长沙地区两次积层混合云降水微物理特征对比与分析  

Comparison and Analysis of Microphysical Characteristics in Mixed Convective-Stratiform Cloud Precipitation over Changsha Area

作　　者：汪玲 唐林 李琼 丁莉 WANG Ling;TANG Lin;LI Qiong;DING Li(Hunan Weather Modification Center,Changsha 410118,China)

机构地区：[1]湖南省人工影响天气中心,湖南长沙410118

出　　处：《成都信息工程大学学报》2024年第5期597-601,共5页Journal of Chengdu University of Information Technology

基　　金：湖南省气象局资助项目(CXFZ2022-QNZX24)。

摘　　要：选取2019年5月12-13日、2020年5月14-15日湖南长沙夏季两次积层混合云强降水过程进行对比与分析。首先对降水特征分析,将降雨过程划分为层状云阶段和对流云阶段,对雨滴谱及雨滴谱特征参数进行对比与分析,并对不同阶段Z-R关系进行拟合计算,结果表明:两次过程不同阶段雨滴谱分布及降水率都不同,层状云降水阶段,降水率小且粒子直径基本不超过3 mm,谱宽较窄;对流云降水阶段,最大瞬时降水率分别高达46.97 mm/h、114.40 mm/h,同时分别观测到5.5 mm、8 mm降水粒子,谱宽较宽;两次过程存在高浓度的小雨滴,其直径主要在1.0 mm左右,降水粒子数在500左右及以下居多,降水粒子数的突然增大会导致短时强降雨出现;对两次过程不同阶段的Z-R关系(Z=AR^(b))进行估计对比,结果也有差距,同阶段,系数A取值变化范围较大,b取值相近在1~2波动,不同阶段,A和b取值都不一样,但对流云阶段A和b取值更大。Based on the comparison and analysis of characteristics of the two heavy precipitation processes in summer over Hunan province in Changsha on May 12-13,2019 and May 14-15,2020,the characteristics of precipitation are analyzed firstly,the processes are divided into two stages:the stratiform cloud stage and the convective cloud stage,the raindrop spectrum and its characteristic parameters are compared and analyzed,the results show that the raindrop distribution and precipitation rate are different in different stages of the two processes.In the stage of stratiform ones,the precipitation rate is small,the particle diameter is below 3 mm,and the spectrum is narrow,while in the stage of convective ones,the maximum instantaneous precipitation rates are as high as 46.97 mm/h and 114.40 mm/h,at the same time,5.5 mm and 8.0 mm precipitation particles are observed and raindrops have a broad spectrum;the number of precipitation particles is about or below 500,and the sudden increase of the number of precipitation particles lead to the appearance of short-term heavy rainfall;The Z-R relation(Z=AR^(b))is different in different stages,at the same stage,the values of coefficient A vary widely,and b is almost consistent and fluctuates from 1 to 2,while at different stages,A and b have different values,but both show that the values of A and b are larger in the stage of convective ones.

关 键 词：雨滴谱 Z-R关系 层积混合云 

分 类 号：P412[天文地球—大气科学及气象学]