近50年中国汛期暴雨旱涝的分布特征及其成因  

Distribution characteristic of precipitation and rainstorm in flood periods of recent 50 years in China and its formation cause

作　　者：冷春香[1] 陈菊英[1] 

机构地区：[1]中国气象科学研究院,北京100081

出　　处：《自然灾害学报》2005年第2期1-9,共9页Journal of Natural Disasters

基　　金：国家自然科学基金资助项目(10373017)

摘　　要：利用全国160个站点的汛期降水量资料,采用EOF展开并结合聚类相似方法分析了我国汛期旱涝的分布类型和暴雨雨量对每个雨型的多雨带位置和强度的贡献,还探讨了我国汛期主要雨型的500hPa大尺度环流背景。对暴雨和雨型的研究结果表明:主要多雨带中心区域与暴雨总量的显著正距平区域有很好的一致性,这说明我国汛期8个主要多雨带类型的多雨中心主要是由频繁的暴雨造成的。Based on the precipitation data at 160 stations over China during flood season, the distribution pattern of precipitation in flood period and the contribution of the rainstorm amount during flood season to the location and intension of the main rain-bands of every pattern are statistically analyzed. In this paper, the large-scale circulation background at 500hPa of the main precipitation pattern in flood season is also discussed. The main results show that the center area of main rain-bands has good consistence with markedly positive anomaly area of the rainstorm (amount,) so the main rain-bands in flood season are caused by the frequent rainstorms.

关 键 词：汛期暴雨 分布特征 成因 

分 类 号：P429[天文地球—大气科学及气象学]