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Bergen Open Research Archive

Browsing by Author "Johannessen, Johnny A."

Bergen Open Research Archive

Browsing by Author "Johannessen, Johnny A."

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  • Bouzinac, Catherine; Font, Jordi; Johannessen, Johnny A. (Journal article; Peer reviewed, 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 ...
  • Johannessen, Johnny A.; Shuchman, Robert A.; Digranes, G.; Lyzenga, D. R.; Wackerman, C.; Johannessen, Ola M.; Vachon, P. W. (Journal article; Peer reviewed, 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 ...
  • Korsbakken, E.; Johannessen, Johnny A.; Johannessen, Ola M. (Journal article; Peer reviewed, 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 ...
  • Espedal, Heidi A.; Johannessen, Ola M.; Johannessen, Johnny A.; Dano, E.; Lyzenga, D. R.; Knulst, Johan (Journal article; Peer reviewed, 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 ...
  • Johannessen, Johnny A.; Chapron, B.; Collard, F.; Kudryavtsev, Vladimir; Mouchet, A.; Akimov, D.; Dagestad, Knut-Frode (Peer reviewed; Journal article, 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 ...
  • Johannessen, Johnny A.; Sandven, Stein; Durand, Dominique (Chapter, 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 ...
  • Vachon, P. W.; Johannessen, Ola M.; Johannessen, Johnny A. (Journal article; Peer reviewed, 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 ...
  • 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. (Journal article, 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 ...
  • Backeberg, Bjørn C.; Bertino, Laurent; Johannessen, Johnny A. (Journal article, 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 ...
  • Backeberg, Bjørn C.; Johannessen, Johnny A.; Bertino, Laurent; Reason, Chris J.C. (Journal article, 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 ...
  • Shuchman, Robert A.; Josberger, Edward G.; Russel, Catherine A.; Fischer, Kenneth W.; Johannessen, Ola M.; Johannessen, Johnny A.; Gloersen, Per (Journal article; Peer reviewed, 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 ...
  • 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. (Journal article, European Space Agency, 2002-08)
  • Godø, Olav Rune; Samuelsen, Annette; Macaulay, Gavin J.; Patel, Ruben; Hjøllo, Solfrid Sætre; Horne, John; Kaartvedt, Stein; Johannessen, Johnny A. (Peer reviewed; Journal article, 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 ...
  • Johannessen, Ola M.; Campbell, William J.; Shuchman, Robert A.; Sandven, Stein; Gloersen, Per; Johannessen, Johnny A.; Josberger, Edward G.; Haugan, Peter Mosby (Chapter, 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 ...
  • Winther, Nina Gjerde; Johannessen, Johnny A. (Journal article; Peer reviewed, 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. ...
  • Johannessen, Ola M.; Sandven, Stein; Budgell, W. Paul; Johannessen, Johnny A.; Shuchman, Robert A. (Chapter, 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 ...
  • Johannessen, Johnny A.; Le Provost, Christian; Drange, Helge; Srokosz, Meric; Woodworth, Philip; Sclüssel, Peter; Le Grand, Pascal; Kerr, Yann; Wingham, Duncan; Rebhan, Helge (Chapter, 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 ...
  • Kudryavtsev, Vladimir; Johannessen, Johnny A. (Journal article; Peer reviewed, 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 ...
  • Kudryavtsev, Vladimir; Akimov, D.; Johannessen, Johnny A.; Chapron, B. (Journal article; Peer reviewed, American Geophysical Union, 2005-07-22)
    A new radar imaging model of ocean current features is proposed. The simulated normalized radar cross section (NRCS) takes into account scattering from ‘‘regular’’ surfaces (by means of resonant Bragg scattering and ...
  • Johannessen, Johnny A.; Kudryavtsev, Vladimir; Akimov, D.; Eldevik, Tor; Winther, Nina Gjerde; Chapron, B. (Journal article; Peer reviewed, American Geophysical Union, 2005-07-22)
    The surface signatures of meandering fronts and eddies have been regularly observed and documented in synthetic aperture radar (SAR) images. Wave-current interactions, the suppression of short wind waves by natural film, ...

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