynkova, Andrea; Johnsen, Geir; Johansen, Tor Arne. (2022) Portable Catamaran Drone - an uncrewed sampling vehicle for micro-plastics and aquaculture research. MTS/IEEE OCEANS 2022-10-17 - 2022-10-20
  • Academic lecture
    Dona, Angela; Evertsen, Jussi; Johnsen, Geir. (2022) Lack of kleptoplast photoacclimation and the role of parapodia in the sacoglossan sea slug Plakobranchus ocellatus. University of Bremen 15th International Coral Reef Symposium , Bremen 2022-08-03 - 2022-08-08

2021

  • Academic lecture
    Geoffroy, Maxime; Langbehn, Tom; Varpe, Øystein; Cohen, Jonathan H.; Cottier, Finlo; Last, Kim S. (2021) Behavioral response of marine fish and zooplankton exposed to artificial light during acoustic surveys. . Arctic Science Summit Week , virtual 2021-03-20 - 2021-03-26
  • Academic lecture
    Geoffroy, Maxime; Langbehn, Tom; Varpe, Øystein; Cohen, Jonathan H.; Cottier, Finlo; Last, Kim S. (2021) In situ experiments reveal behavioral response of marine fish and zooplankton when exposed to artificial light during the Arctic polar night. ICES ICES 2021 Annual Science Conference , virtual 2021-10-06 - 2021-10-10
  • Interview
    Bazilchuk, Nancy; Johnsen, Geir; Berge, Jørgen; Hobbs, Laura; Cohen, Jonathan H.. (2021) Shedding light – on the polar night. By N. Bazilchuk. Krill eyeballs. The werewolf effect. Diel vertical migration. Arctic marine biologists really talk about these things. 63 degrees north (Podcast) 63 degrees north (Podcast) [Internet] 2021-01-27

2020

  • Documentary
    Berge, Jørgen; Johnsen, Geir; Cohen, Jonathan H.. (2020) Forskere I polarnatta- hvor lyst er mørkt?. Framsenteret, Tromsø Framsenteret, Tromsø [Internet] 2020-01-20
  • Documentary
    Berge, Jørgen; Johnsen, Geir; Cohen, Jonathan H.. (2020) Is I sikte. Framsenteret, Tromsø Framsenteret, Tromsø [Internet] 2020-01-20
  • Documentary
    Berge, Jørgen; Johnsen, Geir; Cohen, Jonathan H.. (2020) Mens vi venter på lyset. Framsenteret, Tromsø Framsenteret, Tromsø [Internet] 2020-01-20
  • Documentary
    Berge, Jørgen; Johnsen, Geir; Cohen, Jonathan H.. (2020) Overraskelser I mørket. Framsenteret, Tromsø Framsenteret, Tromsø [Internet] 2020-01-20
  • Documentary
    Snyder, Mike; Berge, Jørgen; Johnsen, Geir; Mckee, David. (2020) “Into the dark” documentary . [TV] 2020-01-01
  • Academic lecture
    Bakken, Sivert; Wei, J; Lee, Z; Johnsen, Geir; Johansen, Tor Arne; Montoya, J. (2020) Hyperspectral Remote Sensing of the Amazon River Plume. Ocean Science Meeting 2020-02-16 - 2020-02-21
  • Academic lecture
    Johnsen, Geir. (2020) Centre of Autonomous Marine Operations & Systems (AMOS) - selcted research activities. NASA Jet Propulsion Laboratory PRIME + EELS Ocean Worlds Arctic Collaboration (OWAC) Workshop 2020-02-26 - 2020-02-28

2019

  • Interview
    Aadland, Camilla; Johnsen, Geir. (2019) Denne lusejegeren har vunnet designpris. Bakgrunnshistorie om grunnleggingen av Ecotone og undervanns hyperspektral avbilding. Fiskeribladet no 10 2019 Fiskeribladet no 10 2019 [Business/trade/industry journal] 2019-01-10
  • Interview
    Hanger, MR; Johnsen, Geir. (2019) Ny forskningsstrategi: Vil markere at Svalbard er norsk. . Forskning.no Forskning.no [Journal] 2019-01-16
  • Documentary
    NTNU, NTNU; Fossum, Trygve Olav; Johnsen, Geir; Fragoso, Glaucia Moreira; Ludvigsen, Martin. (2019) Ocean life in 3-D: Mapping phytoplankton with a smart AUV. . Phys.org Phys.org [Journal] 2019-03-07
  • Documentary
    Johnsgård, Christer; Johnsen, Geir. (2019) I nabolaga våre har vi ei frodig og eksotisk verd som er skjult for dei fleste av oss. Norge nå går saman med dykkarar, fiskarar og marinbiologar under overflata i Trondheimsfjorden, ein fjord som byr på langt meir enn dei fleste er klar over. NRK TV NRK TV [TV] 2019-02-04
  • Academic lecture
    Ødegård, Øyvind; Johnsen, Geir; Sørensen, Asgeir Johan; Ludvigsen, Martin; Geoffroy, Maxime; Berge, Jørgen. (2019) Shipwrecks in the Arctic – knowledge gaps illustrated by a case from Svalbard . ArcticNet ArcticNet Anuual Scientific Meeting 2019 , Halifax 2019-12-02 - 2019-12-05

2018

  • Programme participation
    Berge, Jørgen; Cottier, Finlo; Johnsen, Geir; Kintisch, Eli. (2018) “Thaw” episode 1 of 3 – What melting sea ice means for life in the Arctic. Vox Vox [Internet] 2018-04-09
  • Academic lecture
    Davies, Emlyn John; Fragoso, Glaucia Moreira; Johnsen, Geir; Ellingsen, Ingrid H.. (2018) Combining optics, imaging and artificial intelligence for in-situ characterisation of complex particle populations. AGU AGU Ocean Sciences , Portland 2018-02-11 - 2018-02-16
  • Documentary
    Berge, Jørgen; Cottier, Finlo; Johnsen, Geir; Kintisch, Eli. (2018) “Thaw”, episode 2 of 3 - How a warmer Arctic could intensify extreme weather. Vox Vox [Internet] 2018-04-17
  • Interview
    Johnsen, Geir; Hanger, Mari Rian. (2018) Manglende interesse for å bruke Ny Ålesund for å utdanne neste generasjons polarforskere. . Universitetsavisa Universitetsavisa [Journal] 2018-12-13
  • Interview
    Johnsen, Geir; Hanger, Mari Rian. (2018) Manglende interesse for å bruke Ny Ålesund for å utdanne neste generasjons polarforskere. . Forskning.no Forskning.no [Internet] 2018-12-14
  • Popular scientific lecture
    Johnsen, Geir; Berge, Jørgen. (2018) Polarnatt. SINTEF Polarnatts seminar med muliggjørende teknologi , Trondheim 2018-01-12 - 2018-01-12
  • Popular scientific lecture
    Johnsen, Geir. (2018) Light as a cue for life - Arctic. NTNU Kunstakademiet Kunstakademiet - invitert foredrag , Trondheim 2018-04-05 - 2018-04-05
  • Popular scientific lecture
    Johnsen, Geir; Berge, Jørgen; Sørensen, Asgeir Johan. (2018) Marin polarnatt. Vitensenteret i Trondheim 30 årsjubileum Vitensenteret i Trondheim , Trondheim 2018-03-09 - 2018-03-09
  • Interview
    Sørensen, Asgeir Johan; Johnsen, Tobias Kvendseth; Johnsen, Geir; Tveter, Nina Elisabeth. (2018) Hvordan høres det ut i havdypet. Gemini.no Gemini.no [Journal] 2018-03-14
  • Interview
    Ødegård, Øyvind; Sørensen, Asgeir Johan; Johnsen, Geir; Haugan, Idun. (2018) Slik finner ny teknologi skipsvrak på havets bunn. Gemini.no Gemini.no [Business/trade/industry journal] 2018-07-23
  • Documentary
    Berge, Jørgen; Cottier, Finlo; Johnsen, Geir; Kintisch, Eli. (2018) “Thaw”, episode 3 of 3, Why Atlantic fish are inviding the Arctic . Vox Vox [Internet] 2018-04-23
  • Academic lecture
    Johnsen, Geir. (2018) Underwater hyperspectral imaging for marine biological applications. University of Hawaii at Manoa Seminar at University of Hawaii at Manoa , Honolulu 2018-09-21 - 2018-09-21
  • Academic lecture
    Johnsen, Geir; Berge, Jørgen; Sørensen, Asgeir Johan. (2018) Enabling technology fort marine ecology. UiT and Laval University in Quebec, Canada Conference , Tromsø 2018-01-18 - 2018-01-20
  • Popular scientific lecture
    Johnsen, Geir. (2018) Light as a cue of life - Arctic. NTNU Ocean Club Arktis , ISAK, Trondheim 2018-02-22 - 2018-02-22
  • Lecture
    Johnsen, Geir. (2018) Polar night - light as a cue of life. HIMB, University of Hawaii at Manoa Seminar at Hawaiian Inst of marine biology (HIMB), University of Hawaii at Manoa , Honolulu 2018-10-31 - 2018-10-31
  • Interview
    Ludvigsen, Martin; Berge, Jørgen; Sørensen, Asgeir Johan; Johnsen, Geir. (2018) Havets hemmeligheter hentes opp fra dypet. Gemini.no Gemini.no [Journal] 2018-01-10
  • Interview
    Ludvigsen, Martin; Berge, Jørgen; Sørensen, Asgeir Johan; Johnsen, Geir; Schiopca, Francesca. (2018) Light pollution from research ship makes Artic zooplankton return to the deep. ZME Science ZME Science [Internet] 2018-01-29

