Now showing items 1-20 of 21

  • Annual cycles of sea level and sea surface temperature in the western Mediterranean Sea 

    Bouzinac, Catherine; Font, Jordi; Johannessen, Johnny A. (American Geophysical Union, 2003-03-01)
    In the western Mediterranean Sea, sea level variations are the result of seasonal steric effect, atmospheric forcing and mesoscale circulation activity, particularly in the Alboran and Algerian basins, as well as water ...
    Journal articlePeer reviewed
  • Coastal ocean fronts and eddies imaged with ERS 1 synthetic aperture radar 

    Johannessen, Johnny A.; Shuchman, Robert A.; Digranes, G.; Lyzenga, D. R.; Wackerman, C.; Johannessen, Ola M.; Vachon, P. W. (American Geophysical Union, 1996-03-15)
    ERS 1 C band synthetic aperture radar (SAR) data were collected during the Norwegian Continental Shelf Experiment (NORCSEX) both in November 1991 during the ERS 1 commissioning phase and at different seasons in 1992 and ...
    Journal articlePeer reviewed
  • Coastal wind field retrievals from ERS synthetic aperture radar images 

    Korsbakken, E.; Johannessen, Johnny A.; Johannessen, Ola M. (American Geophysical Union, 1998-04-15)
    A unique series of European Remote Sensing Satellite (ERS) 1 and 2 C band synthetic aperture radar (SAR) images was obtained off the southern coast of Norway during the Coast Watch’95 experiment in September 1995. In this ...
    Journal articlePeer reviewed
  • COASTWATCH´95: ERS 1/2 SAR detection of natural film on the ocean surface 

    Espedal, Heidi A.; Johannessen, Ola M.; Johannessen, Johnny A.; Dano, E.; Lyzenga, D. R.; Knulst, Johan (American Geophysical Union, 1998-10-15)
    Ocean mesoscale phenomena such as eddies and current convergence zones can often be seen in synthetic aperture radar (SAR) images due to characteristic patterns caused by natural film induced damping of the waves. Such ...
    Journal articlePeer reviewed
  • Direct ocean surface velocity measurements from space: Improved quantitative interpretation of Envisat ASAR observations 

    Johannessen, Johnny A.; Chapron, B.; Collard, F.; Kudryavtsev, Vladimir; Mouchet, A.; Akimov, D.; Dagestad, Knut-Frode (American Geophysical Union, 2008-11-29)
    Previous analysis of Advanced Synthetic Aperture Radar (ASAR) signals collected by ESA’s Envisat has demonstrated a very valuable source of high-resolution information, namely, the line-of-sight velocity of the moving ...
    Peer reviewedJournal article
  • Earth science – oceanography 

    Johannessen, Johnny A.; Sandven, Stein; Durand, Dominique (Kluwer Academic Publishers, 2002)
    Satellite oceanography began with the Gemini XII flight in November 1966. From a Hasselblad camera mounted in the pilot’s window large internal waves in the eastern tropical Atlantic were photographed via sunglitter for ...
  • An ERS 1 synthetic aperture radar image of atmospheric lee waves 

    Vachon, P. W.; Johannessen, Ola M.; Johannessen, Johnny A. (American Geophysical Union, 1994-11-15)
    An ERS 1 synthetic aperture radar (SAR) image of the island Hopen shows a distinct 7.6-km wavelength wave phenomenon near the island. This wave phenomenon is interpreted as the surface imprint on open water of atmospheric ...
    Journal articlePeer reviewed
  • The European gravity field and steady-state ocean circulation explorer satellite mission: its impact on geophysics 

    Johannessen, Johnny A.; Balmino, G.; Le Provost, Christian; Rummel, R.; Sabadini, R.; Sünkel, H.; Tscherning, C. C.; Visser, P.; Woodworth, Philip; Hughes, C. W.; Le Grand, Pascal; Sneeuw, N.; Perosanz, F.; Aguirre-Martinez, M.; Rebhan, Helge; Drinkwater, M. R. (Kluwer Academic Publishers, 2003-07)
    Current knowledge of the Earth’s gravity field and its geoid, as derived from various observing techniques and sources, is incomplete. Within a reasonable time, substantial improvement will come by exploiting new approaches ...
    Journal article
  • Evaluating two numerical advection schemes in HYCOM for eddy-resolving modelling of the Agulhas Current 

    Backeberg, Bjørn C.; Bertino, Laurent; Johannessen, Johnny A. (Copernicus Publications on behalf of the European Geosciences Union, 2009-06-02)
    A 4th order advection scheme is applied in a nested eddy-resolving Hybrid Coordinate Ocean Model (HYCOM) of the greater Agulhas Current system for the purpose of testing advanced numerics as a means for improving the model ...
    Journal article
  • The greater Agulhas Current system: an integrated study of its mesoscale variability 

    Backeberg, Bjørn C.; Johannessen, Johnny A.; Bertino, Laurent; Reason, Chris J.C. (The Institute of Marine Engineering, Science & Technology (IMarEST), 2008-02)
    For the purpose of developing an operational oceanography system for the greater Agulhas Current regime, a high resolution Hybrid Coordinate Ocean Model (HYCOM) has been set in a nested configuration. The intense and complex ...
    Journal article
  • Greenland Sea Odden sea ice feature: Intra-annual and interannual variability 

