全球气候背景下厄尔尼诺对中国东部汛期降水的影响

Influence of El Nino Events on Summer Precipitation in East China under Different Climatic Backgrounds

对厄尔尼诺事件进行了定义 ,并详细讨论了不同气候背景下的厄尔尼诺过程对中国东部地区汛期降水的影响。分析发现 :2 0世纪 50年代以来共发生了 1 4次厄尔尼诺事件 ;在 70年代末、80年代初 ,赤道太平洋的海温有一个明显升高的趋势 ;不同气候背景下的厄尔尼诺过程对中国东部汛期降水存在不同的影响 ,但是对长江中下游及江淮地区降水的影响是一致的 ,一般偏少。

The paper describes the definition of El Nino events and discusses the influence of El Nino events on the summer precipitation over East China under different climatic backgrounds.The analysis suggests that 14 El Nino events have occurred since the 1950s and the SST in Equatorial Pacific exhibited a significant increasing trend from the late 1970s to early 1980s.Under different climatic backgrounds El Nino events have different influence on the summer precipitation over East China,but have the same influence-less summer rainfall over the middle and lower reaches of the Changjiang river and the Changjiang-Huaihe valley.