2017

  • Lecture
    Geoffroy, Maxime; Berge, Jørgen; Majaneva, Sanna Kristiina; Johnsen, Geir; Cottier, Finlo Robert. (2017) First records of Periphylla periphylla in a high Arctic fjord: a newcomer or a returning visitor?. Gordon Research Seminar in Polar Marine Science , Ventura 2017-03-25 - 2017-03-31
  • Interview
    Johnsen, Geir. (2017) Runde – reduksjon av sjøfuglbestand. NRK Dagsrevyen NRK Dagsrevyen [TV] 2017-08-31
  • Interview
    Johnsen, Geir. (2017) Om roboter og sjøfugl på Runde. NRK Radio NRK Radio [Radio] 2017-07-03
  • Academic lecture
    Johnsen, Geir. (2017) Polar night – past, present and future – A view for nature management and decision making. Academy of Art NTNU The Henningsvær charter, Henningsvær 28-30th Sep 2017. , Henningsvær 2017-09-28 - 2017-09-30
  • Academic lecture
    Berge, Jørgen; Johnsen, Geir. (2017) Life and light in the dead of night. Lomonosov Moscow State University. Science Week in Moscow , Moskva 2017-10-05 - 2017-10-08
  • Academic lecture
    Johnsen, Geir; Berge, Jørgen; Sørensen, Asgeir Johan; Ludvigsen, Martin. (2017) Use of autonomous platforms in the Arctic. Norges Vitenskapsakademi for polarforskning og NTVA Seminar at Norges Vitenskapsakademi for polarforskning og Norges tekniske vitenskapsakademi. , Trondheim 2017-11-30 - 2017-11-30
  • Academic lecture
    Johnsen, Geir; Fragoso, Glaucia Moreira; Davies, Emlyn John; Sørensen, Asgeir Johan; Ludvigsen, Martin; Berge, Jørgen. (2017) Use of optical sensors to identify, map and monitor phyto- and zooplankton. Arctic Change Conference, University of Laval Quebec Arctic change conference, Quebec City, Canada , Quebec City 2017-12-11 - 2017-12-15
  • Poster
    Fragoso, Glaucia Moreira; Davies, Emlyn John; Ellingsen, Ingrid H.; Ludvigsen, Martin; Johnsen, Geir. (2017) Assessing phytoplankton and zooplankton dynamics using optical sensors. Technical University of Sydney Aquafluor II Conference in Sydney , Sydney 2017-12-05 - 2017-12-08
  • Academic lecture
    Berge, Jørgen; Johnsen, Geir; Torre, Pedro De La. (2017) Field activities in Kongsfjorden and relations between ice cinditions, light climate and ecosystem dynamics. NORUT Tromsø Resice project-Arctic 2030 - seminar , Tromsø 2017-09-13 - 2017-09-13
  • Academic lecture
    Johnsen, Geir; Berge, Jørgen; Zolich, Artur Piotr. (2017) . Light observatory in Ny Ålesund. NTNU Arctic ABC Seminar at NTNU , Trondheim 2017-10-09 - 2017-10-12
  • Interview
    Johnsen, Geir. (2017) Dykker så et merkelig fenomen utenfor Egersund. VG - TV VG - TV [TV] 2017-07-25
  • Interview
    Bazilchuk, Nancy Reney; Johnsen, Geir. (2017) Dark lords, werewolves and Indiana Jones in the Polar Night. Gemini - Starmus issue Gemini - Starmus issue [Journal] 2017-07-26
  • Academic lecture
    Johnsen, Geir; Ludvigsen, Martin; Sørensen, Asgeir Johan. (2017) Enabling technology for marine ecology studies. University of Porto and NTNU Official meeting between University of Porto and NTNU , Porto 2017-04-04 - 2017-04-05
  • Poster
    Zolich, Artur Piotr; Johnsen, Geir; Berge, Jørgen; Hagan, Bernard. (2017) Ny Ålesund light observatory experiment – from polar night to midnight sun. Arctic Change Conference Arctic Change Conference, Quebec City, Canada , Quebec City 2017-12-12 - 2017-12-16
  • Poster
    Kauko, Hanna M.; Mundy, C J; Granskog, M A; Peeken, Ilka; Johnsen, Geir; Ehn, Jens K.. (2017) Ice algal pigments in thin Arctic sea ice: Trends and correlation to transmitted irradiance. Gordon research conference on Polar marine sciences Gordon research conference on Polar marine sciences, Ventura, USA , Ventura 2017-03-26 - 2017-03-30
  • Poster
    Kauko, Hanna M.; Taskjelle, Torbjørn; Assmy, Philipp; Pavlov, Alexey; Mundy, C J; Duarte, Pedro. (2017) Windows in Arctic sea ice – light transmission and ice algal response in a refrozen lead. Norsk Polarinstitutt ESSAS international open science meeting, Tromsø, Norway, , Tromsø 2017-06-12 - 2017-06-15
  • Academic lecture
    Johnsen, Geir. (2017) Kunnskapsgenerering, kartlegging og overvåkning I nordområdene med autonome systemer. NTVA Norges Teknisk Vitenskapsakademi (NTVA) årsmøte , Trondheim, NTNU 2017-02-14 - 2017-02-14
  • Interview
    Sørensen, Asgeir Johan; Johnsen, Geir; Ludvigsen, Martin. (2017) Sjøfugl, fisk og teknologi på Runde Miljøsenter. Vestlandsnytt Vestlandsnytt [Newspaper] 2017-02-24
  • Interview
    Johnsen, Geir. (2017) Kvifor minkar det med sjøfugl?. Vestlandsnytt Vestlandsnytt [Newspaper] 2017-06-23
  • Interview
    Johnsen, Geir. (2017) Redusert sjøfuglbestand på Runde. NRK Radio - God morgon, Møre & Romsdal NRK Radio - God morgon, Møre & Romsdal [Radio] 2017-06-22
  • Academic lecture
    Johnsen, Geir. (2017) Bruk av ny teknologi for marine økosystemobservasjoner i luft og vann. Runde Miljøsenter og SFF AMOS Workshop - planlegging av Runde kartlegging, overvåkning og tokt i juni 2017 , Runde 2017-02-28 - 2017-03-01
  • Academic lecture
    Johnsen, Geir. (2017) Use of enabling technology for marine science applications. Senter for Autonome Marine Operasjoner og Systemer (AMOS) SFF AMOS og FFI Seminar , Trondheim 2017-06-08 - 2019-06-08
  • Academic lecture
    Johnsen, Geir. (2017) Hyperspectral imaging above and in water – applications. Centre Autonomous Marine Operations and Systems (AMOS) NTNU Small Satellite Seminar , Trondheim 2017-06-06 - 2017-06-06
  • Academic lecture
    Johnsen, Geir. (2017) Can novel technologies revolutionise the montoring regime in sea-based aquaculture?. Ocean Week and NTNU Ocean Week Conference, Trondheim , Trondheim 2017-05-02 - 2017-05-05
  • Interview
    Johnsen, Geir. (2017) Unikt forskningsprosjekt ved Runde. NRK Nyheter NRK Nyheter [TV] 2017-06-22
  • Lecture
    Geoffroy, Maxime; Berge, Jørgen; Falk-Petersen, Stig; Johnsen, Geir; Santana Hernandez, Nestor; Cusa, Marine Lure Joana. (2017) Northward range expansion of boreal species into the Arctic: further evidences from the polar night. ArcticChange conference , Quebec City 2017-12-11 - 2017-12-15
  • Poster
    Geoffroy, Maxime; Berge, Jørgen; Majaneva, Sanna Kristiina; Johnsen, Geir; Cottier, Finlo Robert. (2017) First records of Periphylla periphylla in a high Arctic fjord: a newcomer or a returning visitor?. Gordon Reserach Conference in Polar Marine Science , Venture 2017-03-25 - 2017-03-31
  • Interview
    Ludvigsen, Martin; Johnsen, Geir; Meland, Svein Inge. (2017) Laboratorium på bunnen av Trondheimsfjorden. Adresseavisen Adresseavisen [Newspaper] 2017-06-28
  • Interview
    Johnsen, Geir; Sævik, Bjørnar Torvholm. (2017) - Dette er helt fantastisk - Supersjeldent blekksprutfenomen i Ålesund. Sunnmørsposten Sunnmørsposten [Newspaper] 2017-07-29
  • Academic lecture
    Ludvigsen, Martin; Sørensen, Asgeir Johan; Johnsen, Geir. (2017) Autonomous technology in marine environment mapping and monitoring. Runde Environmental Centre Autonomous Vehicles for ocean monitoring , Runde 2017-12-05 - 2017-12-06
  • Interview
    Johnsen, Geir; Ludvigsen, Martin; Thorbjørnsen, Susanna Huneide; Berge, Jørgen; Rapp, Ole Magnus. (2017) Nytt superverktøy finner liv i ishavet. Nordlys Nordlys [Newspaper] 2017-01-31

