我国夏半年降水距平与北太平洋海温异常的奇异值分解法分析

THE SINGULAR VALUE DECOMPOSITION ANALYSIS BETWEEN THE SSTA FIELD OVER NORTHERN PACIFIC AND THE PRECIPITATION ANOMALY FIELD DURING SUMMER HALF YEAR IN CHINA

利用奇异值分解法分析了我国夏半年各月降水距平与北太平洋海温异常的相互关系，指出：（１）平均意义上，秋冬季海温与我国春末至盛夏各月降水存在显著的相互关系；（２）秋冬季赤道东太平洋海温对次年４－５月江南东部和７月高原东侧、黄河中下游地区的降水有显著的影响；（３）盛夏至冬季的赤道中东太平洋海温与前一年６月黄淮地区及７月长江流域降水关系密切。

The relationship between the SSTA field over Northern Pacific and the precipitation anomaly during summer half year in China is studied by using singular value decomposition method. The results show that (1) in average, there is significant correlation between the SSTA fields in autumn and winter and rainfall for each month from the end of spring to midsummer in China;(2) the SSTA field in the equatorial eastern Pacific during autumn-winter has strong influence on the rainfall in April and May in the coming year for the eastern part of the Yangtze River Valley and in the following July for the eastern Plateau and middle-and-lower reaches of the Yellow River; (3) there is close relationship between SSTA field in the middle and eastern equatorial Pacific from the prime of the summer to winter and the rainfall for the Yellow River and Huaihe River Valley and the Yangtze River Valley in the preceding June or July, respectively.