江淮北区6～7月降水异常与北太平洋海温的SVD分析

SVD Analyses of the Precipitation of Northern Part over the Changjiang-Huaihe River Valley from June to July and the Sea Surface Temperature in the North Pacific Ocean

REOF结果表明，江淮地区6～7月降水可以分为南、北两个区；江淮北区6～7月降水和海温的SVD分析结果表明：影响江淮北区6～7月降水异常的海温关键区（关键区）是北太平洋海域，关键时段是当年的1～2月；当年1～2月北太平洋关键区海温异常偏高（偏低），同年6～7月中国的江淮、华南、东北地区降水偏多（少），华北、西北、西南呈降水偏少（多），其中江淮北区相关系数绝对值最大，通过0．05的Monte-Carlo显著性水平检验。

Using the Rotated Empirical Orthogonal Function （REOF）, the whole Changjiang-Huaihe region is divided into the Southern area and Northern area according to the first mode of the standardized precipitation departure. The relationship between the precipitation anomalies of Northern area from June to July and the monthly sea surface temperature anomalies （SSTA） are investigated by means of Singular Value Decomposition （SVD） analysis. The results show that Key region lies in North Pacific ocean which influences the precipitation anomaly of Northern area from June to July and the key period of time is from January to February in the same year. SSTA has the best positive correlation with the precipitation in Changiang-Huaihe, in South China and in Northeast China and negative correlation with the precipitation in North China, in Northwest China, in Southwest China.