2016

  • Interview
    Hyman, Randall; Berge, Jørgen; Cohen, Jonathan; Moline, Mark A.; Johnsen, Geir. (2016) In the polar ‘twilight zone,’ these unusual sea creatures outshine the starlight. Science Magazine Science Magazine [Journal] 2016-11-04
  • Interview
    Hyman, Randall; Berge, Jørgen; Johnsen, Geir; Malzahn, Nicole; Cohen, Jonathan. (2016) Floating in the Arctic Darkness. The Atlantic The Atlantic [Journal] 2016-03-22
  • Interview
    Johnsen, Geir; Sørensen, Asgeir Johan; Berge, Jørgen. (2016) Nye mysterier avdekkes i Polhavet. Aftenposten Aftenposten [Newspaper] 2016-01-11
  • Lecture
    Søreide, Janne E.; Gradinger, Rolf; Niehoff, Barbara; Bluhm, Bodil; Gabrielsen, Tove M.; Peeken, Ilka. (2016) Arctic Ocean winter ecology – the Big Black Box. 3rd Arctic Observing Summit 2016-03-12 - 2016-03-18
  • Interview
    Ødegård, Øyvind; Berge, Jørgen; Johnsen, Geir; Støbakk, Torun. (2016) Skrekklarven var båtfolkets mareritt. Dagbladet Dagbladet [Newspaper] 2016-03-01
  • Programme participation
    Johnsen, Geir. (2016) Nye arter funnet på Svalbard. NRK P1 NRK P1 [Radio] 2016-02-23
  • Programme participation
    Johnsen, Geir. (2016) Liv i Polarnatta. NRK P1 NRK P1 [Radio] 2016-02-29
  • Interview
    Ødegård, Øyvind; Johnsen, Geir. (2016) Utforsker havets dyp. UiT The Arctic University of Norway UiT The Arctic University of Norway [Internet] 2016-02-03
  • Interview
    Nornes, Stein Melvær; Johnsen, Geir. (2016) Easier automated visual mapping of biodiversity. Geoconnection.com Geoconnection.com [Business/trade/industry journal] 2016-11-30
  • Documentary
    Johnsen, Geir. (2016) Kings Bay 100 år. NRK NRK [TV] 2016-12-20
  • Programme participation
    Sørbø, Kari; Johnsen, Geir. (2016) NRK P1+ Frokostradio - "Liv i Polarnatta". NRK P1+ Frokostradio NRK P1+ Frokostradio [Radio] 2016-02-29
  • Interview
    Flå, Ellen; Johnsen, Geir. (2016) God morgen Trøndelag - Polarnatt. NRK P1 NRK P1 [Radio] 2016-02-23
  • Interview
    Eirik, Palm; Berge, Jørgen; Johnsen, Geir. (2016) Fant dypvannsfisk på grunna. Svalbardposten Svalbardposten [Newspaper] 2016-01-29
  • Interview
    Opar, Alisa; Berge, Jørgen; Johnsen, Geir. (2016) Meet the Night Creatures of the Warming Arctic. Audobon Magazine Audobon Magazine [Journal] 2016-01-01
  • Interview
    Aarskog, Karine Nigar; Ødegård, Øyvind; Johnsen, Geir; Berge, Jørgen. (2016) Undervannsrobot som oppfyller tre ønsker. forskning.no forskning.no [Internet] 2016-02-16
  • Interview
    Ødegård, Øyvind; Johnsen, Geir; Berge, Jørgen. (2016) Dark lords, werewolves and Indiana Jones in the polar night. Science Nordic Science Nordic [Internet] 2016-03-19
  • Interview
    Berge, Jørgen; Kintish, Eli; Ødegård, Øyvind; Johnsen, Geir. (2016) Arctic shipworm discovery alarms archaeologists. Science Science [Journal] 2016-02-26

2015

  • Academic lecture
    Ludvigsen, Martin; Thorsnes, Terje; Hansen, Roy Edgar; Sørensen, Asgeir Johan; Johnsen, Geir; Lågstad, Petter Arthur. (2015) Underwater vehicles for environmental management in coastal areas. IEEE/MTS OCEANS 2015 , Genova 2015-05-18 - 2015-05-21
  • Interview
    Lingenhöhl, Daniel; Berge, Jørgen; Johnsen, Geir. (2015) Highlife in der Polarnacht. Spektrum Spektrum [Journal] 2015-09-25
  • Interview
    Webb, Jonathan; Berge, Jørgen; Johnsen, Geir. (2015) Arctic ocean's wakeful winter revealed. BBC News BBC News [TV] 2015-09-24
  • Poster
    Vogedes, Daniel Ludwig; Berge, Jørgen; Daase, Malin; Johnsen, Geir; Darnis, Gérald; Last, Kim S.. (2015) Expect the unexpected - a new perspective and understanding of marine life at high latitudes. Gordon Gordon Research Conference and Seminar on Polar Marine Science , Lucca 2015-03-14 - 2015-03-20

2014

  • Lecture
    Johnsen, Geir; Sørensen, Asgeir Johan; Berge, Jørgen. (2014) Varulver i polarnatta. NTVA NTVA-/NVP-seminar i Trondheim , Trondheim 2014-11-25 - 2014-11-25
  • Academic lecture
    Ødegård, Øyvind; Johnsen, Geir; Sørensen, Asgeir Johan. (2014) Use of Underwater Hyperspectral Imager (UHI) in Marine Archaeology. Ocean Optics Conferences Ocean Optics XXII , Portland, Maine 2014-10-26 - 2014-10-31
  • Popular scientific lecture
    Johnsen, Geir; Berge, Jørgen. (2014) Varulvene kommer!. UNIS og NPI Svalbard seminaret , Longyearbyen 2014-02-01 -
  • Academic lecture
    Johnsen, Geir. (2014) KOMPiS (Kompetanse i Skolen) Biodiversitet - Trondheimsfjorden . PLU NTNU Kompetanse i skolen (KOMPiS) , Trondheim 2014-09-02 - 2014-09-02
  • Academic lecture
    Johnsen, Geir. (2014) Underwater hyperspectral imagery for seafloor mapping - now and future perspectives. Curtin University and Aust Meterological & Oceanogr Society Seminar at Curtin University, Perth Western Australia , Perth 2014-03-26 - 2014-03-26
  • Academic lecture
    Johnsen, Geir; Sørensen, Asgeir Johan; Berge, Jørgen. (2014) Underwater robots & sensors in the Polar night. NTNU AUR-Lab Worshop in underwater robotics , Clarion Hotell & Congress, Trondheim 2014-03-03 - 2014-03-04
  • Documentary
    Ekra, Siv Ingrid Skau; Candeloro, Mauro; Dukan, Fredrik; Sørensen, Asgeir Johan; Ludvigsen, Martin; Johnsen, Geir. (2014) ROV-drift på havbunnen. Gemini.no Gemini.no [Business/trade/industry journal] 2014-02-19
  • Academic lecture
    Johnsen, Geir; Berge, Jørgen. (2014) "Varulvene kommer". Norw Academy of Polar Res (NAPR) & Techn Sci (NTVA) Seminar Norw Academy of Polar Res (NAPR) & Techn Sci (NTVA) , Lerchendal Gård Trondheim 25 Nov 2014 2014-11-25 - 2014-11-25
  • Lecture
    Johnsen, Geir. (2014) Perspektiv fra en faglig ansatt. Strategiske partnerskap og allianser – hva får vi ut av dem – case NORUS . Senter for høyere utdanning i Norge (SiU) Internasjonaliseringskonferansen 2014, Trondheim 5-6 mars 2014 , Trondheim - Studentersamfunnet 2014-03-05 - 2014-03-06
  • Interview
    Candeloro, Mauro; Dukan, Fredrik; Ludvigsen, Martin; Sørensen, Asgeir Johan; Johnsen, Geir; Ekra, Siv Ingrid Skau. (2014) Smarte roboter tar nye bilder av havbunnen. Universitetsavisa.no & Forskning.no Universitetsavisa.no & Forskning.no [Business/trade/industry journal] 2014-02-19
  • Interview
    Johnsen, Geir; Hansen, Ingrid; Hanssen, Christian. (2014) Dette kameraet kan bli det nye ekkoloddet – Ser flere farger enn det menneskelige øyet. Teknisk Ukeblad Teknisk Ukeblad [Business/trade/industry journal] 2014-03-26
  • Academic lecture
    Bones, Atle M.; Nymark, Marianne; Valle, Kristin Collier; Winge, Per; Brembu, Tore; Johnsen, Geir. (2014) System responses to equal doses of photosynthetically usable radiation of blue, green and red light in the diatom Phaeodactylum tricornutum. Society for Experimental Biology SEB 2014 , Manchester 2014-06-30 - 2014-07-04

