广西2022年“龙舟水”期间极端暴雨特征及强度分析

Characteristics and intensity analysis of the extreme dragon-boat precipitation in Guangxi in 2022

利用广西91个国家级地面气象观测站和2790个区域自动站降水量观测资料,采用广西区域性暴雨过程综合强度定量评估方法,对2022年“龙舟水”期间区域性极端暴雨过程特征进行分析。结果表明,2022年广西出现了新中国成立以来最强的一次“龙舟水”,期间全区平均累计降雨量为1951年以来同期最多;共出现4次区域性暴雨过程,其中6月16—21日过程综合强度最强。1961—2022年,“龙舟水”期间广西暴雨过程综合强度达到特强等级的过程有24次,特强暴雨过程发生了年代增多变化;62a间,仅2000年和2022年出现了2次特强过程,且2022年的特强过程平均综合强度比2000年过程强。

Using the precipitation observation data of 91 national meteorological observation stations and 2790 regional automatic stations in Guangxi,the characteristics of regional rainstorm process during the dragonboat precipitation period in 2022 were analyzed by using the quantitative assessment method for the comprehensive intensity of regional rainstorm process in Guangxi.The results show that Guangxi experienced the strongest dragon-boat precipitation since the founding of China,and the average cumulative rainfall in the whole region during this period was the highest relative to the same period in history since 1951.There were four regional rainstorm processes,of which the combined intensity of the process from 16 to 21 June was the strongest.There were 24 times that the comprehensive intensity of the rainstorm process in Guangxi reached the level of extraordinarily strong level during the dragon-boat precipitation period from 1961 to 2022,and the process of extraordinarily strong rainstorm underwent an increase in the interannual scale.Only 2 extraordinarily extreme rainstorm processes occurred in 2000 and 2022,and the average comprehensive intensity of the processes in 2022 was stronger than that in 2000.