2003~2015年上海地区夏季午后短时强降水特征

Characteristics of Short-time Heavy Rainfall in Shanghai Region in the Summer Afternoon from 2003 to 2015

结合2003~2015年上海地区11个站点的小时雨量资料,分析了近10年来上海地区夏季午后短时强降水的时空分布特征。结果表明：时间分布上,短时强降水事件主要受太阳辐射和大气环流形势影响,高发期集中在每年的6~9月份,并且易于发生在午后14：00~18：00之间。空间分布上,城市化对上海地区夏季午后短时强降水有一定影响。城市化程度越高,强降水发生的概率也越大。

The characteristics of spatial and temporal distributions of the short-- time heavy rainfall in Shanghai region in the summer afternoon from 2003 to 2015 was studied by using the hourly rainfall data from 11 weather stations. The results showed that： short--time heavy rainfall mainlyoccurredduring June to September, especially during14 to 18pm.Results indicated that the rainfall mainly depended on the weather situations and the sun＇s radiation. Besides that, there was a good corresponding relation between the occurrence frequency of short--time heavy rainfall and ur- banization. The impacts of urbanization increased frequency of occurrence of short--time rainfall in downtown area.