2013

  • Academic lecture
    Ødegård, Øyvind; Sørensen, Asgeir Johan; Johnsen, Geir. (2013) Towards Autonomy in Marine Archaeology. Øhavsmuseet og Syddansk Universitet Nordisk Konference for Marinarkæologi , Rudkøbing 2013-10-24 - 2013-10-25
  • Academic lecture
    Johnsen, Geir; Hansen, Ingrid; Ekehaug, Stefan. (2013) Identification, mapping & monitoring of underwater habitats using Underwater Hyperspectral Imager (UHI) on robots. DNV-GL Workshop on sea bed habitats of environmental concern , Høvik 2013-10-17 - 2013-10-18
  • Interview
    Ødegård, Øyvind; Johnsen, Geir. (2013) "Denne vekker interesse hos NASA og US Navy" innslag på NRK Midtnytt om UHI og arkeologi. NRK NRK [TV] 2013-04-26
  • Academic lecture
    Ludvigsen, Martin; Låge, Petter A.; Johnsen, Geir; Sørensen, Asgeir Johan; Ødegård, Øyvind. (2013) Scientific operations combining ROV and AUV in the Trondheim Fjord. MTS/IEEE OCEANS’13 , Bergen 2013-06-10 - 2013-06-13
  • Programme participation
    Johnsen, Geir; Sørensen, Asgeir Johan. (2013) Koraller i dypet. Schrødingers Katt NRK Schrødingers Katt NRK [TV] 2013-03-07
  • Popular scientific lecture
    Johnsen, Geir. (2013) Undervannsroboter i Trondheimsfjorden. Forskningsdagene i Trondheim NTNU Forskningsdagene i Trondheim , FF Gunnerus i Trondheimsfjorden 2013-09-28 - 2013-09-28
  • Academic lecture
    Johnsen, Geir; Ludvigsen, Martin; Sørensen, Asgeir Johan; Moline, Mark A.. (2013) Underwater hyperspectral imagery for identification, mapping and monitoring of bio-geo-chemical features on the sea floor. Blue Photonics 3 2013-03-18 - 2013-03-20
  • Popular scientific lecture
    Johnsen, Geir. (2013) Trondheimsfjordens hemmeligheter - i dypet. Trondheim Rotary Klub Trondheim Rotary Klub , Trondheim 2013-03-06 - 2013-03-06
  • Documentary
    Johnsen, Geir. (2013) Trondheimsfjordens hemmeligheter. Nrk 2 Kunnkapskanalen Nrk 2 Kunnkapskanalen [TV] 2013-11-16
  • Academic lecture
    Johnsen, Geir; Myrnes Hansen, Ingrid; Ekehaug, Stefan. (2013) Identification, mapping and monitoring of underwater habitats using underwater hyperspectral imager on robots. DNV Workshop on Sea Bed Habitats of Environmental Concern 2013 , Høvik 2013-10-17 - 2013-10-18
  • Academic lecture
    Johnsen, Geir. (2013) Marine Arctic environment- a quick overview. UNIS, FFI, Kongsberg Maritime, NTNU MCD Workshop in underwater technology & operations, UNIS 10-12 April 2013 , Longyearbyen, Svalbard 2013-04-10 - 2013-04-12
  • Popular scientific lecture
    Johnsen, Geir. (2013) Trondheimsfjordens hemmeligheter. NTNU Kunnskapsbyen , Trondheim 2013-09-07 - 2013-09-07
  • Academic lecture
    Johnsen, Geir; Sørensen, Asgeir Johan. (2013) Underwater remote sensing – mapping & monitoring of marine life. Direktoratet for naturforvaltning Workshop on habitat mapping and time-series in coastal Norway and Svalbard , Universitetssentret på Svalbard (UNIS) 2013-02-05 - 2013-02-07
  • Academic lecture
    Johnsen, Geir; Sørensen, Asgeir Johan. (2013) Ny teknologi for utforskning av havrommet. Årssamling FHL Midtnorsk Havbrukslag Årssamling FHL Midtnorsk Havbrukslag , Trondheim 2013-02-14 - 2013-02-14
  • Interview
    NRK, P2; Johnsen, Geir; Berge, Jørgen. (2013) Liv I polarnatten – 14 min Podcast , del 2 av 2. NRK - Ekko (P2) NRK - Ekko (P2) [Radio] 2013-01-28
  • Academic lecture
    Johnsen, Geir; Moline, Mark A.; Ludvigsen, Martin; Berge, Jørgen; Sørensen, Asgeir Johan. (2013) Use of underwater robots and sensors to identify, map, monitor biomass & production in the Arctic. Arctic Frontiers Arctic Frontiers , Tromsø 2013-01-20 - 2013-01-25
  • Interview
    NRK, P2; Johnsen, Geir; Berge, Jørgen. (2013) Liv i polarnatten (del 1 av 2) i Ekko. NRK - Ekko (P2) NRK - Ekko (P2) [Radio] 2013-01-21

2012

  • Academic lecture
    Båtnes, Anna Solvang; Berge, Jørgen; Johnsen, Geir; Miljeteig, Cecilie. (2012) In situ light responses of high Arctic Calanus spp. Lewis Conference Services International Ocean Optics 2012 , Glasgow 2012-10-08 - 2012-10-12
  • Academic lecture
    Ødegård, Øyvind; Ludvigsen, Martin; Johnsen, Geir; Sørensen, Asgeir Johan; Ekehaug, Stefan; Dukan, Fredrik. (2012) Managing data from multiple sensors in an interdisciplinary research cruise. University of Southampton CAA 2012 (Computer Applications and Quantitative Methods in Archaeology ) , Southampton 2012-03-26 - 2012-03-29
  • Academic lecture
    Johnsen, Geir. (2012) In situ and remote sensing of phytoplankton pigments – some examples of detecting pigment-signatures using different platforms and optical sensors. SYKE – centre Marine Environmental Monitoring, Helsinki Final PROTOOL meeting at SYKE – “Marine Environmental Monitoring Methods , Helsinki 2012-08-28 - 2012-08-31
  • Popular scientific lecture
    Johnsen, Geir; Sørensen, Asgeir Johan. (2012) Marine undervannsroboter og sensorer til havovervåkning. Gløshaugen Akademiske Klubb, NTNU Luncheseminar Gløshaugen Akademiske Klubb, NTNU , Gløshaugen Akademiske Klubb, NTNU 2012-01-26 - 2012-01-26
  • Academic lecture
    Johnsen, Geir; Sørensen, Asgeir Johan. (2012) NTNU´s kobling naturvitenskap/teknologi gir nøkkelrolle for havrom-utforskning via NTNU MCD. NTNU Marine Coastal Development NTNU Marine coastal development strategiseminar , Hovde Gård, Sør Trøndelag 2012-01-11 - 2012-01-12
  • Academic lecture
    Johnsen, Geir; Moline, Mark A.; Berge, Jørgen; Sørensen, Asgeir Johan. (2012) Underwater mapping and monitoring in the Arctic. Workshop in Underwater Technology and operations. NTNU AUR-Lab, UNIS og FFI Workshop in Underwater Technology and operations , UNIS Longyearbyen 2012-03-19 - 2012-03-21
  • Academic lecture
    Johnsen, Geir; Moline, Mark A.; Berge, Jørgen; Schofield, Oscar. (2012) Technology and science development for marine monitoring and ocean observation. NTNU AUR-Lab, UNIS og FFI Workshop in Underwater Technology and operations , UNIS, Longyearbyen 2012-03-19 - 2012-03-21
  • Popular scientific lecture
    Johnsen, Geir. (2012) Trondheimsfjordens hemmeligheter – I dypet. Kunnskapsbyen, NTNU Kunnskapsbyen, NTNU , Sumhuset, Vitenskapsmuseet, NTNU 2012-10-24 - 2012-10-24
  • Interview
    opland, egil M; Johnsen, Geir. (2012) Fjernstyrt ubåt kartlegger fjorden. Adresseavisen Adresseavisen [Newspaper] 2012-11-05
  • Academic lecture
    Johnsen, Geir; Sørensen, Asgeir Johan. (2012) UHI based mapping of habitats and organisms on the seabed. NGU International workshop on seabed mapping methods and technology , NGU Trondheim 2012-10-17 - 2012-10-18
  • Academic lecture
    Båtnes, Anna Solvang; Miljeteig, Cecilie; Berge, Jørgen; Johnsen, Geir. (2012) Light responses of Arctic zooplankton during the polar night. Ocean Optics, The Oceanographic Society Ocean Optics Conference XXI , Glasgow 2012-10-07 - 2012-10-12
  • Academic lecture
    Hovland, Erlend Kjeldsberg; Dierssen, Heidi; Johnsen, Geir. (2012) Emiliania huxleyi in the Barents Sea. Ocean Optics, the Oceanographic Society Ocean Optics Conference XXI , Glasgow 2012-10-07 - 2012-10-12
  • Popular scientific lecture
    Johnsen, Geir. (2012) Marine undervannsroboter og sensorer til havovervåkning. Inst for biologu, NTNU Luncheseminar Institutt for biologi , Realfagsbygget, NTNU 2012-02-03 - 2012-02-03
  • Academic lecture
    Johnsen, Geir. (2012) Marine biology and TBS- Marine underwater robots & sensors. NTNU Marine Science Seminar, Dept biology NTNU Marine Science Seminar , Trondhjem biologiske stasjon, NTNU 2012-02-23 -

2011

  • Academic lecture
    Johnsen, Geir. (2011) The use of a underwater hyperspectral imager to map and monitor bio-geo-chemical object of interest on seafloor. Australian Meterological & Oceanographic Society Australian Meterological & Oceanographic Society symposium , University of Western Australia, Perth, Western Australia. 2011-05-04 - 2011-05-04
  • Academic lecture
    Moline, Mark A.; Johnsen, Geir; Berge, Jørgen. (2011) Technology Development for marine monitoring and oceran observation – a SiU funded research based educational program between US and Norway. Royal Norwegian Embassy Transatlantic Science Week, UC Berkeley , University of California Berkeley, San Francisco 2011-10-25 - 2011-10-27
  • Academic lecture
    Johnsen, Geir; Ardelan, Murat Van. (2011) Underwater monitoring of bio-geo-chemical objects of interest using underwater hyperspectral imagery. Royal Norwegian Embassy Transatlantic Science Week , University of California Berkeley, San Francisco 2011-09-25 - 2011-09-26
  • Academic lecture
    Johnsen, Geir; Sørensen, Asgeir Johan. (2011) Applied Underwater Robotics Laboratory – A new view of subsea applications. The Society for Underwater Technology (AiUT) and The Austral The Society for Underwater Technology (AiUT) and The Australian Hydrographic Society. , Perth 2011-11-03 - 2011-11-03
  • Academic lecture
    Berge, Jørgen; Moline, Mark; Johnsen, Geir. (2011) NORUS – Research-based educational field studies using new sensors for mapping of water surface, column and sea-floor. Royal Norwegian Embassy Transatlantic Science Week, UC Berkeley , University of California Berkeley, San Francisco 2011-10-25 - 2011-11-27
  • Documentary
    Sørensen, Asgeir Johan; Ludvigsen, Martin; Ellingsen, Harald; Johnsen, Geir. (2011) NTNU best på bunnen (åpning av NTNU Applied Underwater Robotics Laboratory, 23 aug 2011 med Trond Giske). Adresseavisen Adresseavisen [Newspaper] 2011-08-24
  • Interview
    Johnsen, Geir. (2011) “Nordmøringer I Australia” - Lars Djupegot møter Geir Johnsen i Perth. Tidens Krav TV Tidens Krav TV [TV] 2011-03-25
  • Interview
    Johnsen, Geir. (2011) For gründerpris? NTNU´s spin-off selskap Ecotone i finalen. Tidens Ktrav Tidens Ktrav [Newspaper] 2011-05-02
  • Popular scientific lecture
    Johnsen, Geir. (2011) Planktonalger – fra fjernmåling til gener. Artsdatabanken NATUR 2011, Artsdatabankens konferanse om biologisk mangfold , Royal Garden Hotell, Trondheim 2011-11-15 - 2011-11-15
  • Popular scientific lecture
    Johnsen, Geir. (2011) Romteknologi under havoverflaten – Undervannsroboter med optiske sensorer for deteksjon av bio-geo-kjemiske objekter av interesse. Norske Havforskers Forening Havforskermøte 2011 , Royal Garden Hotell, Trondheim 2011-11-16 - 2011-11-17
  • Interview
    Johnsen, Geir. (2011) Som fisken I vannet – forskere fra Nordmøre. Tidens Krav Tidens Krav [Newspaper] 2011-01-01
  • Academic lecture
    Lynch, Mervin; Hedley, John; Klonowski, Wojchiech; Slivkoff, Matt; Johnsen, Geir; Fearns, Peter. (2011) Remote sensing of the eutrophic state of coastal waters via phytoplankton functional groups. ICRSE, ISPRS, SSS, CSIRO, International Symposium on Remote Sensing of Environment , Sydney 2011-04-10 - 2011-04-15
  • Academic lecture
    Johnsen, Geir. (2011) Underwater hyperspectral imaging of Great Barrier Reef corals. Australia Museum, Lizard Island Research Station Lizard Island Research seminar, Australian Museum , Lizard Islands, Queensland, Australia 2011-01-18 - 2011-01-18
  • Academic lecture
    Johnsen, Geir. (2011) The use of a underwater hyperspectral imagery to map bio-geo-chemical objects of interest on seafloor. Curtin University of Technology Imaging and Phycics seminar series. , Perth 2011-05-25 - 2011-05-25
  • Academic lecture
    Johnsen, Geir. (2011) The use of underwater robotics and underwater hyperspectral imagery to map and monitor marine bio-diversity. Dept. Marine Science, Auckland Univeresity, New Zealand. School of Biology Sciences seminars , Auckland 2011-05-31 - 2011-05-31

