Now showing items 1-20 of 27

  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Arctic sea ice and climate change - will the sea ice disappear in this century? 

    Johannessen, Ola M.; Miles, Martin W. (Blackwell Scientific Publications, 2000)
  • 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. ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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)
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Evaluating Global Ocean Carbon Models: The Importance of Realistic Physics 

    Doney, S. C.; Lindsay, K.; Caldeira, Ken; Campin, J. M.; Drange, Helge; Dutay, J. C.; Follows, M.; Gao, Yongqi; Gnanadesikan, A.; Gruber, N.; Ishida, A.; Joos, Fortunat; Madec, G.; Maier-Reimer, E.; Marshall, J. C.; Matear, R. J.; Monfray, P.; Mouchet, A.; Najjar, R.; Orr, J. C.; Plattner, G. K.; Sarmiento, J. L.; Schlitzer, R.; Slater, R.; Totterdell, I. J.; Weirig, M. F.; Yamanaka, Y.; Yool, A. (American Geophysical Union, 2004-09-15)
    A suite of standard ocean hydrographic and circulation metrics are applied to the equilibrium physical solutions from 13 global carbon models participating in phase 2 of the Ocean Carbon-cycle Model Intercomparison Project ...
  • Evaluation of ocean carbon cycle models with data-based metrics 

    Matsumoto, K.; Sarmiento, J. L.; Key, R. M.; Aumont, O.; Bullister, J. L.; Caldeira, Ken; Campin, J. M.; Doney, S. C.; Drange, Helge; Dutay, J. C.; Follows, M.; Gao, Yongqi; Gnanadesikan, A.; Gruber, N.; Ishida, A.; Joos, Fortunat; Lindsay, K.; Maier-Reimer, E.; Marshall, J. C.; Matear, R. J.; Monfray, P.; Mouchet, A.; Najjar, R.; Plattner, G. K.; Schlitzer, R.; Slater, R.; Swathi, P. S.; Totterdell, I. J.; Weirig, M. F.; Yamanaka, Y.; Yool, A.; Orr, J. C. (American Geophysical Union, 2004-04-02)
    New radiocarbon and chlorofluorocarbon-11 data from the World Ocean Circulation Experiment are used to assess a suite of 19 ocean carbon cycle models. We use the distributions and inventories of these tracers as quantitative ...
  • 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 ...
  • High northern latitude surface air temperature: comparison of existing data and creation of a new gridded data set 1900–2000 

    Kuzmina, Svetlana I.; Johannessen, Ola M.; Bengtsson, Lennart; Aniskina, Olga G.; Bobylev, Leonid P. (Blackwell Publishing Ltd., 2008-03)
    Detection, attribution and understanding of temperature changes in the high northern latitudes depend on constraining uncertainties and resolving apparent discrepancies in observational data sets. We quantitatively compare ...
  • Inception of the Northern European Ice Sheet due to contrasting ocean and insolation forcing 

    Risebrobakken, Bjørg; Dokken, Trond Martin; Otterå, Odd Helge; Jansen, Eystein; Gao, Yongqi; Drange, Helge (Elsevier, 2007-01)
    About 115,000 years ago the last interglacial reached its terminus and nucleation of new ice sheet growth was initiated. Evidence from the northernmost Nordic Seas indicate that the inception of the last glacial was ...
  • 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 ...