| Interannual variability of Antarctic Oscillation and its influence on East Asian climate during boreal winter and spring |
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| 基金项目： | 中国科学院资助项目;中国科学院资助项目 |
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| 摘 要： | 1 Introduction Antarctic Oscillation is a major mode of Southern Hemispheric (SH) extratropical atmospheric circula- tion. The SH Annual Mode represents a zonally sym- metric exchange of mass between polarward of 60°S and 40°S1], therefore AAO indicates both the intensity of circumpolar low and zonal mean west wind at mid-high latitudes in SH. Positive phase of AAO tends to deepen circumpolar low and enhance west wind at mid-high latitudes in SH. Many studies show that AAO has bar…
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| 收稿时间： | 25 December 2004 |
| 修稿时间： | 15 August 2005 |
Interannual variability of Antarctic Oscillation and its influence on East Asian climate during boreal winter and spring |
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| Authors: | FAN Ke WANG Huijun |
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| Institution: | 1. Nansen-Zhu International Research Center, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;Department of Atmospheric Science, Yunnan University, Kunming 650091, China;Graduate University of the Chinese Academy of Sciences, Beijing 100049, China
2. Department of Atmospheric Science, Yunnan University, Kunming 650091, China |
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| Abstract: | The interannual variability of Antarctic Oscillation (AAO) and its influence on East Asian climate during both boreal winter and spring are addressed. The results show that the positive AAO anomaly decreases the cold activity over East Asia during both boreal winter and spring. AAO-related barotropic meridional teleconnection from Antarctic to Arctic is found through analysis of mean me- ridional circulations. This meridional teleconnection is remarkable over Eurasia during boreal winter and over the Pacific Ocean during boreal spring. The results also show that zonal mean zonal wind at high latitudes in Southern Hemisphere has well positive correlation with that of Eurasia during boreal winter and has negative correlation with Pacific North American teleconnection (PNA) during boreal spring, which again display the meridional teleconnection. Thus, local meridional teleconnection is a possible linkage for interaction of circulations at mid-high latitudes between both hemispheres. |
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| Keywords: | Antarctic Oscillation Eurasian west wind meridional teleconnection mean meridional circu- lation |
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