2010

  • Poster
    Hovland, Erlend Kjeldsberg; Hancke, Kasper; Volent, Zsolt; Johnsen, Geir; Sakshaug, Egil. (2010) cDOM in the Barents Sea. Ocean Optics, The Oceanographic Society Ocean Optics XX , Anchorage 2010-09-27 - 2010-10-01
  • Academic lecture
    Hovland, Erlend Kjeldsberg; Hancke, Kasper; Høkedal, Jo; Johnsen, Geir; Moline, Mark; Sakshaug, Egil. (2010) An in situ bio-optical study of Emiliania huxleyi in the Barents Sea. the International Polar Year (IPY) Oslo Science Conference (OSC) , Oslo 2010-06-08 - 2010-06-12
  • Academic lecture
    Dierssen, Heidi; Johnsen, Geir; Cummings, Molly; Maginnis, Tara; Holt, J.. (2010) Spectral polarized reflectance from skin preparations from four different subtropical fish species. Ocean Optics Ocean Optics conference OOXX , Anchorage, Alaska 2010-09-27 - 2010-10-01
  • Documentary
    Johnsen, Geir; Berge, Jørgen; Moline, Mark; Jenssen, Eva Therese. (2010) Morgendagens miljøovervåkere. http://www.forskning.no/artikler/2010/mars/245803 http://www.forskning.no/artikler/2010/mars/245803 [Internet] 2010-03-31
  • Documentary
    Johnsen, Geir; Rapp, Ole Magnus. (2010) Undervannsroboter studerer livet i ishavet. Aftenposten Aftenposten [Newspaper] 2010-02-15
  • Academic lecture
    Hancke, Kasper; Hovland, Erlend Kjeldsberg; Johnsen, Geir; Moline, Mark; Sakshaug, Egil. (2010) The Underwater Light Regime and cDOM across the Polar Front (Barents Sea):With relevance for the Primary Production. International Polar Year (IPY) Oslo Science Conference (OSC) , Oslo 2010-06-08 - 2010-06-12
  • Documentary
    Berge, Jørgen; Johnsen, Geir; Moline, Mark. (2010) Into the deep, dark polar night waters. Description of NORUS expedition in Polar night, Kongsfjorden Jan 2010.Nettartikkel, Svalbard Science Forum. http://www.ssf.npolar.no/pages/news355.htm http://www.ssf.npolar.no/pages/news355.htm [Internet] 2010-03-26
  • Documentary
    Schofield, Oscar; Moline, Mark; Johnsen, Geir. (2010) "Robots: AUV Missions" Interview with Oscar Schofield and Mark Moline NORUS- program. www.robotspodcast.com. www.robotspodcast.com. [Internet] 2010-02-12
  • Documentary
    Johnsen, Geir; Berge, Jørgen; Moline, Mark. (2010) Morgendagens overvåkere. Schrødingers Katt. Schrødingers KattNRK 1 Schrødingers KattNRK 1 [TV] 2010-03-25
  • Documentary
    Johnsen, Geir; Berge, Jørgen; Moline, Mark. (2010) NORUS – Technology development for marine monitoring and ocean observation. http://siu.no/no/Programoversikt/Utdanningssamarbeid-med-Nor http://siu.no/no/Programoversikt/Utdanningssamarbeid-med-Nor [Internet] 2010-01-01
  • Documentary
    Johnsen, Geir; Berge, Jørgen; Moline, Mark; Jenssen, Eva Therese. (2010) The climate watchdogs of tomorrow. http://www.unis.no/60_NEWS/6060_Archive_2010/n_10_03_25_new_ http://www.unis.no/60_NEWS/6060_Archive_2010/n_10_03_25_new_ [Internet] 2010-03-25

2009

  • Academic lecture
    Nymark, Marianne; Valle, Kristin Collier; Brembu, Tore; Winge, Per; Johnsen, Geir; Bones, Atle M.. (2009) Molecular mechanisms behind acclimation to high light conditions for the marine diatom Phaeodactylum tricornutum. CMB seminar series 2009-03-03 - 2009-03-03
  • Academic lecture
    Nymark, Marianne; Valle, Kristin Collier; Brembu, Tore; Hancke, Kasper; Winge, Per; Andresen, Kjersti. (2009) En integrert analyse av molekylær akklimatisering til sterkt lys i kiselalgen Phaeodactylum tricornutum. Norsk institutt for vannforskning Algesymposium 2009 , CIENS, Forskningsparken, Oslo 2009-11-25 - 2009-11-26
  • Poster
    Nymark, Marianne; Valle, Kristin Collier; Brembu, Tore; Hancke, Kasper; Winge, Per; Andresen, Kjersti. (2009) Molecular mechanisms behind acclimation to high light conditions for the marine diatom Phaeodactylum tricornutum. American Society for Plant Biologists Plant Biology 2009 , Honolulu, Hawaii 2009-07-18 - 2009-07-22
  • Poster
    Nymark, Marianne; Valle, Kristin Collier; Hancke, Kasper; Andresen, Kjersti; Brembu, Tore; Johnsen, Geir. (2009) Global physiological and expression adaptation to changes in light condition in the diatom Phaeodactylum tricornutum. Norsk Biokjemisk Selskap 45th Contact Meeting of the Norwegian Biochemical Society , Røros 2009-01-29 - 2009-02-01
  • Poster
    Bones, Atle M.; Valle, Kristin Collier; Hancke, Kasper; Andresen, Kjersti; Brembu, Tore; Johnsen, Geir. (2009) Mining for genes, proteins, metabolites, nanoscale structures and molecular machinery of marine algae. UITø/NTNU/SINTEF Bioprosp2009 , Tromsø 2009-02-24 - 2009-02-25

2008

  • Poster
    Evertsen, Jussi; Johnsen, Geir. (2008) A window into endosymbiotic adaptation - from organelle to cell in photosynthetic phycozoans. Norske havforskeres forenings årsmøte , Tromsø 2008-11-05 - 2008-11-07
  • Documentary
    Johnsen, Geir; Berge, Jørgen; Gabrielsen, Tove M.. (2008) Overraskende funn i Arktis - Pikoplankton. http://www.nrk.no/programmer/tv/schrodingers_katt/1.6252692 http://www.nrk.no/programmer/tv/schrodingers_katt/1.6252692 [Internet] 2008-10-02
  • Documentary
    Johnsen, Geir; Berge, Jørgen; Gabrielsen, Tove M.. (2008) Klimaendringer, er de menneskeskapt?. http://www1.nrk.no/nett-tv/klipp/414199 http://www1.nrk.no/nett-tv/klipp/414199 [Internet] 2008-09-25
  • Documentary
    Johnsen, Geir; Berge, Jørgen; Gabrielsen, Tove. (2008) På tokt i polhavet. http://www1.nrk.no/nett-tv/indeks/146194 http://www1.nrk.no/nett-tv/indeks/146194 [Internet] 2008-10-02
  • Documentary
    Johnsen, Geir. (2008) Svamper mot blodkreft. http://www.nrk.no/nyheter/distrikt/nrk_trondelag/1.6272545 http://www.nrk.no/nyheter/distrikt/nrk_trondelag/1.6272545 [Internet] 2008-10-20
  • Programme participation
    Johnsen, Geir; Zotchev, Sergey. (2008) Svamper mot blodkreft. NRK Frokost TV NRK Frokost TV [TV] 2008-10-21
  • Programme participation
    Johnsen, Geir; Zotchev, Sergey. (2008) Svamper mot blodkreft -NTNUs rolle. NRK Trøndelag TV NRK Trøndelag TV [TV] 2008-10-20
  • Programme participation
    Johnsen, Geir; Berge, Jørgen; Gabrielsen, Tove M.. (2008) På tokt i polhavet med UNIS. Schrødingers katt. http://www1.nrk.no/nett-tv/klipp/419912 Schrødingers katt. http://www1.nrk.no/nett-tv/klipp/419912 [TV] 2008-10-02
  • Programme participation
    Johnsen, Geir; Berge, Jørgen; Gabrielsen, Tove M.. (2008) Klimaendringer, er de menneskeskapt?. Schrødingers katt. http://www1.nrk.no/nett-tv/klipp/414199 Schrødingers katt. http://www1.nrk.no/nett-tv/klipp/414199 [TV] 2008-09-25
  • Programme participation
    Johnsen, Geir; Berge, Jørgen; Gabrielsen, Tove M.. (2008) Pikoplankton i Polhavet. Schrødingers katt. http://www1.nrk.no/nett-tv/klipp/42182 Schrødingers katt. http://www1.nrk.no/nett-tv/klipp/42182 [TV] 2008-10-09
  • Interview
    Johnsen, Geir. (2008) På vannets betingelser (Universitetsavisa). http://www.universitetsavisa.no/ua_lesmer.php?kategori=nyhet http://www.universitetsavisa.no/ua_lesmer.php?kategori=nyhet [Internet] 2008-09-15
  • Interview
    Johnsen, Geir; Berge, Jørgen; Thoen, Hanne. (2008) Polhavets piraya. http://www.nrk.no/programmer/tv/schrodingers_katt/1.6277121 http://www.nrk.no/programmer/tv/schrodingers_katt/1.6277121 [Internet] 2008-10-23
  • Poster
    Hovland, Erlend Kjeldsberg; Johnsen, Geir; Moline, Mark. (2008) Combining AUV and hyperspectral imaging in coastal monitoring. Ocean Optics Society Ocean Optics conference , Barga, Italia 2008-10-06 - 2008-10-10
  • Poster
    Evertsen, Jussi; Johnsen, Geir. (2008) A window into endosymbiotic adaptation - from organelle to cell in photosynthetic phycozoans. Norske havforskeres forenings årsmøte , Tromsø 2008-11-05 - 2008-11-07

