Now showing items 1-13 of 13

  • Arctic sea ice and Eurasian climate: A review 

    Gao, Yongqi; Sun, Jianqi; Li, Fei; He, Shengping; Sandven, Stein; Yan, Qing; Zhang, Zhongshi; Lohmann, Katja; Keenlyside, Noel; Furevik, Tore; Suo, Lingling (Science Press, 2014-11-28)
    The Arctic plays a fundamental role in the climate system and has shown significant climate change in recent decades, including the Arctic warming and decline of Arctic sea-ice extent and thickness. In contrast to the ...
  • 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 ...
  • 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). ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Marine-based multiproxy reconstruction of Atlantic multidecadal variability 

    Svendsen, Lea; Hetzinger, Steffen; Keenlyside, Noel; Gao, Yongqi (WileyAmerican Geophysical Union, 2014-02-28)
    Atlantic multidecadal variability (AMV) is known to impact climate globally, and knowledge about the persistence of AMV is important for understanding past and future climate variability, as well as modeling and assessing ...
  • On the recent time history and forcing of the inflow of Atlantic Water to the Arctic Mediterranean 

    Nilsen, Jan Even Øie; Hátún, Hjalmar; Sandø, Anne Britt; Bethke, Ingo; Laurantin, Olivier; Gao, Yongqi; Drange, Helge; Furevik, Tore (ACIA, 2004)
  • Simulated North Atlantic-Nordic Seas water mass exchanges in an isopycnic coordinate OGCM 

    Nilsen, Jan Even Øie; Gao, Yongqi; Drange, Helge; Furevik, Tore; Bentsen, Mats (American Geophysical Union, 2003-05-29)
    The variability in the volume exchanges between the North Atlantic and the Nordic Seas during the last 50 years is investigated using a synoptic forced, global version of the Miami Isopycnic Coordinate Ocean Model (MICOM). ...
  • Simulating transport of non-Chernobyl 137Cs and 90Sr in the North Atlantic–Arctic region 

    Gao, Yongqi; Drange, Helge; Bentsen, Mats; Johannessen, Ola M. (Elsevier, 2004)
    The spatial and temporal distributions of the anthropogenic radionuclides 137Cs and 90Sr, originating from nuclear bomb testing and the Sellafield reprocessing plants in the Irish Sea, are simulated using a global version ...
  • Subpolar Gyre Index and the North Atlantic Meridional Overturning Circulation in a Coupled Climate Model 

    Gao, Yongqi; Yu, Lei (Institute of Atmospheric Physics, Chinese Academy of Sciences, 2008-11-16)
    The subpolar gyre index (SPG), derived from the analysis of sea surface height (SSH), is proposed to be a potential indicator for the North Atlantic Meridional Overturning Circulation (AMOC) based on observation as well ...
  • Tracer-derived transit time of the waters in the eastern Nordic Seas 

    Gao, Yongqi; Drange, Helge; Bentsen, Mats; Johannessen, Ola M. (Blackwell Munksgaard, 2005-08-25)
    The spatial-temporal distribution of the anthropogenic radionuclide 137Cs originating from nuclear bomb testing and the Sellafield reprocessing plant in the Irish Sea is simulated using a global version of the Miami Isopycnic ...