夏季华南降水与水汽输送气流及大气加热场的关系

ELATION OF SOUTH CHINA PRECIPITATION TO LARGE SCALE WATER TRANSPORTING FLOWS AND ATMOSPHERIC HEATING FIELDS

利用ＥＣＭＷＦ／ＷＭＯ逐日资料分析了１９８２年夏季大尺度水汽输送气流、大气加热场与华南降水的关系。结果表明，来自印度洋、孟加拉湾和西太平洋的两支水汽输送气流都具有３０～６０天振荡特征，并共同影响华南地区的降水；夏季风建立后，华南强降水过程与其上空的加热场有良好的对应关系；视热源与水汽汇的加强（减弱）对应华南地区多（少）雨期。

Using ECMWF/WMO daily data of the summer of 1982,the relation of SouthChina rainfall to large-scale water transporting flows and the atmospheric heating environ-ment is investigated.Results show that the intraseasonal(30～60day) oscillation of the flowsfrom the Bay of Bengal and the western Pacific can modulate the South China precipitationand that the rainfall is well correlated with the atmospheric heating field. After the estabil-ishment of summer monsoon the intense rainfall over South Chnia is highly associated withthe heating condition of the region,the intensification (weakening) of the apparent heatsource and the moisture sink corresponding to the abundant(deficient) precipitation in thispart of China.