    Shuchman, Robert A.; Josberger, Edward G.; Russel, Catherine A.; Fischer, Kenneth W.; Johannessen, Ola M.; Johannessen, Johnny A.; Gloersen, Per (American Geophysical Union, 1998-06-15)
    The “Odden” is a large sea ice feature that forms in the east Greenland Sea that may protrude eastward to 5 °E from the main sea ice pack (at about 8 °W) between 73° and 77 °N. It generally forms at the beginning of the ...
    Journal articlePeer reviewed
  • Measuring Ocean Salinity with ESA’s SMOS Mission – Advancing the Science 

    Berger, M.; Camps, A.; Font, Jordi; Kerr, Yann; Miller, J.; Johannessen, Johnny A.; Boutin, J.; Drinkwater, M. R.; Skou, N.; Floury, N.; Rast, M.; Rebhan, Helge; Attema, E. (European Space Agency, 2002-08)
    Journal article
  • Mesoscale Eddies Are Oases for Higher Trophic Marine Life 

    Godø, Olav Rune; Samuelsen, Annette; Macaulay, Gavin J.; Patel, Ruben; Hjøllo, Solfrid Sætre; Horne, John; Kaartvedt, Stein; Johannessen, Johnny A. (Public Library of Science, 2012-01-17)
    Mesoscale eddies stimulate biological production in the ocean, but knowledge of energy transfers to higher trophic levels within eddies remains fragmented and not quantified. Increasing the knowledge base is constrained ...
    Peer reviewedJournal article
  • Microwave Study programs of Air-Ice-Ocean interactive processes in the Seasonal Ice Zone of the Greenland and Barents Seas 

    Johannessen, Ola M.; Campbell, William J.; Shuchman, Robert A.; Sandven, Stein; Gloersen, Per; Johannessen, Johnny A.; Josberger, Edward G.; Haugan, Peter Mosby (American Geophysical Union, 1992)
    Describes the use of satellite ice data into a working technology for the satellite data sets of the recent past and immediate future. Chapters cover basic observations, modeling, geophysical interpretation, and using data ...
  • North Sea circulation: Atlantic inflow and its destination 

    Winther, Nina Gjerde; Johannessen, Johnny A. (American Geophysical Union, 2006-12-22)
    This study investigates the Atlantic inflow to the North Sea; its variabil- ity, pathways and destination. Results from a numerical model show that the variability of Atlantic inflow is dependent on the inflow location. ...
    Journal article
  • Observation and Simulation of Ice Tongues and Vortex Pairs in the Marginal Ice Zone 

    Johannessen, Ola M.; Sandven, Stein; Budgell, W. Paul; Johannessen, Johnny A.; Shuchman, Robert A. (American Geophysical Union, 1994)
    Recognizes the major advancements of the past decade in understanding the interactions among the polar oceans and global atmospheric and oceanic systems. This volume addresses the following topics: Polar Ocean Circulation ...
  • Observing the Ocean from Space: Emerging Capabilities in Europe 

    Johannessen, Johnny A.; Le Provost, Christian; Drange, Helge; Srokosz, Meric; Woodworth, Philip; Sclüssel, Peter; Le Grand, Pascal; Kerr, Yann; Wingham, Duncan; Rebhan, Helge (GODAE Project Office and Bureau of Meteorology, Melbourne, 2001-12)
    During the first decade of the 21st century Earth observation from satellites will be faced with two major demands: provision of continuity missions and launch of new exploratory missions. This paper addresses European ...
  • On effect of wave breaking on short wind waves 

    Kudryavtsev, Vladimir; Johannessen, Johnny A. (American Geophysical Union, 2004-10)
    The paper presents an attempt to estimate short wave generation by wave breaking. A breaking wave crest disturbs the surface and generates sub-surface turbulence. The locally disturbed area further disperses and feeds short ...
    Journal article
  • Sensitivity of remote sensing – derived phytoplankton productivity to mixed layer depth: Lessons from the carbon-based productivity model 

    Milutinović, Svetlana; Behrenfeld, Michael J.; Johannessen, Johnny A.; Johannessen, Truls (American Geophysical Union, 2009-10-01)
    Mixed layer depth (MLD) has long been recognized as having an important influence on underwater light budget and, thus, net primary productivity (NPP) of phytoplankton. The depth- and wavelength-integrated carbon-based ...
    Peer reviewedJournal article
  • Temporal and spatial variability of the sea surface salinity in the Nordic Seas 

    Furevik, Tore; Bentsen, Mats; Drange, Helge; Johannessen, Johnny A.; Korablev, Alexander (American Geophysical Union, 2002-11-02)
    In this paper, the temporal and spatial variability of the sea surface salinity (SSS) in the Nordic Seas is investigated. The data include a Russian hydrographical database for the Nordic Seas and daily to weekly observations ...
    Journal article