气候变暖背景下鄂尔多斯市暴雨时空分布特征及灾害防御

Temporal and Spatial Distribution Characteristics of Rainstorm and Disaster Prevention of Ordos City under the Background of Climate Warming

利用NCEP/NCC再分析资料和鄂尔多斯地面自动气象站历史资料分析鄂尔多斯1981—2019年暴雨时空分布特征。结果显示:暴雨分布具有明显的季节变化特征,且气候变暖以后,极端暴雨天气出现频率明显增加。暴雨日数空间分布特征显示,鄂尔多斯市东部地区出现暴雨及大暴雨的频率最高。暴雨对年降水的贡献率较大,尤其是气候变暖后的2016年。针对鄂尔多斯市暴雨时空分布特征,提出暴雨灾害的相关防御措施。

The temporal and spatial distribution characteristics of rainstorm were analyzed using the NCEP/NCC reanalysis data and the historical surface automatic weather station data in Ordos from 1981 to 2019.The results showed that the rainstorm distribution had obvious characteristics of seasonal variation,and the frequency of extreme rainstorm was increased obviously after the climate warming.The spatial distribution of rainstorm days showed that the eastern part of the Ordos had the highest frequency of rainstorm and heavy rainstorm.Rainstorm amount had the highest contribution to the annual precipitation,especially in 2016 after global warming.According to the temporal and spatial distribution characteristics of rainstorm in Ordos,the corresponding preventive measures were put forward.