凉山州两次强降水天气过程特征对比分析  

Comparative Analysis of the Characteristics of Two Heavy Rainfall Weather Processes in Liangshan

作　　者：姜艳 侯砚 JIANG Yan;HOU Yan(Liangshan Meteorological Service,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》2023年第S01期37-44,共8页Plateau and Mountain Meteorology Research

摘　　要：利用水平分辨率1°×1°的NCEP6h再分析、新型监测和常规观测等资料,对2022年6月下旬的两次区域性强降水过程进行对比分析。结果表明:两次过程雨带均为自东北向西南移动,大雨及以上落区集中在凉山东部、北部、中部地区,200hPa高层辐散产生“抽吸作用”,500hPa、700hPa高原低槽东南移,地面辐合线触发对流发生;“6.23”过程满足低层暖平流强迫类强对流天气类型,“6.27”过程符合斜压锋生类强对流天气的基本特征;并且,低、中、高层影响系统的位置、强度和移动路径配合,降水区域上空的不稳定层结突出和水汽输送畅通,以及过程中有冷空气补充、干区侵入或逆温层的阻挡等参与,是凉山州强对流天气的主要影响因素。Using NCEP 6h reanalysis data with horizontal resolution of 10×1,new monitoring data and conventional observation data,two regional heavy rainfall processes in late June 2022 were compared and analyzed.It is found that the two processes both moved from northeast to southwest.The falling areas of heavy rain and above were concentrated in the east,north and central regions.The upperlevel divergence at 200 hPa produced"suction effect",and the plateau troughs at 500 hPa and 700 hPa moved southeastward,and the surface convergence line triggered convection."6.23"met the type of strong convective weather of low-level warm advection forcing,and"6.27"met the basic characteristics of strong convective weather of baroclinic frontogenesis.The common influencing factors of strong convective weather in Liangshan Yi Autonomous Prefecture are as follows:the location,intensity and moving path of the low,middle and high level influence systems,the unstable stratification over the precipitation area and the smooth water vapor transport,as well as the participation of cold air supplement,dry area intrusion or temperature inversion layer.

关 键 词：中尺度分析 MCC 强对流 低层暖平流强迫 斜压锋生 

分 类 号：P458.121[天文地球—大气科学及气象学]