青海东部春季降水量的经验正交分解特征及与海温和500hPa高度场的相关

本文通过对青海省东部１３个站４－６月降水量进行了ＥＯＦ分解，给出了这一地区季降水的空分布特征，其主要特征向量的时间系数与同期太平洋海温存在明显的遥相关，最后用第一特征向量的时间系数作为表征青海东部春季的旱涝指数，分析了它与前期太平洋海温和５００ｈＰａ高度场的相关，结果发现：前一年春季赤道东太平洋海温和冬季太平洋地区５００ｈＰａ高度对我省东部春季降水有明显的指示意义。

THE CORRELATION ANALYSES BETWEEN THE EMPIRICAL ORTHOGONAL FUNCTION CHARACTERISTICS OF THE SPRING PRECIPITATION IN EASTERN QINGHAI WITH SST AND 500 hPa HEIGHT

Based on the analyses of EOF characteristics by using precipitation from April to June at 13 weather stations in eastern Qinghai,temporal and spatial features of spring precipitation in this region are given. The time coefficient of the main characteristic vector has remotely correlation with Pacific SST during the same period. Meanwhile, using the time coefficient of the first characteristic vector as the dought flood index in spring in eastern Qinghai,we investigated the correlation between it with the previous Pacific SST and 500 hPa height. The results show that the equatorial eastern Pacific SST in spring of last year and the 500 hPa height over Pacific ocean in winter have instructive significance for the spring precipitation forcasting in eastern Qinghai.