Variations of the Summer Somali and Australia Cross-Equatorial Flows and the Implications for the Asian Summer Monsoon

作     者：祝亚丽 

作者机构：Nansen-Zhu International Research CentreInstitute of Atmospheric PhysicsChinese Academy of Sciences Climate Change Research CenterChinese Academy of Sciences 

出 版 物：《Advances in Atmospheric Sciences》 (大气科学进展（英文版）)

年 卷 期：2012年第29卷第3期

页      面：509-518页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 08[工学] 0706[理学-大气科学] 0825[工学-航空宇航科学与技术] 

基　　金：supported by the National Basic Research Program of China(Grant Nos. 2009CB421406 and 2010CB950304) the Special Fund for the Public Welfare Industry (Meteorology Grant Nos. GYHY201006022 and GYHY200906018) the strategic technological program of the Chinese Academy of Sciences (Grant No. XDA05090405) 

主　　题：cross-equatorial flow Asian summer monsoon low-level jet Somali 

摘      要：The temporal variations during 1948-2010 and vertical structures of the summer Somali and Australia cross-equatorial flows （CEFs） and the implications for the Asian summer monsoon were explored in this study. The strongest southerly and northerly CEFs exist at 925 hPa and 150 hPa level, respectively. The low-level Somali （LLS） CEFs were significantly connected with the rainfall in most regions of India （especially the monsoon regions）, except in a small area in southwest India. In comparison to the climatology, the low- level Australia （LLA） CEFs exhibited stronger variations at interannual time scale and are more closely connected to the East Asian summer monsoon circulation than to the LLS CEFs. The East Asian summer monsoon circulation anomalies related to stronger LLA CEFs were associ- ated with less water vapor content and less rainfall in the region between the middle Yellow River and Yangtze River and with more water vapor and more rainfall in southern China. The sea-surface tempera- ture anomalies east of Australia related to summer LLA CEFs emerge in spring and persist into summer, with implications for the seasonal prediction of summer rainfall in East Asia. The connection between the LLA CEFs and East Asian summer monsoon rainfall may be partly due to its linkage with E1 Nino-Southern Oscillation. In addition, both the LLA and LLS CEFs .exhibited interdecadal shifts in the late 1970s and the late 1990s, consistent with the phase shifts of Pacific Decadal Oscillation （PDO）.