近20年四川盆地大暴雨发生的大尺度环流背景  

LARGE-SCALE GENERAL CIRCULATION CHARACTERISTICS OF HEAVY RAIN OF SICHUAN BASIN AT LATEST TWENTY YEARS

作　　者：蒋兴文[1] 王鑫[1,2] 李跃清[1] 陈栋[1] 

机构地区：[1]中国气象局成都高原气象研究所,四川成都610071 [2]四川省气候中心,四川成都610071

出　　处：《长江流域资源与环境》2008年第A01期132-137,共6页Resources and Environment in the Yangtze Basin

基　　金：.国际科技工作项目(2007DFB20210);四川省公益性研究计划项目(2008NG0009);国家重点基础研究发展规划项目2003CB415201);中国气象局气候变化专项(CCSF2007-23);中国气象局成都高原气象研究所基本科研业务费专项项目(BROP200709)

摘　　要：利用1981-2000年四川盆地逐日降雨量资料和ECMWF逐日再分析资料，研究了近20年四川盆地的大暴雨过程。结果表明：四川盆地暴雨按地域可以分为3种类型，即盆西型、盆东型和全盆移动型，近20年里，盆西型暴雨最多，盆东型暴雨最少；四川盆地各种类暴雨发生的大尺度环流背景之间存在明显的差异，不同大尺度环流背景下，东亚主要环流系统之间的配置使得四川盆地的水汽源地和水汽辐合中心明显不同，而水汽辐合中心与暴雨中心相对应，这就决定了各类暴雨的发生地点不同；80年代前后东亚气候系统的年代际变化使东亚主要大尺度环流发生了明显的改变，这种环流的改变使近20年的环流特征更有利于四川盆地西部暴雨的发生。Using the Datasets of daily precipitation and ECMWF reanalysis data from 1981 to 2000,we investigate the heavy rains of Sichuan Basin at the latest twenty years. The results indicate that the heavy rains of Sichuan Basin may summarize to three patterns by arising places,and they are west part of Sichuan Basin,east part of Sichuan Basin, and moving through Sichuan Basin respectively. The happen frequency of the west part of Sichuan Basin is most in recent twenty years,while the east part of Sichuan Basin is least. The general circulations are significant discrepancy among the three sorts of heavy rain. Under the background of different general circulations, the different configuration of the main circulation systems make the original place and the divergence centers of water vapor transportation of Sichuan Basin different,and the centers of water vapor divergence is the same as the centers of heavy rains,that make the different heppening places of different types of heavy rains. Compared with 1960s and 1970s,the numbers of heavy rain on west part of Sichuan Basin is increasing at the latest twenty years, because of the decadal climate system change of east Aria.

关 键 词：四川盆地 大暴雨 大气环流 水汽输送 年代际变化 

分 类 号：P458.121.1[天文地球—大气科学及气象学] TE977[石油与天然气工程—石油机械设备]