“0713”山西短时强降水天气的潜势及触发条件分析
投稿时间:2019-03-30  修订日期:2019-05-29  点此下载全文
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作者单位E-mail
马丽 山西省气象台 524942112@qq.com 
苗爱梅 山西省气象台  
董春卿 山西省气象台  
王思慜 山西省气象台  
董剑 五台山气象站  
王强 五台山气象站  
中文摘要:利用常规观测资料、NCEP1??1?再分析资料、FY-2G卫星逐时TBB资料、多普勒雷达和风廓线雷达及自动站资料,对2018年7月13日夜间出现在山西东南部的短时强降水天气进行了潜势及触发特征分析。结果表明:副高外围的强劲西南气流为本次短时强降水过程提供了充沛的水汽条件;“上干冷下暖湿”的层结结构与“高层冷平流、低层暖平流”的温度差动平流提供了强对流发生发展所需的能量条件;上升运动的形成和维持有利于不稳定能量的释放和增强。地面中-β尺度辐合线发展为中-β尺度涡旋,激发中-β尺度对流云团的合并与加强;≥35dBz的中-β尺度带状回波中镶嵌的中-γ尺度对流单体,在500hPa西南气流的引导下,形成“列车效应”是形成局地短历时强降水的直接原因。
中文关键词:短时强降水,潜势条件,触发机制
 
Analysis of the potential and triggering characteristics of short-term heavy precipitation in Shanxi on July 13,2018
Abstract:Using conventional observation data, NCEP1??1? reanalysis data, FY-2G satellite hourly TBB data, radar and automatic station data,the potential and triggering characteristics of short-term heavy precipitation in southeastern Shanxi on the night of July 13, 2018 were analyzed. The results show that the strong southwest airflow around the subtropical high provides abundant water vapor conditions for the short-term heavy precipitation process. The stratification structure of “dry and cold under warm and wet” and the temperature differential advection of “high-rise cold advection and low-level warm advection” provide the energy conditions required for the development of strong convection. The formation and maintenance of ascending motion is conducive to the release and enhancement of unstable energy. The meso-βscale convergence line on the ground develops into a meso-βscale vortex, stimulating the consolidation and strengthening of the mid-β scale convective cloud mass,which stimulates the merging and strengthening of meso-βscale convective clouds. The meso-γscale convective monomer embedded in the meso-βscale band echo of ≥35 dBz, under the guidance of the 500 hPa southwest airflow, forms a“train effect”,which was the direct cause of the formation of short-duration heavy rainfall. The short-term heavy precipitation is located between 5880 gpm and 5840 gpm on 500 hPa map, between 850 hPa and 700 hPa shear line, and overlaps with 850 hPa and 700 hPa wet tongue, ground trunk line and mesoscale convergence line (near 10 km range), cold air inflow side of convective cloud mass TBB gradient high value area and TBB ≤-60 ℃.
keywords:Short-term heavy rainfall  potential conditions  triggering mechanism
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