2012-2023年喀什地区暖季分级短时强降水时空分布特征OA

Based on hourly precipitation data from 178 meteorological stations in Kashgar from April to October in 2012-2023,this study statistically analyzes the spatiotemporal distribution characteristics of short-term heavy precipitation of different magnitudes in the region.The results show that the frequency of short-term heavy precipitation in Kashgar is distributed in the pattern of north>south>east and shallow mountain areas>plain areas.The terrain is closely associated with short-term heavy precipitation.The short-term heavy precipitation mainly occurred in regions with complex terrain,such as windward slope at mountain fronts,valley,steep terrain,horn-shaped outlets,and transition zones between oasis and the Gobi desert.The interannual variation of short-term heavy precipitation is significant,with the highest frequencies occurring during 2016-2018,2017 recorded the most events(155)and 2012 the fewest(10).The annual variation of short-time heavy precipitation frequency of different magnitudes is generally consistent with the total frequency,all peaking in 2017.On monthly and ten-day scales,the frequency of short-term heavy precipitation exhibits a unimodal distribution,with the highest frequency concentrated in July-August,the cumulative frequency reached its maximum(140 times)in mid-July,while the maximum of extreme rainfall intensity appeared in early August(87.9 mm/h).The diurnal variation displays a bimodal pattern,with the highest frequency from evening to midnight,a secondary peak from midnight to early morning,and the lowest frequency from morning to noon;short-term heavy precipitation of different magnitudes occurs most frequently from 19:00 to 01:00.