Relationship between Atmospheric Heat Source in Tibetan Plateau and Abnormality of Meiyu in Changjiang-Huaihe River Valley
青藏高原大气热源与江淮梅雨异常的关系

Based on the precipitation of Meiyu at 37 stations in the Changjiang-Huaihe River valley and the daily reanalysis geopotential height,wind field,humidity field and surface pressure field data(Grid 2.5°×2.5°) from 1954 to 2001,the relationship between the atmospheric heat source in the Tibetan Plateau and the abnormality of Meiyu in the Changjiang-Huaihe River valley is studied by terms of the fuzzy cluster analysis,EOF,composite analysis,SVD analyses,and so on. The results show that there are notable correlation between the reginal index of Meiyu precipitation in the good(poor) Meiyu year and the atmospheric heat source in the Tibetan Plateau. The atmospheric heat source in the Tibetan Plateau is devided into the east and north patterns according to the 90°E. There are positive or negative correlation between the atmospheric heat source in the Tibetan Plateau and the precipitation in the Changjiang-Huanhe River valley. The atmospheric heat source in the eastern (western) of the Tibetan Plateau is marked increasing(decreasing) while the precipitation is is marked increasing(decreasing) in the Changjiang-Huaihe River valley,and vice verse.