2007

  • Poster
    Johnsen, Geir; Volent, Zsolt; Sigernes, Fred; Berge, Jørgen; Hovland, Erlend Kjeldsberg; Sakshaug, Egil. (2007) Local hyperspectral imaging of ocean colour from tethered balloons in the Arctic. Arctic Frontiers , Tromsø 2007-01-16 - 2007-01-21
  • Documentary
    Jarvis, L. M.; Johnsen, Geir; Zotchev, Sergey. (2007) Liquid gold mine - Scientist in Norway are plumbing the seas for the next blockbuster medicine. Chemical and engineering news. Vol 85:22-28. http://pubs.acs.org/subscribe/journals/cen/85/i41/toc/toc_i4 http://pubs.acs.org/subscribe/journals/cen/85/i41/toc/toc_i4 [Internet] 2007-10-01
  • Academic lecture
    Johnsen, Geir. (2007) Makroalgeforskning ved TBS-IBI. Integrate SIP konferanse , Trondheim 2007-11-26 -
  • Academic lecture
    Johnsen, Geir. (2007) Marine bio-optics. NTNU , Trondheim 2007-02-20 -
  • Academic lecture
    Johnsen, Geir. (2007) Bruk av nye plattformer til tverrfaglig marin forskning ved NTNU. NFR Havet og Kysten , Trondheim 2007-04-12 -
  • Academic lecture
    Johnsen, Geir; Sakshaug, Egil. (2007) Application of in vivo fluorescence excitation spectra from different pigment-groups of phytoplankton. AquaFluo , Nove Hrady 2007-05-31 -
  • Academic lecture
    Johnsen, Geir. (2007) Bio-optikk til bruk i fjernmåling og in situ detektering av forskjellige biologiske komponenter i Trondheimsfjorden. NTNU-SINTEF Marin kystutvikling , Brekstad 2007-04-17 -
  • Academic lecture
    Johnsen, Geir. (2007) Hyperspectral monitoring of ocean colour. Norwegian Academy of Science and Letters, Statoil VISTA , Oslo 2007-02-06 -
  • Academic lecture
    Johnsen, Geir; Volent, Zsolt; Sigernes, F.. (2007) Fine scale studies using hyper-spectral remote sensing. ESSAS meeting in marine Arctic climate , Hakodate, Hokkaido 2007-06-04 -
  • Academic lecture
    Johnsen, Geir. (2007) Overvåkning, kartlegging av marine ressurser ved hjelp av optikk, akustikk og telemetri. Statoil Hydro , Rotvoll forskningssenter, Trondheim 2007-11-27 -
  • Poster
    Brembu, Tore; Valle, Kristin Collier; Størseth, T.R.; Østensen, Mari-Ann; Bjørk, Camilla; Andresen, Kjersti. (2007) The DIABOL project – mining for nanoscale structures and machinery of the diatom silica shell. Nanomat konferanse 2007-03-08 - 2007-03-08
  • Poster
    Hancke, Kasper; Hancke, Torunn Beate; Olsen, Lasse Mork; Johnsen, Geir. (2007) Temperature effects on photosynthesis-light responses measured by O2 evolution, pulse amplified modulated (PAM) fluorescence and 14C assimilation. AquaFluo Conference , Nove Hrady 2007-05-28 - 2007-06-01
  • Poster
    Johnsen, Geir; Volent, Zsolt; Sigernes, F.; Berge, Jørgen; Hovland, Erlend Kjeldsberg; Sakshaug, Egil. (2007) Local hyperspectral imaging of ocean colour from tethered balloons in the Arctic. Arctic Frontiers Conference , Tromsø 2007-01-16 - 2007-01-21
  • Poster
    Hancke, Torunn Beate; Hancke, Kasper; Johnsen, Geir; Sakshaug, Egil. (2007) Rate of O2 production from PAM fluorescence: Testing three bio-optical approaches against measured O2 production rate. AquaFluo Conference , Nove Hrady 2007-05-28 - 2007-06-01

2006

  • Academic lecture
    Hancke, Kasper; Hancke, Torunn Beate; Olsen, Lasse Mork; Johnsen, Geir; Glud, Ronnie N. (2006) Temperature effects on photosynthesis: Measurements using O2-microelectrodes, Pulse Amplitude Modulated (PAM) fluorescence and 14C-incorporation techniques. Norske havforskeres forening Annual meeting at the Association of Norwegian Oceanographers , Oslo 2006-11-01 - 2006-11-03
  • Academic lecture
    Johnsen, Geir. (2006) Nye tider for foto-opto-molekylo (FOM) biologi. IBI meeting, NTNU 2006-08-31 -
  • Academic lecture
    Johnsen, Geir. (2006) Monitoring of phytoplankton on coastal areas. UNESCO SCOR Meeting , Monte Carlo 2006-04-09 -
  • Academic lecture
    Johnsen, Geir. (2006) Marine Biology ?. IBI meeting, NTNU 2006-11-08 -
  • Programme participation
    Johnsen, Geir. (2006) Medisin fra havet. Schrødingers Katt Schrødingers Katt [TV] 2006-03-23
  • Poster
    Hancke, Torunn Beate; Hancke, Kasper; Johnsen, Geir; Sakshaug, Egil. (2006) The use of PAM fluorescence and bio-optical characteristics to estimate oxygen production in phytoplankton. Norke havforskeres forening Annual meeting at the Association of Norwegian Oceanographers , Oslo 2006-11-01 - 2006-11-03

2005

  • Programme participation
    Johnsen, Geir; Bordvik, Hans Otto. (2005) Forskning og foto under vann. (GJ underwater video and comments). Newton. [TV] 2005-09-18
  • Programme participation
    Johnsen, Geir. (2005) Er det mulig å se alger fra satelitt?. [Radio] 2005-02-10
  • Programme participation
    Johnsen, Geir; Zotchev, Sergey; Moore, Thomas. (2005) The medical gold rush. Sky News (England). 7 min program of NTNU´s bioprospecteering NFR project “Marine actinopmycetes”. Kew words with NTNU´s ROV to harvest songes to isolate new type of antiobiotica from sponges in the Trondheimsfjord. [TV] 2005-10-31
  • Academic lecture
    Johnsen, Geir. (2005) "Forskning og foto under vann” Fotoptip of GJ.www.nrk.no/programmer/TV/Newton´s hjemmside Publ. 1409 and updated 210905. NRK Newton spesial (NRK news website) 2005-09-18 -
  • Academic lecture
    Johnsen, Geir. (2005) Kunnskapsstatus om marine økosystem I Norge 2005. NFR headquarters Meeting in “Havet og kysten” , Oslo 2005-04-21 -
  • Academic lecture
    Johnsen, Geir. (2005) Evidence of global warming became so overwhelming in 2004, now the question is: What can we do about it. Vol 26, No 1 (see MEPS 303). Discover magazine (Jan issue by R. Kunzig). 2005-12-01 -
  • Academic lecture
    Johnsen, Geir. (2005) "Forskning og foto under vann” Fotoptip of GJ.www.nrk.no/programmer/TV/Newton´s hjemmside Publ. 1409 and updated 210905. NRK Newton spesial (NRK news website) 2005-09-21 -
  • Academic lecture
    Edvardsen, Bente; Eikrem, Wenche; Shalchian-Tabrizi, Kamran; Riisberg, Ingvild; Johnsen, Geir; Naustvoll, Lars. (2005) Phylogeny of a new ichthyotoxic dictyochophyte forming blooms in the North Sea. CNRS SBR Seminarserie ved CNRS Station Biologique de Roscoff , Station Biologique de Roscoff 2005-09-26 -
  • Poster
    Hancke, Kasper; Hancke, Torunn Beate; Olsen, Lasse Mork; Johnsen, Geir. (2005) Temperature effects on photosynthesis-light responses measured by O2-evolution, 14C-assimilation and Pulse Amplitude Modulated (PAM) fluorescence. Am. Soc. Limnol. Oceanogr. (ASLO) Am. Soc. Limnol. Oceanogr. (ASLO) conference , Santiago de Compostela 2005-06-19 - 2005-06-24
  • Popular scientific lecture
    Johnsen, Geir. (2005) Introduction & overview of Marine Ecosystems to NFR. “Kunnskapsstatus om marine økosystem I Norge 2005”. NFR headquarters Meeting in “Havet og kysten” , Oslo 2005-04-21 -

