摘要
In the context of global warming,there are more frequent heavy rainstorms and extraordinary rainstorms,which leads to growingly severe rainstorm disasters.In previous studies,heavy rainstorms and extraordinary rainstorms were classified into rainstorms so that it was impossible to fully grasp the spatiotemporal pattern of heavy rainstorms and extraordinary rainstorms.Therefore,based on the daily precipitation data of 659 meteorological stations in China,this study calculated the rainfall amount,the rain day,and the rainfall intensity of rainstorms,heavy rainstorms,and extraordinary rainstorms in 1951–2010,and analyzed the spatiotemporal patterns of rainstorms,heavy rainstorms,and extraordinary rainstorms in China.The results showed that: In terms of the proportion to the total rainstorms,rainstorms were the largest,followed by heavy rainstorms and extraordinary rainstorms;in terms of time,the rainfall amount,the rain day,and the rainfall intensity of interdecadal rainstorms and heavy rainstorms in China show a dynamic increase trend;in terms of space,only the rainfall amount and rainy days had an expansion trend,while the rainfall intensity did not change much.Temporally,the rainfall amount and the rain day of interdecadal extraordinary rainstorms were characterized by “increase—decline—increase”,while their rain intensity was characterized by “decline-increase-decline”.Spatially,there was no significant change in the rainfall amount,the rain day,and the rainfall intensity of extraordinary rainstorms.In short,rainstorms in China were developing towards extremes,which might be a result of combination of human factors and natural factors.
In the context of global warming, there are more frequent heavy rainstorms and extraordinary rainstorms, which leads to growingly severe rainstorm disasters.In previous studies, heavy rainstorms and extraordinary rainstorms were classified into rainstorms so that it was impossible to fully grasp the spatiotemporal pattern of heavy rainstorms and extraordinary rainstorms.Therefore, based on the daily precipitation data of 659 meteorological stations in China, this study calculated the rainfall amount, the rain day, and the rainfall intensity of rainstorms, heavy rainstorms, and extraordinary rainstorms in 1951–2010, and analyzed the spatiotemporal patterns of rainstorms, heavy rainstorms, and extraordinary rainstorms in China.The results showed that: In terms of the proportion to the total rainstorms, rainstorms were the largest, followed by heavy rainstorms and extraordinary rainstorms; in terms of time, the rainfall amount, the rain day, and the rainfall intensity of interdecadal rainstorms and heavy rainstorms in China show a dynamic increase trend; in terms of space, only the rainfall amount and rainy days had an expansion trend, while the rainfall intensity did not change much.Temporally, the rainfall amount and the rain day of interdecadal extraordinary rainstorms were characterized by "increase—decline—increase", while their rain intensity was characterized by "decline-increase-decline".Spatially, there was no significant change in the rainfall amount, the rain day, and the rainfall intensity of extraordinary rainstorms.In short, rainstorms in China were developing towards extremes, which might be a result of combination of human factors and natural factors.
基金
Sponsored by the National Natural Science Fund(41801064,71790611)
China Postdoctoral Science Foundation(2019T120114,2019M650756)
the Central Asian Atmospheric Science Research Fund(CAAS201804)
