渝东北地区暴雨空间分布特征分析

Spatial Distribution Characteristics of Rain-storm in Northeast Chongqing

摘要: 本文利用重庆渝东北地区1960~2015年的9个国家地面气象观测站点降雨观测资料统计分析了区域内暴雨的空间分布特征。得出以下结论：1) 暴雨发生次数呈“西北多，东南少”的特征，开州为暴雨中心，东部和西南部在21世纪后呈减少趋势，城口至云阳、奉节一带呈增长趋势。2) 3~11月暴雨发生相对较大的区域基本都在偏西区域，总体呈“北多南少、西多东少”分布，暴雨中心随着季节整体从南向北移动，进入11月下旬完全消失。

Abstract: Using precipitation observation data of 9 national ordinary stations from 1960 to 2015 in northeast of Chongqing, the spatial distribution of local heavy rain has been statistically studied. The results show that, a) The frequency of heavy rain is higher in northwest and lower in southeast, with Kai-zhou as the center. After 21st century, the east and southwest part experienced lower incidence while the region of Chengkou, Yunyang and Fengjie showed higher incidence. b) The relative higher possibilities of heavy rain from March to November mostly happen in the west part, with an overall distribution as “more in north than south and more in west than east”. The center of heavy rain moves from south to north according to the seasonal time series until its complete disappearance in late November.