2004

  • Academic lecture
    Edvardsen, Bente; Eikrem, Wenche; Johnsen, Geir; Shalchian-Tabrizi, Kamran; Riisberg, Ingvild; Naustvoll, Lars. (2004) Phylogeny of a new ichthyotoxic dictyochophyte forming blooms in the Skagerrak. ISSHA 11th International Conference on Harmful Algae , Cape Town 2004-11-14 - 2004-11-19
  • Academic lecture
    Johnsen, Geir. (2004) Light utilzation in 13 different pigments groups of phytoplankton. American Society of Limnology and Oceanography Foredrag , Honolulu, Hawaii 2004-02-15 - 2004-02-20
  • Academic lecture
    Johnsen, Geir. (2004) Presentation of SISCAL and the use of remote sensing. SISCAL (EU), NTNU, Fylkesmannen i Sør-Trøndelag Foredrag , Trondheim 2004-09-28 - 2004-09-28
  • Academic lecture
    Johnsen, Geir; Hancke, Torunn Beate. (2004) SISCAL processor evaluation. SISCAL (EU prosjekt) Fordrag , NTNU 2004-07-05 - 2004-07-08
  • Academic lecture
    Forbord, Silje; Johnsen, Geir. (2004) Marine bio-prospecteering of marine macroalgae. MARBIN (NFR) Foredrag , Trondheim 2004-09-01 - 2004-09-02
  • Academic lecture
    Johnsen, Geir; Evertsen, Jussi. (2004) Photosynthetic Opisthobranchs. European Large Scale Fascility meeting (EU) Foredrag 2004-04-19 - 2004-04-20
  • Academic lecture
    Johnsen, Geir; Hancke, Torunn Beate. (2004) SISCAL dissemination evaluation. EU kommisjonen i Brussel Foredrag , Brussel 2004-12-13 - 2004-12-13
  • Academic lecture
    Johnsen, Geir; Evertsen, Jussi. (2004) Photosynthetic Nudibranchs and Sacoglossans. International Ocean Optics Society Foredrag/poster , Fremantle, W-Australia 2004-10-25 - 2004-10-29
  • Academic lecture
    Edvardsen, Bente; Eikrem, Wenche; Johnsen, Geir; Naustvoll, L.; Riisberg, I.; Shalchian-Tabrizi, K.. (2004) Verruca fascima gen. et. sp. nov. (Dictyochophyceae, Heterokontophyta) a bloom forming ichthyotoxic flagellate isolated from Skagerrak, Norway. UNESCO Foredrag , Cape Town 2004-11-01 - 2204-11-05
  • Academic lecture
    Olsen, Lasse Mork; Øzturk, Murat; Sakshaug, Egil; Vadstein, Olav; Sandaa, Ruth Anne; Johnsen, Geir. (2004) Interactions between metabolism, geochemistry and bacterial diversity in cultures of the marine dinoflagellate Prorocentrum minimum. American Society for Limnology and Oceanography ASLO møte , Honolulu, Hawaii 2004-02-15 - 2004-02-20
  • Academic lecture
    Bredholt, Harald; Fjærvik, E.; Hakvåg, Sigrid; Sletta, Håvard; Johnsen, Geir; Ellingsen, Trond Erling. (2004) Mining for antibiotic-producing bacteria in the Trondheim fjord. BIOPROS 2004 , Tromsø 2004-10-12 - 2004-10-14
  • Poster
    Bredholt, Harald; Fjærvik, Espen; Johnsen, Geir; Hancke, Torunn Beate. (2004) Isolation and characterization of actinomycete bacteria from sediments in the Trondheimsfjord, Norway. GMBIM/BMP , San Diego 2004-11-14 - 2004-11-18
  • Poster
    Bredholt, Harald; Fjærvik, E.; Johnsen, Geir; Johansen, G.; Sletta, Håvard; Ellingsen, Trond Erling. (2004) Isolation and characterization of actinomycete bacteria from sediments in the Trondheimsfjord, Norway. Genetics and Molecular Biology of Industrial Microorganisms conference , San Diego 2004-11-14 - 2004-11-18
  • Poster
    Salvesen, Ingrid; Brakstad, I.; Givskov, M.; Johnsen, Geir; Skindersø, M.; Størseth, Trond. (2004) Antibacterial activity in crude extracts of marine macroalgae. EAS Conference Poster , Barcelona 2004-10-20 - 2004-10-24
  • Poster
    Volent, Z.; Johnsen, Geir; Sigernes, F.. (2004) Comparison study between airborne remote sensing of of ocean colour using hyperspectral imager and in situ measurements of optical properties in surface waters in an Arctic fjord, Svalbard, May 2004. International Ocean Optics Society Poster , Fremantle, W-Australia 2004-10-25 - 2004-10-29
  • Poster
    Berge, J.; Johnsen, Geir; Nilsen, F.; Gulliksen, B.. (2004) Discovery of blue mussels (Mytilus edulis) in Svalbard - indication of temperature increase in the Arctic marine environment. Norske Havforskeres Forening Poster , Trondheim 2004-10-29 - 2004-11-02

2003

  • Poster
    Volent, Z.; Johnsen, Geir. (2003) Presentation of an optical sensor for in situ detection of phytoplankton, inorganic particles and yellow substance. Norske Havforskers Forenings årsmøte , Longyearbyen 2003-10-12 -
  • Poster
    Valle, Kristin Collier; Forbord, Silje; Hilstad, Kari; Evertsen, Jussi; Johnsen, Geir. (2003) Detectation of annual variation in red-, brown- and green macroalgae using in situ video technique and fluorescence microscopy. Norske havforskeres forening, årsmøtet , Longyearbyen 2003-10-12 -
  • Poster
    Forbord, Silje; Valle, Kristin Collier; Hilstad, Kari; Evertsen, Jussi; Johnsen, Geir. (2003) Annual variation of pigments in marine red-, brown- and green macroalgae. Norske havforskeres forening, årsmøtet , Longyearbyen 2003-10-12 -
  • Poster
    Johnsen, Geir. (2003) Bio-optical characterization in 10 major phytoplankton classes. Norske Havforskers Forenings årsmøte , Longyearbyen 2003-10-12 -
  • Academic lecture
    Johansen, Torunn Beate; Johnsen, Geir. (2003) SISCAL prototype evaluation. SISCAL Second Annual Meeting , Berlin, Germany 2003-09-20 -
  • Poster
    Hilstad, Kari; Evertsen, Jussi; Forbord, Silje; Valle, Kristin Collier; Johnsen, Geir. (2003) Annual variation in bio-optical characteristics in marine red-, brown-, and green macro algae. Norske havforskeres forening, årsmøtet , Longyearbyen 2003-10-12 -
  • Poster
    Evertsen, Jussi; Johnsen, Geir. (2003) Opisthobranchs with solar panels. Norske havforskeres forening, årsmøtet , Longyearbyen 2003-10-12 -

2002

  • Poster
    Salvesen, Ingrid; Størseth, Trond; Johnsen, Geir; Brakstad, O.G.. (2002) Bakteriehemmenede forbindelser i marine alger: Utvikling av miljøvennlige strategier for å kontrollere virulens og begroing. Ikke opplyst , Tromsø 2002-09-20 -
  • Poster
    Størseth, Trond; Reitan, Kjell Inge; Salvesen, Ingrid; Skjermo, Jorunn; Rainuzzo, J.; Johnsen, Geir. (2002) Immunostimulants and Antimicrobial Compounds from algae, Isolation and Characterization. Marin bioprospektering , Rica Ishavshotell, Tromsø 2002-02-05 -
  • Poster
    Fell, Frank; Herut, Barak; Johansen, Torunn Beate; Johnsen, Geir; Brozek, Morten; Hanssen, Frank. (2002) SISCAL: internet-based delivery of near-real-time data products on coastal areas and lakes from satellite imagery. SPIE , Hangzhou, China 2002-10-27 -
  • Poster
    Salvesen, Ingrid; Johnsen, Geir; Rainuzzo, J.; Reitan, Kjell Inge; Skjermo, Jorunn; Størseth, Trond. (2002) Immunstimulerende og antibakterielle forbindelser fra marine alger. Marin bioprospektering. Marin bioprospektering , Rica Ishavshotell, Tromsø 2002-02-05 -
  • Poster
    Evertsen, Jussi; Johansen, Torunn Beate; Johnsen, Geir. (2002) MODTEQ Module 2 - bio-optical methods. Model based development of advanced marine equipment. Norske Havforskeres Forenings årsmøte , Bergen 2002-11-02 -
  • Academic lecture
    Fell, Frank; Herut, Barak; Johansen, Torunn Beate; Johnsen, Geir; Brozek, Morten; Hanssen, Frank. (2002) SISCAL project: establishing an internet-based delivery of near-real-time data products on coastal areas and lakes from satellite imagery. SPIE 2002 , Hangzhou, China 2002-10-27 -
  • Academic lecture
    Børsheim, Knut Yngve; Kirkvold, Ståle; Johansen, Torunn Beate; Johnsen, Geir. (2002) Measurement of phytoplankton mortality as a tool to estimate turnover of phytoplankton biomass. Phytoplankton Productivity. An Appreciation of 50 years of the study of oceans and lakes , University of Bangor, N. Wales 2002-03-22 -
  • Academic lecture
    Johnsen, Geir. (2002) End user requirements in SISCAL (EU Romete sensing project). SISCAL meeting , Inst. of Geography, University of Copenhagen, Denmark 2002-01-05 -
  • Popular scientific lecture
    Johnsen, Geir. (2002) Queen Maud and myself. Norwegian Antarctic Research Expedition jan-mar 2001. Primary production under the sea ice , NTNU, Trondhjem biologiske stasjon 2002-05-02 -
  • Poster
    Johansen, Torunn Beate; Evertsen, Jussi; Johnsen, Geir. (2002) SISCAL - satellite-based information system on coastal areas and lakes. Norske havforskeres forening, årsmøtet , Bergen 2002-11-02 -

