摘要
利用1961-2017年广西91个气象观测站逐日降水量资料,通过定义广西区域性暴雨,采用线性趋势计算、低通滤波等方法,统计分析了广西区域性暴雨过程的变化特征。结果表明:广西区域性暴雨过程发生频率较高,全年各月均可有区域性暴雨过程出现,5-8月为多发期,出现次数占全年总数的74.2%;持续天数在5 d以上的区域性暴雨过程主要出现在6-8月,以6月最多。近57 a,广西年及秋季区域性暴雨过程频次呈显著增加趋势,20世纪90年代以来区域性暴雨过程总体偏多、强度偏强,暴雨范围在30站以上的过程明显增多;近10 a秋季过程频次偏多、强度偏强特征尤为明显。
Base on the daily precipitation data from 91 meteorological stations in Guangxi from 1961 to 2017,the variation characteristics of regional rainstorm processes were analyzed using statistical methods such as a linear trend,a low pass filter analysis and a definition of regional rainstorm.The results show that there is a high frequency of rainstorm processes in Guangxi that happen every month of each year.74.2%of total rainstorm cases in a year occur mainly in May to August,and those cases persisting beyond 5 days mostly happen between June and August especially in June.The frequency of regional rainstorm processes in each year or in fall tends to show a remarkable increasing trend from 1961 to 2017.The rainstorm cases happen more frequently after 1990 s than before,and the processes that the range of rainstorm cases extends to over 30 stations increase more significantly.In the autumns of recent ten years,both of the rainstorm frequency and intensity increase considerably.
作者
李艳兰
黄卓
何洁琳
覃卫坚
LI Yan-lan;HUANG Zhuo;HE Jie-lin;QIN Wei-jian(Guangxi Climate Center,Nanning 530022,China)
出处
《气象与环境学报》
2020年第1期51-57,共7页
Journal of Meteorology and Environment
基金
广西自然科学基金(2017GXNSFBA198165)
国家自然科学基金(41565005)
广西科学研究与技术开发计划项目(桂科攻1598071-14)
广西气象局延伸期气候预测创新团队项目共同资助
关键词
区域性暴雨
低通滤波法
线性趋势
Regional rainstorm
Low pass filter analysis method
Linear trend method
