汕尾市区域性暴雨雨团特征分析  

Analysis of the Characteristics of Regional Heavy Rain Clusters in Shanwei

作　　者：林佩贤 陈银兰 苏景华 吴经纬 张毅 LIN Pei-xian;CHEN Yin-lan;SU Jing-hua;WU Jing-wei;ZHANG Yi(Meteorological Bureau of Shanwei,Shanwei 516600;Meteorological Bureau of Haifeng,Haifeng 516400)

机构地区：[1]汕尾市气象局,广东汕尾516600 [2]海丰县气象局,广东海丰516400

出　　处：《广东气象》2023年第6期57-60,64,共5页Guangdong Meteorology

摘　　要：通过对汕尾市区域性暴雨雨团的识别及其特征进行分析,帮助预报员充分认识雨团的变化规律,利用汕尾市2014—2020年4—9月逐小时降水量资料筛选出99个区域性暴雨过程,在此基础上运用基于OPTICS空间聚类的雨团识别方法识别出310个雨团进行分析,其中包含134个中尺度雨团,并对其特征进行分析,分析结果为(1)在区域性暴雨过程的个例中大部分伴有1~3个雨团,其中伴随1个雨团的最多;(2)区域性暴雨雨团的空间频数高值区位于汕尾市城区、陆河县河口镇、陆丰市甲子镇;(3)影响汕尾市的中尺度雨团生命周期随时间增加而减少,主要集中在2~3 h,其空间频数分布和雨团相一致;(4)中尺度雨团的形状主要以长方形为主,中尺度雨团中不同强度的降水量站点频数大致随站数的增加而减少。To help the forecaster to understand the variation patterns of rain clusters fully,this work i⁃dentifies the regional heavy rain clusters of Shanwei and analyzes their characteristics.A total of 99 processes of regional heavy rain were selected based on the data of daily rainfall amounts for the period from April to September in 2014 to 2020,and a sum of 310 rain clusters were identified using the OPTICS spatial cluste⁃ring approach and the characteristics of 134 mesoscale rain clusters were analyzed.The results are shown as follows.(1)Most of the regional heavy rain cases were accompanied with one to three rain clusters,in which one⁃cluster processes took up the majority.(2)For the regional heavy rain clusters,the zones of high spatial frequency were located in the urban districts of Shanwei,the Hekou Town of Luhe County and the Ji⁃azi Town of Lufeng City.(3)For the mesoscale rain clusters that affected Shanwai,the life cycle decreased with time,mostly lasting between two and three hours,with the distribution of its spatial frequency consistent with that of the rain cluster.(4)The mesoscale rain cluster was mainly rectangular⁃shaped,and the fre⁃quency of observation sites that observed different levels of rainfall intensity all roughly decreased with the in⁃crease of the number of sites.

关 键 词：气候学 区域性暴雨 雨团 汕尾市 

分 类 号：P46[天文地球—大气科学及气象学]