Geir Johnsen

Norwegian University of Science and Technology — Norway

Earth and Planetary Sciences · Physical Sciences

51h-index7.9kcitations199works2.52yr avg
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Research Topics

Marine and coastal ecosystems(76), Marine and coastal plant biology(26), Marine Biology and Ecology Research(25), Isotope Analysis in Ecology(21), Algal biology and biofuel production(20)

Publications199 total

Assessing Arctic under sea-ice light regimes and ice algal bio-optical properties using ROV-based hyperspectral imaging
Polar Biology·2026Open Access
The influence of environmental factors and phytoplankton blooms on cyphonautes larvae abundance and bryozoan colony development at a kelp farm in central Norway
Marine Environmental Research·2026Open Access
Pictures from an all-sky camera with hourly resolution from the light observatory at Ny-Ålesund, Svalbard, Norway (complete year 2025)
UNINETT Sigma AS, Norway·2026Open Access
Open‐Source Marine Biodiversity Data Quality in the Norwegian Sea Spanning 149 Years: Knowledge Gaps in the Deep‐Sea Mining Opening Area
Ecology and Evolution·2025Open Access
Towards ecological integration into socio-technical risk assessment: A multidisciplinary system-theoretic approach
Ocean Engineering·2025· 1 citedOpen Access
Particulate and dissolved organic carbon losses in high latitude seaweed farms
The Science of The Total Environment·2025· 2 citedOpen Access
Using Underwater Hyperspectral Imaging to Increase Feature Detection and Improve Under-Ice Navigation
2025
Exploring Climate Change, Geopolitics, Marine Archeology, and Ecology in the Arctic Ocean Through Wood-Boring Bivalves
Oceanography·2025Open Access
Calibration verification of an underwater hyperspectral imaging push broom instrument to measure light in absolute units and field demonstration
Applied Optics·2024Open Access
Multi-vehicle adaptive 3D mapping for targeted ocean sampling
PLoS ONE·2024· 3 citedOpen Access
Pixelwise immersion factor calibration for underwater hyperspectral imaging instruments
Optics Express·2024· 2 citedOpen Access
Biomass estimations of cultivated kelp using underwater RGB images from a mini-ROV and computer vision approaches
Frontiers in Marine Science·2024· 7 citedOpen Access
Use of an uncrewed surface vehicle and near infrared hyperspectral imaging for sampling and analysis of aquatic microplastics
Marine Pollution Bulletin·2024· 11 citedOpen Access
The Role of Rapid Changes in Weather on Phytoplankton Spring Bloom Dynamics From Mid‐Norway Using Multiple Observational Platforms
Journal of Geophysical Research Oceans·2024· 9 citedOpen Access
Evaluating Hyperspectral Secchi Depth Retrieval Through Hybrid Modeling and Regression
2023· 1 cited
Photophysiologically active green, red, and brown macroalgae living in the Arctic Polar Night
Scientific Reports·2023· 13 citedOpen Access
Unmanned Vehicle and Hyperspectral Imager for a More Rapid Microplastics Sampling and Analysis
2023· 2 cited
Simulating Hyperspectral Datacubes for Ocean Color: A Foundation for Phytoplankton Recognition in Spectral Signatures
2023Open Access
Development and calibration of a high dynamic range and autonomous ocean-light instrument to measure sub-surface profiles in ice-covered waters
Applied Optics·2023· 5 citedOpen Access
The Role of Rapid Changes in Weather on Phytoplankton Spring Bloom Dynamics Captured by an Autonomous Uncrewed Surface Vehicle
2023Open Access
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Frequent Co-authors

Jørgen Berge(12), Martin Ludvigsen(9), Finlo Cottier(8), Mark A. Moline(7), Egil Sakshaug(6), Lasse M. Olsen(5), Kasper Hancke(5), Kjersti Andresen(5), Paul E. Renaud(5), Kim S. Last(5), Eva Leu(5), Øystein Varpe(5), Malin Daase(5), Stig Falk‐Petersen(5), Jonathan H. Cohen(5), Alexey K. Pavlov(4), Mats A. Granskog(4), Asgeir J. Sørensen(4), Philipp Assmy(3), Mar Fernández‐Méndez(3)