一次影响江西的对流过程分析及数值模拟  

Analysis and Numerical Simulation of a Convection ProcessInfluencing Jiangxi

作　　者：刘雅楠 戴震天 蒋璐君 曹倩 LIU Yanan;DAI Zhentian;JIANG Lujun;CAO Qian(Meteorological Sciences Institute of Jiangxi,Nanchang330046,China;Key Laboratory of Climate Change Risk and Meteorological Disaster Prevention of Jiangxi Province,Nanchang330046,China;Nanchang Meteorological Bureau,Nanchang 330038,China)

机构地区：[1]江西省气象科学研究所,江西南昌330096 [2]气候变化风险与气象灾害防御江西省重点实验室,江西南昌330096 [3]南昌市气象局,江西南昌330038

出　　处：《沙漠与绿洲气象》2024年第6期99-107,共9页Desert and Oasis Meteorology

基　　金：江西省气象局重点项目(JX2021Z08,JX2023Z11);江西省气象局面上项目(JX2023M20)。

摘　　要：利用常规高空、地面观测和雷达资料,基于高分辨的中尺度数值模式对2019年3月21日江西中北部一次对流天气过程形成的天气背景、环境条件及强对流持续加强的原因进行分析。结果表明,此次过程受高空冷涡低槽引导的冷空气、中低层切变与西南暖湿气流共同影响;强垂直风切变的存在,适宜的0℃和-20℃层高度及“上干下湿”的层结是形成冰雹和大风的有利环境条件。江西中北部近地面中尺度辐合线的长时间维持,与飑线及非飑线上的多单体雷暴群在江西境内的维持密不可分。模式能基本再现降水落区及飑线的结构,模拟的飑线前部辐合上升明显,有利于强回波的发展。Based on conventional high-altitudeobservation data,ground observation data and radar data as well as high-resolution Weather Research and Forecastnumerical model(WRF)output data,this study analyzesthe synopticbackground,atmosphericconditions and the causes of the strong convection sustained intensification of aconvective weather occurred on March 21,2019 in central and northern Jiangxi.Result shows that this convection process was caused by the cold air guided by the upper cold vortex trough,combined withlow-middle level shear and the southwest low level jet.The optimalconditions that led to the convective weather with hail and wind gust on the ground includingstrong vertical wind shear,the existence of suitable0℃and-20℃height and conditions as dryer on higher layer and wetter on lower layerstratification.The advantage of long-time existence of surface mesoscale convergence lines in the central and northern Jiangxi promoted the enhancement of squall line and other multi-cell storms.TheWRF numerical model couldsimulatethe distribution of the precipitationand the structure of the squall line,with distinct convergence and uplift ahead of the squall line,facilitating the development of strong echoes.

关 键 词：强对流 冰雹 中尺度辐合线 数值模拟 

分 类 号：P458[天文地球—大气科学及气象学]