滇西短时强降水的时空分布特征

摘要

Hourly precipitation data at 12 stations and radiosonde data in west Yunnan province from 2010 to 2013 were used to statistically com-pute the spatial and temporal distributions of short time heavy rainfall ( hereafter STHR) . Then, the environmental background characteristics of typical STRH were analyzed. The results showed that the general trend of spatial variation of STRH frequency in west Yunnan province exhibited south-north distribution, the maximum was in Longling station. The frequency of STRH in west Yunnan Province showed significant yearly varia-tions. The STRH mainly occurred from May to September. The diurnal variation of STRH showed a maximum around 4:00-05:00. There were five kinds of circulation conceptual models during STHR.%利用2010~2013年滇西12个自动气象站逐时降水资料和高空观测资料，研究了滇西短时强降水的时空分布特征，并分析典型短时强降水过程的环境背景场特征。结果表明，滇西短时强降水的频次的空间变化总体趋势呈南北向分布，大值中心在龙陵站；滇西短时强降水频次有显著的年变化；短时强降水集中发生在5~9月；日变化呈多峰型，最强峰值出现在04：00~05：00；滇西短时强降水存在5种环流概念模型。