凉山州一次切变线暴雨特征及湿位涡分析  

Analysis on Characteristics and Moist Potential Vorticity of A Shear Line Rainstorm in Liangshan Prefecture

作　　者：边茜 BIAN Qian(Liangshan Prefecture Meteorological Bureau,Xichang,615000,China)

机构地区：[1]四川省凉山州气象局,西昌615000

出　　处：《高原山地气象研究》2022年第S01期54-59,共6页Plateau and Mountain Meteorology Research

摘　　要：利用NCEP1°×1°6h再分析资料、卫星云图及常规观测资料,对2020年6月29~30日凉山州一次切变线暴雨天气过程进行分析。结果表明:高原槽及低层切变线是此次暴雨的主要影响系统,南亚高压的高层辐散,有利于暴雨的触发和维持。明显的水汽输送及辐合、高能高湿的不稳定层结及强烈的垂直上升运动为暴雨提供了有利的条件。对流层高层MPV1>0且中低层MPV1<0、中低层MPV1>0且MPV2<0的配置有利于暴雨的发生。三个中尺度对流云团发展合并形成的MCC是此次暴雨的直接触发系统,强降雨常出现在TBB低值区及梯度大值区。Based on NCEP 1°×1°6h reanalysis data,satellite cloud image data and conventional observation data,a shear line rain-storm occurred in Liangshan Prefecture from June 29 to 30,2020 is analyzed.The results show that the plateau trough and the low-level shear line are the main influence systems of the rainstorm weather,the high-level divergence of the South Asia high is conducive to the triggering and maintenance of the rainstorm.The obvious water vapor transport and convergence,unstable stratification with high-energy and high humidity,and the strong vertical upward movement provide favorable conditions for the occurrence of the rainstorm.The config-uration of MPV1>0 in the upper troposphere,MPV1<0 in the middle and lower troposphere,MPV1>0 in the middle and lower tropo-sphere and MPV2<0 is beneficial to the occurrence of rainstorm.MCC formed by the development and combination of three mesoscale convective clouds is the direct influence system of the rainstorm process,and heavy rainfall often occurs in the low value area of TBB and the high value area of gradient.

关 键 词：暴雨 切变线 湿位涡 MCC 

分 类 号：P445[天文地球—大气科学及气象学]