近60年黑龙江省极端降水事件分布特征OA

In this paper,the daily precipitation data of 33 meteorological stations in Heilongjiang Province from 1960 to 2021 were analyzed by using Tyson polygon,inverse distance weight,Mann-Kendall test and wavelet analysis.The spatial distribution characteristics,time scale trend change,mutability and periodicity of 6 extreme precipitation indexes were systematically studied.The results show that the spatial distribution of extreme precipitation index changes significantly,the precipitation in the north and south of the study area is larger,and the precipitation intensity in the western area is larger.In the confidence interval of 0.05,the abrupt changes of extreme precipitation events mostly occurred in the 1960s and 1980s,and the change center of the main cycle was around 41 years.Human and natural factors greatly affect the change of extreme precipitation index,and extreme precipitation events have certain indicative effects on urbanization process,physical geographical factors and large-scale climate factors.