RELATIONSHIP BETWEEN SST OF THE TROPICAL PACIFIC AND PRECIPITATION OF NORTHWEST CHINA IN SUMMER

In this paper, the data of precipitation of Northwest China in summer was expanded by means of EOF. According to major eigenvectors in expansion the area of Northwest China was divided into four natural rainfall region. Among them the region of greatest precipitation variability is East of Qinghal-North Shaanxi region. The region includes East of Qinghai, Central and East of Gansu,Ningxia and North of Shaanxi. There is apparent teleconnection between the first and second time coefficients by means of EOF expansion and the tropical pacific SST in the corresponding period and earlier months. The variation of the east tropical pacific SST in winter and spring is able to predict precipitation trend of North west of China next summer. Moreover, in the E1 Nino year precipitation trend is opposite to following year, and the region from the East of Qinghai to North of Shaanxi is most sensitive.