ENSO与中国东部地区夏季降水相关性年代际变化特征

利用国家气候中心提供的中国160站1951～2000年逐月降水资料，Hadley中心提供的1951～2000年逐月全球海表层温度资料，采用线性相关分析和滑动相关分析方法，探讨了ENSO与中国东部地区夏季降水的年际关系及二者年际关系的年代际变化特征。结果表明，夏季Nino3区海温与中国东部夏季降水年际关系同期相关显著，且二者的年际关系存在明显的年代际变化，年际相关型分3个阶段：，第1阶段(1972年前)为“东西型”，第2阶段(1973～1983年)为“南北型”，第3阶段(1984年后)也为“南北型”。

Interdecadal Features of Correlation Between ENSO and Summer Rainfall in East China

The features of correlation between SST and summer precipitation in East China and its interannual/interdecadal variation were investigated by using NCEP/NCAR reanalysis SST data and precipitation data provided by the national meteorological center. The main results show that there exists obvious synchronous correlation between SST in the Nino 3 region and annual summer rainfall over East China, and the interannual correlation show apparent features of interdecadal variation. It is found by using running correlation technology that interannual correlation between SST in the Nino 3 region and summer rainfall over East China had abrupt changes, which can be described by three periods: before 1972, 1973 to 1983, and after 1984, corresponding to the precipitation pattern changes: east to west, south to north, and south to north.