印度洋-太平洋各季海温年际变异模的相关性及其与我国夏季降水的关系

简茂球; 罗会邦; 乔云亭

印度洋-太平洋各季海温年际变异模的相关性及其与我国夏季降水的关系

中山大学大气科学系/季风与环境研究中心, 广东, 广州, 510275

基金项目: 国家自然科学基金项目(40175018)

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出版历程
- 收稿日期: 2004-09-30
- 修回日期: 2004-12-12

LINKAGE BETWEEN THE INTERANNUAL VARIATION PATTERNS OF SEASONAL SST IN INDIAN OCEAN-PACIFIC AND THEIR RELATIONSHIP WITH THE SUMMER RAINFALL OVER CHINA

Department of Atmospheric Sciences, Research Center for Monsoon and Environment, Sun Yat-sen University, Guangzhou 510275, China

摘要

摘要: 用1958～1998年NCEP再分析资料、Reynolds海温及中国160站月降水资料分析了印度洋-太平洋不同季节海温年际变异的主要空间分布特征以及它们之间的相互联系,探讨了夏季亚澳季风区海温异常型与我国夏季降水的关系。结果表明:冬季印度洋-太平洋海温年际变化的第一模态与随后春季的第一模态、夏秋季亚澳季风区的海温异常型(第二模态)有非常显著的相关关系,即如果冬季海温异常为ElNiño(La Niña)型,则其后的春季也为ElNiño(LaNiña)型,而随后的夏、秋季在亚澳季风区的热带海温有暖(冷)异常。夏季亚澳季风区海温异常与我国长江中游至江南的夏季降水有显著的正相关,即夏季亚澳季风区热带海温暖(冷)异常对应长江中游及江南的夏季降水偏多(少)。与东亚冬季风异常有关的冬季北太平洋海温异常型,可以通过与夏季亚澳季风区海温的异常有显著相关性进而影响到东亚夏季风。
- 印度洋-太平洋 /
- 海温 /
- 年际变异 /
- 夏季降水
Abstract: Linkage between the interannual variation patterns of seasonal sea surface temperature(SST) in Indian ocean-Pacific and their relationship with the summer rainfall over China are investigated,using the NECP reanalysis data,Reynolds SST and the station rainfalls in China from 1958 to 1998.There exist significant correlation between the dominant mode of SST anomalies in winter(ENSO mode) based on EOF analysis and the dominant mode of SST in following springs,the anomalous modes of SST in Asian-Australian monsoon area in following summers and autumns.It means that when the El Nino(La Nina)-like anomalous pattern of SST occurs in winter in Indian ocean-Pacific,followed by the El Nino(La Nina)-like anomalous pattern of SST in the coming spring,then the positive(negative) anomalous mode of SST appears in the tropical ocean within the Asian-Australian monsoon area in the summer and autumn to come.The anomalous mode of SST in the tropical Asian-Australian monsoon area has significant positive correlation with the summer rainfall over the middle reach of the Yangtze River and the vicinity south to it.The anomalous SST mode in winter in the north Pacific,which is closely related with the anomalous East Asian winter monsoon,may make an impact on the East Asian summer monsoon through its close connection with the summer anomalous mode of SST in the tropical Asian-Australian monsoon area.
- Indian ocean-Pacific /
- sea surface temperature /
- interannual variation /
- summer rainfall

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