80年代前期我国夏季降水的特点及其成因

80年代前期,我国东部地区夏季降水的主要特点是南北少、中间多。主要雨带基本上徘徊在江淮、汉江和渭水流域一带,少雨区在黄河以北和江南南部。分析发现,80年代前期西太平洋副高处于加强西伸、位置偏南的时期,中高纬度经向环流明显,有利于我国夏季降水的这种分布。分析还发现,这一时期西太平洋副高的加强西伸和位置偏南既有它自身的变化特点,也与太阳活动处于高值时期、赤道太平洋冷水区海温增暖及南方涛动指数持续偏低有关。

The summer precipitation features and its cause during early 1980''s in China

During early 1980's, the main characteristics of summer rainfall distribution in the east part of China were: abundary in the central part, and less in the south and north.Main rain belts fluctuated between the reaches of Changjiang an:J Huai-he River, Hanjiang and Weihe River. In this period, west Pacific subtropic high was stronger, its position tended to west and to south.