AN ANALYSIS OF THE CLIMATE JUMP ON SEASONAL AND ANNUAL ATMOSPHERIC DROUGHT INDEXES OVER CHINA

After the regionalization of the winter, summer and annual Atmospheric Drought Indexes (ADI) over China based on the data of monthly precipitation and monthly mean temperature with the orthogonally Rotated Principal Component (RPC) analysis, the Student's "t" test and other statistic tests were applied to the subsampies of the regional ADI over a time span of 1-2 decades.It was emphasized that a brupt changes were also significant for the winter and annual AD1 in the northern part of China besides for the summer.