Now showing items 1-20 of 35

    • 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
    • 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
    • Data assimilation for coastal zone monitoring and forecasting 

      Evensen, Geir; Drange, Helge (Elsevier Science, 1997)
      Chapter
    • Diagnosing and Understanding the AMOC Biases in NorESM 

      Ivanova, Detelina; Bentsen, Mats; Ilicak, Mehmet; Gao, Chuncheng; Drange, Helge (The Authors, 2014)
      We investigate the Atlantic Meridional Overturning Circulation (AMOC) in the Norwegian Earth System Model (NorESM) featuring isopycnal ocean component (MICOM). The Coupled Model Intercomparison Phase 5 (CMIP5) ...
      Conference object
    • 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
    • The Effect of Diapycnal Mixing on the Ventilation and CFC-11 Uptake in the Southern Ocean 

      Gao, Yongqi; Drange, Helge (Science Press, 2004-03-04)
      The Miami Isopycnic Coordinate Ocean Model (MICOM) is used to investigate the effect of diapycnal mixing on the oceanic uptake of CFC-11 and the ventilation of the surface waters in the Southern Ocean (south of 45°S). ...
      Journal article
    • Effects of diapycnal and isopycnal mixing on the ventilation of CFCs in the North Atlantic in an isopycnic coordinate OGCM 

      Gao, Yongqi; Drange, Helge; Bentsen, Mats (Blackwell Munksgaard, 2003)
      Simulated distributions of the chlorofluorocarbons CFC-11 and CFC-12 are used to examine the ventilation of the North Atlantic Ocean in a global version of the Miami Isopycnic Coordinate Ocean Model (MICOM). Three simulations ...
      Journal article
    • Effects of simulated natural variability on Arctic temperature 

      Sorteberg, Asgeir; Furevik, Tore; Drange, Helge; Kvamstø, Nils Gunnar (American Geophysical Union, 2005-09-23)
      A five-member ensemble with a coupled atmospheresea ice-ocean model is used to examine the effects of natural variability on climate projections for the Arctic. The individual ensemble members are initialized from a 300 ...
      Journal article
    • Effects of solar irradiance forcing on the ocean circulation and sea-ice in the North Atlantic in an isopycnic coordinate ocean general circulation model 

      Otterå, Odd Helge; Drange, Helge (Blackwell, 2004)
      The sensitivity of the ocean circulation to changes in solar irradiance is examined using an isopycnic coordinate, global ocean general circulation model (OGCM) coupled to a thermodynamic/dynamic sea-ice model. In the ...
      Journal articlePeer reviewed
    • Effects of solar irradiance forcing on the ocean circulation and sea-ice in the North Atlantic in an isopycnic coordinate ocean general circulation model 

      Otterå, Odd Helge; Drange, Helge (Blackwell, 2004-03)
      The sensitivity of the ocean circulation to changes in solar irradiance is examined using an isopycnic coordinate, global ocean general circulation model (OGCM) coupled to a thermodynamic/dynamic sea-ice model. In the ...
      Journal article
    • 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 ...
      Journal articlePeer reviewed
    • 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 ...
      Journal articlePeer reviewed
    • Future climate change: Modeling and scenarios for the Arctic 

      Kattsov, Vladimir M.; Källén, Erland; Cattle, Howard P.; Christensen, Jens; Drange, Helge; Hanssen-Bauer, Inger; Jóhannesen, Tómas; Karol, Igor; Räisänen, Jount; Svensson, Gunilla; Vavulin, Stanislav (ACIA, 2005-09)
      Chapter
    • 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 ...
      Journal articlePeer reviewed
    • 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. (Springer Verlag, 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, and ...
      Journal article
    • Last Glacial Maximum over China: Sensitivities of climate to paleovegetation and Tibetan ice sheet 

      Jiang, Dabang; Wang, Huijun; Drange, Helge; Lang, Xianmei (American Geophysical Union, 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, ...
      Journal articlePeer reviewed
    • Modeling the middle Pliocene climate with a global atmospheric general circulation model 

      Jiang, Dabang; Wang, Huijun; Ding, Zhongli; Lang, Xianmei; Drange, Helge (American Geophysical Union, 2005-07-27)
      A new climate simulation for the middle Pliocene (ca. 3 Ma BP) is performed by a global grid-point atmospheric general circulation model developed at the Institute of Atmospheric Physics (IAP AGCM) with boundary conditions ...
      Journal articlePeer reviewed
    • Modelling of deep-sea gravity currents using an integrated plume model 

      Alendal, Guttorm; Drange, Helge; Haugan, Peter Mosby (American Geophysical Union, 1994)
      Chapter
    • The North Atlantic Oscillation and greenhouse-gas forcing 

      Kuzmina, Svetlana I.; Bengtsson, Lennart; Johannessen, Ola M.; Drange, Helge; Bobylev, Leonid P.; Miles, Martin W. (American Geophysical Union, 2005-02-17)
      The results of 12 coupled climate models participating in the Coupled Model Intercomparison Project (CMIP2) are compared together with observational data in order to investigate: 1) How the current generation of climate ...
      Journal articlePeer reviewed