梅雨异常与季风区大尺度环流异常的探讨  

RELATIONSHIPS BETWEEN ANOMALIES OF MEIYU AND LARGE SCALE CIRCULATION IN MONSOON AREA

作　　者：陆菊中[1] 潘益农[1] 

机构地区：[1]南京大学大气科学系,南京210008

出　　处：《应用气象学报》1993年第A12期95-101,共7页Journal of Applied Meteorological Science

基　　金：<长期天气预报理论和方法研究>项目

摘　　要：利用1973—1979年热带地区 u、v 格点资料和1980—1986、1991等年 ECMWF 资料,着重对亚洲季风区大尺度环流系统变异与梅雨异常进行了探讨.结果指出:1.孟加拉湾南部海域越赤道偏南气流的存在和强弱变化是判断梅雨季是否出现异常旱涝的关键.2.梅雨季内出现区域性的持续性暴雨时,赤道附近的纬向环流将发生个一次大调整.3.中国南方夏季风活跃程度,对判断该年梅雨异常旱涝有一定指示意义.By using u and v grid data of tropical region during 1973—1979,ECMWF data dur-ing 1980—1986 and 1991,the variations of large scale circulation system in the Asianmonsoon region and the anomalies of Meiyu are emphatically examined.The resultsshow that:(1) The key to judgement on the anomalies of drought or excessive rainfallin Meiyu season is the existence of and the strength change in the cross-equator by-south flow over the sea area of the Bay of Bengal.(2) When appears the regional sus-tained storm rainfall in Meiyu season,the horizontal circulation nearby equatorial regionwould he subject to a great adjustment process.(3) The activity of summer monsoon inthe south part of China has,to a certain extent,indicative meaning for judgement on theanomalies of Meiyu.

关 键 词：梅雨 季风 大气环流 环流异常 

分 类 号：P434[天文地球—大气科学及气象学]