INTERANNUAL CHANGE OF INDIAN SUMMER MONSOON AND THE FEATURES OF ATMOSPHERIC CIRCULATION OF NORTHERN HEMISPHERE

The interannual change of Indian summer monsoon is owing to the results of the relations and influences each other of large-scale atmospheric circulation systems. In this paper, using the data acquired from Mid-Indian rainfall in 1951 to 1985, the four typical years of the stronger monsoon and the six typical years of the weaker monsoon were chosen, in which 500hPa height fields were analyzed by the anomaly synthetic analysis and CEOF (complex empirical orthogonal function) respectively. The results are shown: The stronger monsoon years were related to the stationary high over the Atlantic Ocean and Ochotsk Sea and the appearance of repeatedly trough over Uralskiy mountain. The weaker monsoon years were related to the frequently low systems over the Atlantic Ocean and Ochotsk Sea and the stationary blocking high over European. The spring atmospheric circulation of Northern Hemisphere has appeared some different features for the stronger and weaker Indian summer monsoon years, which will be possible for predicting of the stronger or weaker Indian summer monsoon and the abnormal climate of Northern Hemisphere in same year. The phase function of Northern Hemisphere was large value in the polar region and equatorial low latitude zone, but it was small value in the mid-high latitude for the distinctive seasons of each year of the stronger or weaker summer monsoon in Indian. And then, the disturbances were propagated from the mid-high latitude to the polar and equatorial area.