• Hurricane-driven alteration in plankton community size structure in the Gulf of Mexico: A modeling study 

      Gierach, Michelle M.; Subrahmanyam, Bulusu; Samuelsen, Annette; Ueyoshi, Kyozo (Journal article, 2009-04-03)
      This was the first study to analyze phytoplankton and zooplankton community size structure during hurricane passage. A three-dimensional biophysical model was used to assess ecosystem dynamics, plankton biomass, and plankton ...
    • A Hybrid Coordinate Ocean Model for shelf sea simulation 

      Winther, Nina Gjerde; Evensen, Geir (Journal article, 2006-03-03)
      The general circulation in the North Sea and Skagerrak is simulated using the Hybrid Coordinate Ocean Model (HYCOM). Although HYCOM was originally de- veloped for simulations of the open ocean, it has a design which should ...
    • The impact of ensemble filter definition on the assimilation of temperature profiles in the tropical Pacific 

      Leeuwenburgh, O.; Evensen, Geir; Bertino, Laurent (Journal article; Peer reviewed, 2005-10)
      The traditional analysis scheme in the Ensemble Kalman Filter (EnKF) uses a stochastic perturbation or randomization of the measurements which ensures a correct variance in the updated ensemble. An alternative so called ...
    • Indian Ocean: Validation of the Miami Isopycnic Coordinate Ocean Model and ENSO events during 1958–1998 

      Haugen, Vibeke E.; Johannessen, Ola M.; Evensen, Geir (Journal article, 2002-05-25)
      In the Indian Ocean, in situ data are sparse both in time and space. Therefore, numerical models are one of the major tools for further understanding of the ocean circulation. We have implemented, validated, and done a 40 ...
    • Influence of horizontal model grid resolution on the simulated primary production in an embedded primary production model in the Norwegian Sea 

      Hansen, Cecilie; Samuelsen, Annette (Journal article, 2009)
      The purpose of this paper is to investigate the influence of horizontal grid resolution in a physical model on an embedded primary production model. The area for the experiment was along the west coast of Norway, from 60◦N ...
    • The Influence of large convective eddies on the surface-layer turbulence 

      Zilitinkevich, Sergej S.; Hunt, J.C.R; Esau, Igor N.; Grachev, A.A.; Lalas, D.P; Akylas, M.; Joffre, S.M. (Journal article; Peer reviewed, 2006-06)
      Close to the surface large coherent eddies consisting of plumes and downdraughts cause convergent winds blowing towards the plume axes, which in turn cause wind shears and generation of turbulence. This mechanism strongly ...
    • An intercomparison between the surface heat flux feedback in five coupled models, COADS and the NCEP reanalysis 

      Frankignoul, C.; Kestenare, E.; Botzet, M.; Carril, A. F.; Drange, Helge; Pardaens, A.; Terray, L.; Sutton, R. (Journal article; Peer reviewed, 2004-04)
      The surface heat flux feedback is estimated in the Atlantic and the extra-tropical Indo-Pacific, using monthly heat flux and sea surface temperature anomaly data from control simulations with five global climate models, ...
    • An intercomparison of large-eddy simulations of the stable boundary layer 

      Beare, Robert J.; MacVean, Malcolm K.; Holtslag, Albert A. M.; Cuxart, Joan; Esau, Igor N.; Golaz, Jean-Christophe; Jimenez, Maria A.; Khairoutdinov, Marat; Kosovic, Branko; Lewellen, David; Lund, Thomas S.; Lindquist, Julie K.; McCabe, Anne; Moene, Arnold F.; Noh, Yign; Raasch, Siegfried; Sullivan, Peter (Journal article, 2005)
      Results are presented from the first intercomparison of Large-eddy simulation (LES) models for the stable boundary layer (SBL), as part of the GABLS (Global Energy and Water Cycle Experiment Atmospheric Boundary Layer ...
    • Inverse Methods and Data Assimilation in Nonlinear Ocean Models 

      Evensen, Geir (Journal article, 1994-10-01)
      An overview is given of the current status of inverse methods and data assimilation for nonlinear ocean models. The inverse theory for time dependent dynamical models is formulated and the most promising solution methods ...
    • Last Glacial Maximum over China: Sensitivities of climate to paleovegetation and Tibetan ice sheet 

      Jiang, Dabang; Wang, Huijun; Drange, Helge; Lang, Xianmei (Journal article; Peer reviewed, 2003-02-06)
      With the boundary conditions appropriate for the Last Glacial Maximum (LGM), including ice sheets, sea surface temperatures, sea-ice distribution, atmospheric CO2 concentration, the Earth’s orbital parameters, topography, ...
    • 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. (Journal article, 2002-08)
    • Mesoscale modeling study of the oceanographic conditions off the southwest coast of India 

      Haugen, Vibeke E.; Johannessen, Ola M.; Evensen, Geir (Journal article; Peer reviewed, 2002-09)
      A high resolution model, using the Miami Isopycnic Coordinate Ocean Model (MICOM), has been implemented for the first time to study the seasonal circulation and coastal upwelling off the southwest Indian coast during 1974. ...
    • 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 (Geophysical Monograph 68, Chapter, 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 ...
    • Modelling of deep-sea gravity currents using an integrated plume model 

      Alendal, Guttorm; Drange, Helge; Haugan, Peter Mosby (Geophysical Monograph Series; 85, Chapter, 1994)
    • Modes of the southern extension of the East Madagascar Current 

      Siedler, G.; Rouault, M.; Biastoch, A.; Backeberg, Bjørn C.; Reason, Chris J.C.; Lutjeharms, J. R. E. (Journal article, 2008-11-04)
      Data sets from satellite observations and a nested high‐resolution model are used to study a source region of the Agulhas Current. Altimeter‐derived geostrophic surface currents are averaged over varying periods, providing ...
    • Multisensor approach to automated classification of sea ice image data 

      Bogdanov, Andrey V.; Alexandrov, Vitaly Y.; Sandven, Stein; Johannessen, Ola M.; Bobylev, Leonid P. (Journal article; Peer reviewed, 2005-07)
      A multisensor data fusion algorithm based on a multilayer neural network is presented for sea ice classification in the winter period. The algorithm uses European Remote Sensing (ERS), RADARSAT synthetic aperture radar ...
    • 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 (Chapter, 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 ...
    • Ocean data assimilation systems for GODAE 

      Cummings, James; Bertino, Laurent; Brasseur, Pierre; Fukumori, Ichiro; Kamachi, Masafumi; Martin, Matthew J.; Mogensen, Kristian; Oke, Peter; Testut, Charles Emmanuel; Verron, Jaques; Weaver, Anthony (Oceanography, GODAE Special issue feature, Journal article, 2009-09)
      Ocean data assimilation has matured to the point that observations are now routinely combined with model forecasts to produce a variety of ocean products. Approaches to ocean data assimilation vary widely both in terms of ...
    • Ocean release of fossil fuel CO2: A case study 

      Drange, Helge; Alendal, Guttorm; Johannessen, Ola M. (Journal article; Peer reviewed, 2001-07-01)
      The natural ocean uptake of the greenhouse gas CO2 can be accelerated by collecting and liquefying the gas from point sources, and by pumping it into the ocean at appropriate locations and at sufficient depths. Results ...
    • On the effect of a sill on dense water formation in a marginal sea 

      Doroteaciro, Iovino; Fiammetta, Straneo; Spall, Michael A. (Journal article, 2008-05)
      The properties of water mass transformation in a semi-enclosed basin, separated from the open ocean by a sill and subject to surface cooling, are analyzed both theoretically and numerically using an ocean general circulation ...