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The Effect of Diapycnal Mixing on the Ventilation and CFC-11 Uptake in the Southern ocean

Advances in Atmospheric Sciences 2004年第5期21卷 755-766页

作者： Helge DRANGE Nansen Environmental and Remote Sensing Center Bergen Norway Nansen-Zhu International Research Centre Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029Bjerknes Centre for Climate Research Bergen Norway Geophysical Institute University of Bergen Bergen Norway

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). Three model experiments are performed: one with a diapycnal mixing coefficientK d (m2 s?1) of 2 × 10?7/N (Expt. 1), one withK d = 0 (Expt. 2), and one withK d = 5 × 10?8/N (Expt. 3),N (s?1) is the Brunt-V?is?l? frequency. The model simulations indicate that the observed vertical distribution of CFC-11 along 88°W (prime meridian at 0°E) in the Southern ocean is caused by local ventilation of the surface waters and westward-directed (eastward-directed) isopycnic transport and mixing from deeply ventilated waters in the Weddell Sea region. It is found that at the end of 1997, the simulated net ocean uptake of CFC-11 in Expt. 2 is 25% below that of Expt. 1. The decreased uptake of CFC-11 in the Southern ocean accounts for 80% of this difference. Furthermore, Expts. 2 and 3 yield far more realistic vertical distributions of the ventilated CFC-waters than Expt. 1. The experiments clearly highlight the sensitivity of the Southern ocean surface water ventilation to the distribution and thickness of the simulated mixed layer. It is argued that inclusion of CFCs in coupled climate models could be used as a test-bed for evaluating the decadal-scale ocean uptake of heat and CO2.

关键词： chlorofluorocarbons CFC-11 diapycnal mixing ocean modelling ocean ventilation Southern ocean transient tracers

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NUMERICAL EXPERIMENT ON THE SEASONAL VARIATION OF GLOBAL ocean AND THE EL NINO PROCESS:PARTI:CONTROL EXPERIMENT ON THE SEASONAL VARIATION OF GLOBAL ocean

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Acta meteorologica Sinica 1994年第2期8卷 125-135页

作者：陈隆勋徐俊 Chinese Academy of Meteorological Sciences Beijing 100081 Chinese Academy of Meteorological SciencesBeijing 100081

A 6-layer,4°×5° horizontal resolution global ocean model has been designed and *** a 100-year in- tegration,an equilibrium state has been reached from the upper to lower *** taking the mean state of last l0 mod- el years as climatic state,we analyzed the characteristics of the seasonal variation in our model *** results show that the simulated seasonal variation is similar to the *** the design of our model is ***,us- ing the simulated climatic state of the seasonal variation as the initial state,and the observed stress and thermal state as the atmospheric forcing,we simulated the process of El Nino in 1972—1973 *** simulated results of sea- sonal variation using our model will be presented in part I.

关键词： ocean modelling seasonal variation of ocean El Nino simulation

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