ENSO对亚洲夏季风异常和我国夏季降水的影响

IMPACT OF ENSO ON THE VARIABILITY OF THE SUMMER MONSOON OVER ASIA AND THE SUMMER RAINFALL IN CHINA

首先对ＥＮＳＯ过程中亚洲夏季风环流的变化进行了诊断分析，结果表明在ＥｌＮｉｎｏ事件和ＬａＮｉｎａ事件中亚洲夏季风系统各成员均发生不同程度的变化，甚至出现相反的变异特征。其次，对我国东部地区夏季降水进行了ＥＯＦ分析，并在此基础上分析了赤道太平洋ＳＳ－ＴＡ对我国东部地区夏季降水影响的区域和程度，该影响与ＥＮＳＯ循环的发展阶段密切相关，且在长江中下游地区和华南地区最为显著。

In this paper,the variability of the Asian summer monsoon circulation during the ENSO period is diagnostically analysed.Evidence suggests that every member of the Asian summer monsoon system changed in varying degrees, even,oppositely,during El Nino events and La Nina events. Then, on the basis of the summer rainfall in east China analysed using EOF, both region and extent of impact of the eastern tropical Pacific SSTA on the summer rainfall in East China are analysed. This impact is related closely with the development phase of ENSO cycle,being most notable in the middle lower reaches of Yangtze River and South China.