1991年江淮梅雨暴雨与亚洲季风的关系

ON THE RELATIONSHIP BETWEEN MEIYU HEAVY RAINFALL OVER THE JIANG HUAI BASIN IN 1991 AND ASIAN MONSOON

关键词:  江淮梅雨  亚洲季风  调制变化

Key words:  Jiang Huai basin Meiyu  Asian monsoon  Modulation variation

摘要:

1991年江淮暴雨分属三个梅雨阶段。使用国家气象中心客观分析的网格点资料,主要用经验正交函数(EOF)展开的方法[6]诊断了梅雨期热带季风和副热带季风强度和进退与暴雨的关系,分析得出:第一阶段暴雨主要与东亚热带季风有关系,而第二、三段暴用主要与印度西南季风有关系;两支热带季风在100-120°E之间热带地区对峙,有利于引发热带季风涌入中国大陆并发生暴雨。

Abstract:

The heavy rainfall over the Jiang Huai basin in 1991 is divided into three Meiyu stages. Employing grid point data of objective analyses from State Meteorological Center, the relationship between the intensity, advancement/retreat of tropical and subtropical monsoon, and heavy rain during the Meiyu is diagnosed with the method of EOF. The analyses show that the first and the second heavy rainfall is mainly related to the tropical monsoon over the East Asia, the third are mainly associated with Indian monsoon. The confrontation of two tropical monsoon in the tropics between 100°E and 120°E is favourable for them into Chinese continent and generate heavy rainfall there.