通辽市2020年7月4-5日局地短时暴雨特征分析  

Analysis on Characteristics of Local Short-time Rainstorm in Tongliao City from 4 to 5 July in 2020

作　　者：贾宁 杨旋 刘梦迪 JIA Ning(Tongliao Meteorological Bureau,Tongliao,Inner Mongolia 028000)

机构地区：[1]通辽市气象局,内蒙古通辽028000

出　　处：《农业灾害研究》2020年第7期36-37,39,共3页Journal of Agricultural Catastrophology

摘　　要：利用通辽市气象观测资料、高空探空资料、c波段雷达资料和风云卫星4A资料对2020年7月4日通辽市科尔沁区大暴雨及5日库伦旗暴雨过程进行分析。两日暴雨均发生在高空槽前的天气尺度背景下,在高温高湿的前期环境中受切变线的触发产生,云图分析上,科区为切变线云带前界处发展的对流云团,库伦旗为较典型飑风云团后向发展型云团。雷达分析上,两日暴雨均受列车效应影响,低层反射率因子较大,利于短时强降水。Based on meteorological observation data,radiosonde data,C-band radar data and Fengyun satellite 4A data in Tongliao City,the heavy rainstorm in Horqin district of Tongliao City on July 4,2020 and the rainstorm process in Kulun banner on July 5,2020 are analyzed.The two-day rainstorm occurred in the synoptic scale background in front of the high-altitude trough,and was triggered by the shear line in the early environment of high temperature and humidity.Among them,the southwest low-level jet continuously transported the water vapor source of Bohai Bay to the central and southern areas of our city,making the low-level water vapor very abundant,which was also an important reason for the local rainstorm in the afternoon of two consecutive days.On the radiosonde map,the inversion layer exists before and after the rainstorm,and the K value and Cape value are larger,which is conducive to the occurrence of convective weather.According to the analysis of cloud picture,kequ is a convective cloud cluster developed at the front boundary of the shear line cloud belt,and Kulun banner is a typical backward developing squall cloud cluster.According to the radar analysis,the two-day rainstorm is affected by the train effect,and the low-level reflectivity factor is large,which is conducive to short-term heavy rainfall.

关 键 词：暴雨 低层切变线 高低空急流 对流云团 列车效应 

分 类 号：P458.121.1[天文地球—大气科学及气象学]