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Quantifying the Response Strength of the Southern Stratospheric Polar Vortex to Indian Ocean Warming in Austral Summer

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Advances in atmospheric Sciences 2014年第2期31卷 492-503页

作者： LI Shuanglin CHEN Xiaoting Climate Change Research Center and Nansen-Zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of Sciences State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences Shaanxi Provincial Meteorological Observatory

A previous multiple-AGCM study suggested that Indian Ocean Warming （IOW） tends to warm and weaken the southern polar vortex.Such an impact is robust because of a qualitative consistency among the five AGCMs used.However,a significant difference exists in the modeled strengths,particularly in the stratosphere,with those in three of the AGCMs （CCM3,CAM3,and GFS） being four to five times as strong as those in the two other models （GFDL AM2,ECHAM5）.As to which case reflects reality is an important issue not only for quantifying the role of tropical ocean warming in the recent modest recovery of the ozone hole over the Antarctic,but also for projecting its future trend.This issue is addressed in the present study through comparing the models＇ climatological mean states and intrinsic variability,particularly those influencing tropospheric signals to propagate upward and reach the stratosphere.The results suggest that differences in intrinsic variability of model atmospheres provide implications for the difference.Based on a comparison with observations,it is speculated that the impact in the real world may be closer to the modest one simulated by GFDL AM2 and ECHAM5,rather than the strong one simulated by the three other models （CCM3,CAM3 and GFS）.In particular,IOW during the past 50 years may have dynamically induced a 1.0℃ warming in the polar lower stratosphere （～100 hPa）,which canceled a fraction of radiative cooling due to ozone depletion.

关键词： southern hemispheric polar vortex SST atmospheric general circulation models ozone depletion

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Modelling the January and July Climate of 9000 Years before Present

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Advances in atmospheric Sciences 1994年第3期11卷 319-326页

作者：王会军 LASG Institute of Atmospheric Physics Chinese Academy of Sciences Beijing

The January and July climate of 9000 years before present was simulated through a set of perpetual experimentsby means of the newly designed 9 Level atmospheric general circulation Model (AGCM) in the institute of atmospheric Physics (IAP). The results were analysed and compared with previous results simulated by the IAP 2Level AGCM. There exists good agreement between them. It is found that the temperature is higher in July and lower inJanuary in 9000 yBP than that at present. The temperature difference is more obvious in the Northern Hemispherethan in the Southern Hemisphere and greater in July than in January. These results prove the potential abilities of theg-L AGCM in the climate simulation and climate prediction.

关键词： Paleoclimate Modelling. Climate Change atmospheric general circulation models

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