2023年7月27—28日太原强对流过程分析  

作　　者：蔡晓芳[1] 

机构地区：[1]太原市气象局,太原030082

出　　处：《科技创新与应用》2024年第19期95-98,共4页Technology Innovation and Application

基　　金：太原市气象局自立项目(TYKY202301)。

摘　　要：利用常规观测资料、探空数据和太原单站雷达数据等,对2023年7月27日太原地区的强对流过程进行分析。结果表明,该次强对流过程以短时强降水和短时暴雨天气为主,主要发生在副高边缘,受到高空槽影响和台风远距离输送水汽产生。充足的水汽和不稳定能量为强降水的发生提供有利条件。夜间高空槽东移,台风北上偏东气流加强,使得中高层更加干冷,低层更加暖湿,层结变得更加不稳定;低层西南和东南2支气流在太原地区交汇,导致该区域更强烈地辐合上升运动,满足强对流发展的动力条件,同时有利于对流在此被触发。雷达图上显示,阳曲境内出现“列车效应”,且风暴质心较低,降水效率高,有利于短时强降水发生。Based on the conventional observation data,sounding data and Taiyuan static radar data,the strong convection process in Taiyuan on July 27,2023 was analyzed.The results show that the strong convective process is dominated by short-term heavy precipitation and short-term rainstorm,which mainly occurs at the edge of the subtropical high,affected by the upper trough and the long-distance transport of water vapor by typhoon.Sufficient water vapor and unstable energy provide favorable conditions for the occurrence of heavy precipitation.At night,the upper trough moves eastward,the typhoon northward and eastward flow strengthens,which makes the middle and upper level drier and colder,the lower layer warmer and wetter,and the stratification becomes more unstable;the lower southwest and southeast branches converge in Taiyuan area,which leads to a stronger convergence and ascending movement in this area,which meets the dynamic conditions for the development of strong convection,and is conducive to convection being triggered here.On the radar map,the"train effect"appears in Yangqu,and the storm centroid is low and the precipitation efficiency is high,which is beneficial to the occurrence of short-term heavy precipitation.

关 键 词：短时强降水 副高边缘 天气 高空槽 雷达 

分 类 号：P44[天文地球—大气科学及气象学]