Characteristics of Precipitation and Classification of Heavy Precipitation Processes during the Rainy Season in Guizhou Province
To explore the spatial and temporal distribution characteristics and evolution patterns of precipitation during the rainy season in Guizhou Province,based on the precipitation data of 81 meteorological stations in Guizhou Province during the rainy season from 1981 to 2020,the spatio-temporal characteristics of the rainy-season precipitation are analyzed and the classification of heavy precipitation processes in Guizhou Province are conducted by means of EOF,REOF and cross wavelet analysis methods.The results show that the average precipitation during the rainy season in Guizhou Province from 1981 to 2020 is 924.9 mm,and the precipitation varies from 682.7 mm to 1 194.1 mm,showing a significant upward trend with a rising rate of 16.94 mm per decade.The precipitation in Guizhou Province during the rainy season generally shows a decreasing trend from southwest to northeast,and the distribution and fluctuation of the frequency and duration of heavy precipitation processes are basically consistent with those of the rainy-season precipitation.Thus,it is seen that the precipitation in Guizhou Province during the rainy season is unevenly distributed with significant interdecadal variations.The spatial field of heavy precipitation during the rainy season in Guizhou Province has three typical modes,namely,the overall consistency type,the east-west reverse type,and the north-south reverse type.By REOF method,Guizhou Province can be spatially subdivided into three heavy precipitation regions.According to the analysis of the atmospheric circulation features,heavy precipitation can be further divided into the eastern type(Type Ⅰ and Type Ⅲ)and the western type(Type Ⅱ).Each type of heavy precipitation region has the influence from the distribution of 500 hPa atmospheric circulation and the source and intensity of 850 hPa water vapor.
precipitation in rainy seasontemporal and spatial characteristicsclassificationGuizhou Province
NETL
NSTL
万方数据
