Now showing items 30-49 of 62

    • 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 ...
    • On the Velocity Gradient in Stably Stratified Sheared Flows. Part 2: Observations and Models 

      Kouznetsov, Rostislav D.; Zilitinkevich, Sergej S. (Peer reviewed; Journal article, 2010-05-12)
      Observations of the dependence of the dimensionless wind speed gradient φm as a function of the Monin–Obukhov stability parameter z/Lo under strong stability diverge from results of large-eddy simulation (LES) modelling. ...
    • Open Boundary Conditions for the Extended Kalman Filter With a Quasi-Geostrophic Ocean Model 

      Evensen, Geir (Journal article, 1993-05-18)
      The formulation of consistent boundary conditions for the quasi-geostrophic (QG) model with an extended Kaiman filter in a data assimilation scheme is discussed. To form a well-posed boundary value problem for the QG model, ...
    • Parameter Estimation Solving a Weak Constraint Variational Formulation for an Ekman Model 

      Eknes, Mette; Evensen, Geir (Journal article, 1997-06-15)
      A weak constraint variational formulation is used for inverse calculations and parameter estimation in a one-dimensional Ekman model. When parameters in the model are allowed to contain errors, the inverse problem becomes ...
    • Passive tracers and active dynamics - a model study of hydrography and circulation in the northern North Atlantic 

      Mauritzen, C.; Hjøllo, Solfrid Sætre; Sandø, Anne Britt (Journal article; Peer reviewed, 2006-08)
      A long-standing problem in oceanography has been to understand the relationship between what can be measured in the ocean, such as hydrography, and what cannot, such as the strength and structure of the complete Meridional ...
    • A preliminary study on the relationship between Arctic Oscillation and daily SLP variance in the Northern hemisphere during wintertime 

      Gong, Daoyi; Drange, Helge (Journal article; Peer reviewed, 2005-01-20)
      In the present study, the authors investigated the relationship between the Arctic Oscillation (AO) and the high-frequency variability of daily sea level pressures in the Northern Hemisphere in winter (November through ...
    • Remote sensing of sea ice 

      Breivik, Lars-Anders; Carrieres, Tom; Eastwood, Steinar; Fleming, Andrew; Girard-Ardhuin, Fanny; Karvonen, Juha; Kwok, Ron; Meier, Walter N.; Mäkynen, Marko; Pedersen, Leif Toudal; Sandven, Stein; Similä, Markku; Tonboe, Rasmus (OceanObs’09 Community White Paper, Conference object, 2009-09)
    • Resistance and heat-transfer laws for stable and neutral planetary boundary layers: old theory advanced and re-evaluated 

      Zilitinkevich, Sergej S.; Esau, Igor N. (Journal article; Peer reviewed, 2005-07)
      The planetary boundary layer (PBL) resistance and heat-transfer laws express the surface fluxes of momentum and heat through the PBL governing parameters. Since the late sixties, the dimensionless coefficients (A, B and ...
    • Satellite detection of natural films on the ocean surface 

      Espedal, Heidi A.; Johannessen, Ola M.; Knulst, Johan (Journal article; Peer reviewed, 1996-11-01)
      Natural films on the ocean surface influence air-sea fluxes of momentum, heat, and gas. It is therefore essential to be able to map the geographical extent and variability of such films to determine the resulting impact ...
    • Sea ice investigations in the Laptev Sea area in late summer using SAR data 

      Sandven, Stein; Dalen, Ø.; Lundhaug, M.; Kloster, Kjell; Alexandrov, Vitaly Y.; Zaitsev, L. V. (Journal article; Peer reviewed, 2001-10)
      The Laptev Sea area, including the Vilkitsky Strait, is an important part of the Northern Sea Route where the presence of sea ice makes navigation difficult even in the summer season. The objective of this study was therefore ...