我国西北夏季降水异常与太平洋海温季节演变的关系

RELATIONSHIP BETWEEN SUMMER PRECIPITATION ANOMALY IN THE NORTH-WESTERN PART OF CHINA AND THE SEASONAL VARIATION OF SEA SURFACE TEMPERATURE IN THE PACIFIC OCEAN

本文利用交叉相关场的EOF分解考查了我国西北夏季降水与太平洋季节海温遥相关的结构。然后分别就我国西北夏季降水偏多年与偏少年对应的各季海温进行了自然正交（EOF）和复自然正交（CEOF）的合成分析,得到了我国西北夏季降水多、寡年对太平洋海温空间分布异常特征的季节演变。最后利用非参数跃变检验诊断了我国西北降水的跃变,并讨论了与太平洋海温跃变的联系。

By using empirical orthogonal function (EOF), the correlation between summer precipitation in the western part of our country and easonal Sea Surface Temperature (SST) was analyzed. With synthetic analysies of EOF and CEOF (complex empirical correlation), this paper discussed the seasonal variation of SST when the precipitation increasing or decreasing, and got some anomalous features of seasonal variation in the space of SST. At last, by using nonparameteric test, the abrupt changes of precipitation was diagnosed and a relationship between such abrupt changes and the changes in SST was discussed.