亚洲季风区大气热源和水汽汇的季节内变化Ⅱ. 水汽汇的季节内变化

研究了北半球初秋（９月）５００ｈＰａ孟加拉湾（１５°Ｎ，８５°Ｅ）与日本海（４０°Ｎ，１３０°Ｅ）的遥相关结构、年际变化及其与热带东风急流、厄尔尼诺事件、中国降水的关系．指出，当孟加拉湾５００ｈＰａ高度上升时，日本海高度下降。这时通常是低南方涛动指数或发生厄尔尼诺、并且在１００ｈＰａ上热带东风入口区为西风距平。这些特征造成中国东部初秋降水偏少。利用这些结果可以清楚地诊断近４０年中发生的厄尔尼诺事件。

CHARACTERISTICS OF THE BAY OF BENGAL THROUGH SEA OF JAPAN TELECONNECTION IN EARLY AUTUMN AND ITS RELATION TO GENERAL CIRCULATION AND CHINA'S PRECIPITATION

Using the ECMWF data of 1980 to 1983, the intraseasonal component of the variation of the atmospheric moisture sink< Q₂ >(Vertically integrated) over Asian monsoon region is examined, including the standard deviation, EOF patterns and the propagation of the oscillation. The results show, consistant with< Q₁ > especially in summer, that the large intraseasonal variance of < Q₂ >is mainly confined over the active monsoon region of Asia and surround areas, and that the main EOF patterns indicate as well the relationship of intraseasonal oscillations between regions of India-Burma, the coast of East China and the western Pacific while the corresponding the EOF time coefficients have that their dominant period ranging from 3O to 60 days. On the other hand, between < Q₂ >and < Q₁ >there exist differences in the features of the intraseasonal variation between < Q₁ >and < Q₂ >especially in winter. The propagational difference of 30-60 day fluctuation over regions of East Asia and South Asia in summer was Found by means of lagged correlation analysis. To some extent, this regional difference indicates the difference of the two Asian monsoon systems.