ENSO对亚洲夏季风环流和中国夏季降水影响的诊断研究

DIAGNOSTIC RESEARCH OF THE EFFECTS OF ENSO ON THE ASIAN SUMMER MONSOON CIRCULATION AND THE SUMMER PRECIPITATION IN CHINA

中文关键词:  联合SVD方法  统计检验  亚洲季风环流  中国夏季降水

英文关键词:CSVD  Statistic test  Asian summer monsoon circulation  Summer precipitation in China

中文摘要:

      文中以SVD分析技术为基础,发展了一种用以提取一个矢量场和一个标量场耦合信号的统计诊断方法--联合SVD方法(简记为CSVD),并运用CSVD分析了ENSO对亚洲季风环流系统及中国夏季降水的年际变化的影响。结果表明,在El Nino年,印度夏季风减弱,东亚夏季风增强;而在LaNina年,印度夏季风增强,东亚夏季风减弱。且ENSO对亚洲夏季风环流影响显著的区域主要在长江流域南北气流交汇区和索马里急流区,而对中国夏季降水影响最显著的区域则在江淮流域。

英文摘要:

      Based on SVD (singular value decomposition), CSVD(combined SVD) used to examine the correlation of a vector field and a scal ar field is developed in this paper. With CSVD, the effects of ENSO on the Asian summer monso on cir culation and the summer precipitation in China are examined. The results show that, in an El Nino year, the Indian summer monsoon is subsided, the eastern Asian summer monso on is st rengt hened. On the contrary, in a La Nina year, the Indian summer monsoon is enhanced while the eastern A sian summer monsoon is abated. The areas mostinfl uenced by the tropical middle-east Pacific SST Amainly lies on the Yangtze rivervaley the converging area of the north and the southair stream and the Somalia jetarea. And the most significantly affected area of ENSO to the summer precipitation in China is the Yangtze and the Huaihe river valley.