2001

  • Programme participation
    Johnsen, Geir; Johansen, Torunn Beate. (2001) Norsk Antarktis Forsknings Ekspedisjon "Fotosyntese i måneskinn". NRK TV1 NRK TV1 [TV] 2001-09-13
  • Academic lecture
    Ødegaard, Øyvind Tangen; Sortland, Bjørn; Ellingsen, Ingrid Helene; Slagstad, Dag; Johnsen, Geir; Sakshaug, Egil. (2001) An Interdisciplinary Marine Research Programme: How to promote generative interaction between marine scientists, modellers and engineers. OCEANS, 2001. MTS/IEEE Conference and Exhibition , Honolulu, Hawaii 2001-11-08 -

2000

  • Poster
    Legrand, C; Johnsen, Geir; Graneli, E; Sakshaug, Egil. (2000) Effect of polyamines on growth and toxicity of Chrysochromulina leadbeateri and Prymnesium patelliferum (Haptophytae). 9th International conference on Harful Algal Blooms. , 7-11 Februar
  • Poster
    Chauton, Matilde Skogen; Johnsen, Geir; Legrand, C; Graneli, E; Sakshaug, Egil. (2000) Development of a potential harmful algal bloom in mesocosm experiment monitored through pigment analysis and bio-optical measurements. 9th International conference on Harmful Algal Blooms. , 7-11 February
  • Poster
    Johnsen, Geir; Legrand, C; Graneli, C; Sakshaug, Egil. (2000) The use of a DIVING-PAM for detection of irradiance, biomass and photosystem II fluorescence yields in harmful algal bloom experiments: Discussion of methodological aspects. 9th International conference on Harmful Algal Blooms. , 7-11 Februar
  • Poster
    Tilstone, G; Johnsen, Geir; Chauton, Matilde Skogen; Johansen, T; Figueiras, F.G. (2000) Temporal evolution of photosynthetic parameters and primary prodution during a bloom of an ichthytoxic prymnesiophyte under different N/P ratios. 9th International conference on Harmful Algal Blooms. , 7-11 Februar
  • Poster
    Graneli, E; Legrand, C; Carlsson, P; Maestrini, S.Y; Hummert, C; Reichelt, M. (2000) Nitrogen and phosphorus deficiency favours the dominance and toxin content of harmful species in summer Baltic Sea phytoplankton. 9th International conference on Harmful Algal Blooms. , 7-11 Februar
  • Popular scientific lecture
    Mork, Jarle; Johnsen, Geir; Tokle, Nils Egil; Evensen, Jussi; Andresen, Kjersti. (2000) Trondhjem Biologiske Stasjon. Poster presentasjon. Trøndelagsmessa 2000 , Stjørdal, 29/8-3/9-2000.
  • Academic lecture
    Johnsen, Geir. (2000) Fish killing species. Conference in EC MAST III project ¨NUTOX¨ , 19-22 September.
  • Academic lecture
    Johnsen, Geir. (2000) Inhibition of toxin production in natural communities. Conference in EC MAST III ¨NUTOX¨ , 19-22 September.
  • Academic lecture
    Wägele, H; Johnsen, Geir. (2000) New result on histology and photosynthetic performance of solar-powered¨ opisthobranchs (Mollusca, Gastropoda, Opisthobranchia) constaining symbiotic chloroplasts or zooxanthellae. - , -
  • Academic lecture
    Johnsen, Geir. (2000) Bio-optical instruments for use in marine water and plankton. SINTEF seminarseries in bio-optics held at auditorium E5-101 Realfagsbygget NTNU, Gløshaugen. , 14.9.2000
  • Academic lecture
    Johnsen, Geir. (2000) Why bio-optics in marine biology. 2nd NTNU seminarseries in bio-optic held at the auditorium Trondhjem Biological Station. , 19.10.2000
  • Academic lecture
    Johnsen, Geir. (2000) Bio-optics as a tool to detect physiological status in toxic algae. Conference in EC MAST III prosject. , 19-22 September
  • Academic lecture
    Johnsen, Geir. (2000) Inhibition of toxin production in cultures. Conference in EC MART III prosject. , 19-22 September.
  • Academic lecture
    Johnsen, Geir. (2000) PSP producer Alexandrium tamarense II. Conferrnce in EC MAST III project. , 19-22 September.
  • Academic lecture
    Legrand, C; Johnsen, Geir; Graneli, E; Sakshaug, Egil. (2000) Effect of polyamines on growth and toxicity of Chrysochromulina leadbeateri, Haptophytae. Proceedings of the 9th International conference on Harmful Algal Blooms. , 7-11 Februar
  • Academic lecture
    Legrand, C; Johnsen, Geir; Graneli, E; Sakshaug, Egil. (2000) Effect of polyamines on growth and toxicity of Chrysochromulina leadbeateri and Prymnesium patellifreum (Haptophytes). HAB 2000 , 5-11 Februar
  • Academic lecture
    Chauton, Matilde Skogen; Johnsen, Geir; Legrand, C; Sakshaug, Egil; Granëli, E. (2000) Development of a pontential harmful algal bloom in a mesocosm experiment monitored through pigment analysis and bio-optical measurements. HAB 2000 , 5-11 Februar
  • Academic lecture
    Granëli, E; Legrand, C; Carlsson, P; Maestrini, SY; Johnsen, Geir; Hummert, C. (2000) Nitrogen and phosphorus deficiency favours the dominance and toxin content of harmful species in summer Baltic Sea phytoplankton. HAB 2000 , 5-11 Februar
  • Academic lecture
    Johnsen, Geir; Legrand, C; Chauton, Matilde Skogen; Eigeland, E; Sakshaug, Egil. (2000) The use of a DIVING-PAM for detection of irradiance, biomass and photosystem II fluorescene yield in harmful algal bloom experiments: Discussion of methodological aspects. HAB 2000 , 5-11 Februar

1999

  • Academic lecture
    Legrand, C; Johnsen, Geir; Hummert, C; Graneli, E. (1999) Variation in toxin production in two strains of Alexandrium tamarense: Effects of nitrogen and phosphorus replete vs. limited growth conditions. ASLO winter meeting. , Santa Fe, U.S.A.
  • Academic lecture
    Graneli, E; Carlsson, P; Legrand, C; Johnsen, Geir; Luckas, B; Maestrini, S. Y. (1999) Structuration of marine phytoplankton communities subjected to different levels of N, P and Si limitation in a mesocosm experiment. ASLO winter meeting. , Santa Fe, U.S.A.

1998

  • Academic lecture
    Johnsen, Geir; Sakshaug, Egil. (1998) Monitoring of Harmful Algal Blooms using bio-optical methods. International Symposium and workshop on harmful algal blooms in the Benguela current region and other upwelling ecosystems. Phagotrophy and toxicity in photosynthetic Prymnesium patellifreum (Haptophyte). , 5-6 November.
  • Academic lecture
    Chauton, Matilde Skogen; Johnsen, Geir; Sakshaug, Egil. (1998) In vivo fluorescence exitation spectra of phytoplankton. CANIGO 2nd general meeting. , Portugal.

1997

  • Academic lecture
    Johnsen, Geir; Sakshaug, Egil. (1997) Chlorophyll c3-containing prymnesiophytes and dinoglagellates: a potentially harmful phytoplankton group. VIII International Conference on Harmful Algae, , Spain

1996

  • Academic lecture
    Egeland, E. S; Johnsen, Geir; Liaaen-Jensen, S. (1996) Variable carotenoid composition in a prasinophycean phytoplankton acclimated to three different irradiances. 11th International Symposium on carotenoids, , Netherlands.

1994

  • Academic lecture
    Johnsen, Geir; Sakshaug, Egil. (1994) Pigment composition and photoadaptive pigment variation in three toxic marine dinoflagellate species. Ocean Science Meeting (ASGU/ASLO). , San Diego, California.

1993

  • Academic lecture
    Johnsen, Geir; Nelson, N. B; Jovine, R. V. M; Prezelin, B. B. (1993) Chromoprotein- and pigment dependent modeling of spectral light absorption in two dinoflagellates, Prorocentrum minimum and Heterocapsa pygmaea. Optical properties and quantum yields of aquatic photosynthetic systems. Binational Scientific Fundation Workshop. , [Mangler data]

1992

  • Academic lecture
    Johnsen, Geir; Samset, O; Volent, Z. (1992) Optical characteristics of phytoplankton in relation to remote sensing. In: Autonomous boi-optical ocean observing systems scientific symposium (AB. , California
  • Academic lecture
    Volent, Z; Johnsen, Geir. (1992) Presentation of an optical algae sensor "Optisens" designed for Eulerian measurements from a moored buoy. In: Autonomous bio-optical ocean observin systems scientific symposium (ABOOS). , California

1990

  • Academic lecture
    Gilstad, M; Johnsen, Geir; Sakshaug, Egil. (1990) Diurnal varations in cell chemistry, photosynthetic parameters and respiration in the marine diatom skeletonema costatum. In: NATO/ASI Individual cell & particle analysis in oceanography. Aquafredda di Maratea. , Italy.
  • Academic lecture
    Johnsen, Geir; Gilstad, M; Sakshaug, Egil. (1990) Diurnal variations in light absorption spectra, fluorescence excitation spectra and pigment composition in the marine diatom skeletonema costatum. NATO/ASI Individual cell & particle analysis in oceanography. Aquafredda di Maratea, , Italy.

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