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Modeling the impact of Australian Plate drift on Southern hemisphere climate and environment

chinese Science Bulletin 2005年第14期50卷 1495-1502页

作者： zhou botao1,5, zhao ping2, jian zhimin3.& he jinhai4.1. nansen-zhu international research center,{3., chinese academy of sciences, beijing 100029, China 2. institute of Climate and Environment, chinese academy of Meteoro- logical sciences, beijing 100081, China 3. Laboratory of Marine Geology, Tongji University, Shanghai 200092, China 4. Department of atmospheric sciences, Nanjing institute of Meteorol- ogy, Nanjing 210044, China 5. Graduate School of the chinese academy of sciences, beijing 10003., China nansen-zhu international {3. {3. Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Graduate School of the chinese academy of sciences Beijing 100039 China institute of Climate and Environment Chinese Academy of Meteorological Sciences Beijing 100081 China Laboratory of Marine Geology Tongji University Shanghai 200092 China Department of atmospheric sciences Nanjing Institute of Meteorology Nanjing 210044 China

Using a global atmosphere-ocean coupled model with the present-day and 14 MaB.P. oceanic topogra- phy respectively, two experiments are implemented to inves- tigate the effect of different locations of Australian Plate on the atmospheric circulation in middle-high latitudes of the Southern hemisphere. The results show that when Austra- lian Plate lay south at 14 MaB.P., both anticyclone circula- tions in the subtropical oceans and cyclone circulation around 60°-70°S are strengthened. Subtropical highs and circumpolar low pressure appear stronger, which results in much stronger Antarctic Oscillation and shorter period of Antarctic Oscillation Index (AOI) at 14 MaB.P. The rainfall and the surface air temperature also change correspondingly. The precipitation decreases around 40°S and increases around 60°-70°S, and the surface air temperature rises in high latitudes of the South Pacific and descends over the Weddell Sea and its north side. Besides, due to the changes of the temperatures and winds, Antarctic sea ice coverage also changes with its increasing in the Ross Sea and its west re- gions and decreasing in the Weddell Sea.

关键词：半球气候地球环球澳大利亚漂流物海洋地形学

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