• Arctic Sea level Budget Assessment During the GRACE/Argo Time Period 

      Raj, Roshin Pappukutty; Andersen, Ole Baltazar; Johannessen, Johnny Andre; Benjamin, Gutknech; Chatterjee, Sourav; Rose, Stine; Bonaduce, Antonio; Horwath, Martin; Ranndal, Heidi; Richter, Kristin; Palanisamy, Hindumathi; Ludwigsen, Carsten; Bertino, Laurent; Nilsen, Jan Even Øie; Knudsen, Per; Hogg, Anna E.; Cazenave, Anny; Benveniste, Jérôme (Journal article; Peer reviewed, 2020)
      Sea level change is an important indicator of climate change. Our study focuses on the sea level budget assessment of the Arctic Ocean using: (1) the newly reprocessed satellite altimeter data with major changes in the ...
    • Evolving the global ocean observing system for research and application services through international coordination 

      Sloyan, Bernadette M.; Wilkin, John; Hill, Katherine L.; Chidichimo, Maria Paz; Cronin, Meghan F; Johannessen, Johnny Andre; Karstensen, Johannes; Krug, Marjolaine; Lee, Tong; Oka, Eitarou; Palmer, Matthew D.; Rabe, Benjamin; Speich, Sabrina; von Schuckmann, Karina; Weller, Robert A; Yu, Weidong (Peer reviewed; Journal article, 2019-08-06)
      Climate change and variability are major societal challenges, and the ocean is an integral part of this complex and variable system. Key to the understanding of the ocean’s role in the Earth’s climate system is the study ...
    • Knowledge Gaps and Impact of Future Satellite Missions to Facilitate Monitoring of Changes in the Arctic Ocean 

      Lucas, Sylvain; Johannessen, Johnny Andre; Cancet, Mathilde; Pettersson, Lasse H; Esau, Igor; Rheinlænder, Jonathan Winfield; Ardhuin, Fabrice; Chapron, Bertrand; Korosov, Anton; Collard, Fabrice; Herlédan, Sylvain; Olason, Einar; Ferrari, Ramiro; Fouchet, Ergane; Donlon, Craig (Journal article; Peer reviewed, 2023)
      Polar-orbiting satellite observations are of fundamental importance to explore the main scientific challenges in the Arctic Ocean, as they provide information on bio-geo-physical variables with a denser spatial and temporal ...
    • A Neural Network Method for Retrieving Sea Surface Wind Speed for C-Band SAR 

      Yu, Peng; Xu, Wenxiang; Zhong, Xiaojing; Johannessen, Johnny Andre; Yan, Xiao-Hai; Geng, Xupu; He, Yuanrong; Lu, Wenfang (Journal article; Peer reviewed, 2022-05-08)
      Based on the Ocean Projection and Extension neural Network (OPEN) method, a novel approach is proposed to retrieve sea surface wind speed for C-band synthetic aperture radar (SAR). In order to prove the methodology with a ...
    • Ocean Mesoscale Variability: A Case Study on the Mediterranean Sea From a Re-Analysis Perspective 

      Bonaduce, Antonio; Cipollone, Andrea; Johannessen, Johnny Andre; Staneva, Joanna; Raj, Roshin Pappukutty; Aydogdu, Ali (Journal article; Peer reviewed, 2021)
      The mesoscale variability in the Mediterranean Sea is investigated through eddy detection techniques. The analysis is performed over 24 years (1993–2016) considering the three-dimensional (3D) fields from an ocean re-analysis ...
    • On the Use of Dual Co-Polarized Radar Data to Derive a Sea Surface Doppler Model - Part 2: Simulation and Validation 

      Fan, Shengren; Zhang, Biao; Moiseev, Artem; Kudryavtsev, Vladimir; Johannessen, Johnny Andre; Chapron, Bertrand (Journal article; Peer reviewed, 2023)
      The Doppler shift obtained from synthetic aperture radar (SAR) measurements comprises the combined contribution to the radial motion of the ocean surface induced by the sea state (wind waves and swell) and underlying surface ...
    • Particle aggregation at the edges of anticyclonic eddies and implications for distribution of biomass 

      Samuelsen, Annette; Hjøllo, Solfrid Sætre; Johannessen, Johnny Andre; Patel, Ruben (Peer reviewed; Journal article, 2012-06-14)
      Acoustic measurements show that the biomass of zooplankton and mesopelagic fish is redistributed by mesoscale variability and that the signal extends over several hundred meters depth. The mechanisms governing this ...
    • Towards Retrieving Reliable Ocean Surface Currents in the Coastal Zone From the Sentinel-1 Doppler Shift Observations 

      Moiseev, Artem; Johannessen, Johnny Andre; Johnsen, Harald (Journal article; Peer reviewed, 2022)
      Recent developments on calibration and partitioning of the signal between the wave and current contributions significantly improve the accuracy of geophysical retrievals from Sentinel-1 Synthetic Aperture Radar-based Doppler ...