近48 a浙江省不同等级降水变化特征分析

Analysis of Variation Characteristics of Precipitation in Different Grades in Zhejiang Province in Recent 48 Years

利用浙江省62站1971—2018年逐日降水资料,从不同等级降水日数、强度等对不同等级降水变化趋势进行了分析。结果表明:浙江省不同等级降水日数主要呈由北向南递增的分布;浙江总降水日数先减少,2009年后有所增加,而降水强度为显著的增加,小雨日数以减少趋势为主。暴雨日数1986年之后呈显著增加趋势,不同等级降水强度均呈现增加趋势;其中对年降水量贡献最大的是中雨,但小雨和中雨的占比均明显减少,暴雨占比增加较快。

Based on the daily precipitation data of 62 stations in Zhejiang Province from 1971 to 2018,the variation trend of precipitation of different grades was analyzed from the days and intensities of precipitation of different grades.The results show that the distribution of precipitation days in different grades in Zhejiang Province is mainly increasing from north to south;the total precipitation days in Zhejiang Province decrease at first and increase after 2009,while the precipitation intensity increases significantly,while the number of light rain days decreases mainly,the number of rainstorm days increases significantly after 1986,while the intensity of precipitation in different grades increases significantly.The proportion of light rain and moderate rain decreased significantly,and the proportion of heavy rain increased rapidly.