Now showing items 1-20 of 93

    • Analysis of merged SMMR-SSMI time series of Arctic and Antarctic sea ice parameters 1978-1995 

      Bjørgo, Einar; Johannessen, Ola M.; Miles, Martin W. (American Geophysical Union, 1997-02-15)
      The most consistent means of investigating the global sea ice cover is by satellite passive microwave sensors, as these are independent of illumination and cloud cover. The Nimbus 7 Scanning Multichannel Microwave Radiometer ...
      Journal articlePeer reviewed
    • Annual carbon fluxes in the upper Greenland Sea based on measurements and a box-model approach 

      Anderson, Leif G.; Drange, Helge; Chierici, M.; Fransson, A.; Johannessen, Truls; Skjelvan, Ingunn; Rey, Francisco (Blackwell, 2000-07)
      Measurements of nitrate and the carbonate system parameters performed mainly from 1993 to 1997 have been used to estimate the evolution of the concentration fields over the year in the surface and underlying waters of ...
      Journal articlePeer reviewed
    • 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
    • Application of a hybrid EnKF-OI to ocean forecasting 

      Counillon, François; Sakov, Pavel; Bertino, Laurent (Copernicus Publications on behalf of the European Geosciences Union, 2009-10-01)
      Data assimilation methods often use an ensemble to represent the background error covariance. Two approaches are commonly used; a simple one with a static ensemble, or a more advanced one with a dynamic ensemble. The latter ...
      Journal article
    • Arctic climate change: observed and modelled temperature and sea-ice variability 

      Johannessen, Ola M.; Bengtsson, Lennart; Miles, Martin W.; Kuzmina, Svetlana I.; Semenov, Vladimir A.; Alekseev, Genrikh V.; Nagurnyi, Andrei P.; Zakharov, Victor F.; Bobylev, Leonid P.; Pettersson, Lasse H.; Hasselmann, Klaus; Cattle, Howard P. (Blackwell Munksgaard, 2004-07-09)
      Changes apparent in the arctic climate system in recent years require evaluation in a century-scale perspective in order to assess the Arctic's response to increasing anthropogenic greenhouse-gas forcing. Here, a new set ...
      Peer reviewedJournal article
    • Arctic sea ice and climate change - will the sea ice disappear in this century? 

      Johannessen, Ola M.; Miles, Martin W. (Blackwell Scientific Publications, 2000)
      Journal articlePeer reviewed
    • Arctic/Atlantic exchanges via the Subpolar Gyre 

      Langehaug, Helene Reinertsen; Medhaug, Iselin; Eldevik, Tor; Otterå, Odd Helge (American Meteorological Society, 2012)
      In the present study we investigate the decadal variability in the strength and shape of the Subpolar Gyre (SPG) in a 600-year pre-industrial simulation using the Bergen Climate Model. The atmospheric influence on the ...
      Journal article
    • Barents Sea seasonal ice zone features and processes from ERS 1 synthetic aperture radar: Seasonal Ice Zone Experiment 1992 

      Sandven, Stein; Johannessen, Ola M.; Miles, Martin W.; Pettersson, Lasse H.; Kloster, Kjell (American Geophysical Union, 1999-07-15)
      Sea ice features and processes in the Barents Sea were studied during the Seasonal Ice Zone Experiment 1992 (SIZEX92), a dedicated ERS 1 satellite synthetic aperture radar (SAR) field campaign carried out in March 1992. ...
      Journal articlePeer reviewed
    • A brief history of climate – the northern seas from the Last Glacial Maximum to global warming 

      Eldevik, Tor; Risebrobakken, Bjørg; Bjune, Anne Elisabeth; Andersson, Carin; Birks, Harry John Betteley; Dokken, Trond Martin; Drange, Helge; Glessmer, Mirjam Sophia; Li, Camille; Nilsen, Jan Even Øie; Otterå, Odd Helge; Richter, Kristin; Skagseth, Øystein (Elsevier, 2014-12)
      The understanding of climate and climate change is fundamentally concerned with two things: a well-defined and sufficiently complete climate record to be explained, for example of observed temperature, and a relevant ...
      Journal article
    • Changes in the properties and distribution of the intermediate and deep waters in the Fram Strait 

      Langehaug, Helene Reinertsen; Falck, Eva (Elsevier, 2012-04)
      The Fram Strait is the only deep connection between the Arctic Ocean and the Nordic Seas (Greenland, Iceland, and Norwegian Seas), with a sill depth of approximately 2600 m. Consequently, observations from this area ...
      Journal article
    • Climate change in the North – past, present and future 

      Thiede, Jörn; Johannessen, Ola M. (International Union of Geological Sciences (IUGS), 2008-03)
      The Nordic countries have produced famous polar explorers and researchers who have generated climate research schools at a variety of locations. The dependence of these countries with respect to the lifelihood of their ...
      Journal article
    • 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
    • Cover ERS-1/2 SAR monitoring of dangerous ice phenomena along the western part of Northern Sea Route 

      Johannessen, Ola M.; Sandven, Stein; Kloster, Kjell; Pettersson, Lasse H.; Melentyev, V. V.; Bobylev, Leonid P.; Kondratyev, K. Ya. (Taylor & Francis, 1997-08-01)
      Journal articlePeer reviewed
    • Cover ERS-1/2 SAR monitoring of dangerous ice phenomena along the western part of Northern Sea Route 

      Johannessen, Ola M.; Sandven, Stein; Kloster, Kjell; Pettersson, Lasse H.; Melentyev, V. V.; Bobylev, Leonid P.; Kondratyev, K. Ya. (Taylor & Francis, 1997-08-01)
      Journal article
    • Critical vulnerabilities of marine and sea ice–based ecosystems in the high Arctic 

      Johannessen, Ola M.; Miles, Martin W. (Springer, 2010-12-01)
      The objectives of this paper are to summarise: (1) observed 20th-century and projected 21st-century changes in key components of the Arctic climate system and (2) probable impacts on the Arctic marine environment, with ...
      Peer reviewedJournal article
    • Decreasing Arctic Sea Ice Mirrors Increasing CO2 on Decadal Time Scale 

      Johannessen, Ola M. (Institute of Atmospheric Physics, Chinese Academy of Sciences, 2008-11-16)
      Arctic sea ice is a keystone indicator of greenhouse-gas induced global climate change, which is expected to be amplified in the Arctic. Here we directly compare observed variations in arctic sea-ice extent and CO2 since ...
      Journal article
    • Diagnosing ocean tracer transport from Sellafield and Dounreay by equivalent diffusion and age 

      Orre, Steinar; Gao, Yongqi; Drange, Helge; Deleersnijder, Eric (Science Press, 2008-09-27)
      A simple approach for estimating the equivalent diffusion for diagnosing tracer transport is proposed. Two different expressions are derived; one is based directly on an analytical solution of the two-dimensional ...
      Peer reviewedJournal article
    • Diapycnal Mixing in a Conceptual Model of the Atlantic Meridional Overturning Circulation 

      Marzeion, Ben; Drange, Helge (Elsevier Science, 2006)
      A three-box model of the Atlantic Ocean is used to examine the influence different parameterisations of the diapycnal mixing may have on the large scale dynamics of the ocean circulation. Special emphasis is given to the ...
      Journal article