2020年凉山州秋季异常连阴雨分析  

Analysis of Abnormal Continuous Rain in Autumn in Liangshan Prefecture in 2020

作　　者：吕俊杰 牟端霞 LYU Junjie;MOU Duanxia(Liangshan Meteorological Bureau,Xichang 615000,China;Meigu Meteorological Bureau,Meigu 616450,China)

机构地区：[1]四川省凉山州气象局,西昌615000 [2]四川省美姑县气象局,西昌616450

出　　处：《高原山地气象研究》2022年第S01期76-81,共6页Plateau and Mountain Meteorology Research

摘　　要：利用NECP再分析资料和地面降水资料,对凉山州2020年9月10~17日连阴雨过程进行诊断分析。结果表明:此次连阴雨过程从低层到高层影响系统稳定;孟加拉湾的西南气流带来持续的水汽输送和能量补充,同时强降水区也有明显的水汽辐合中心;中层显著的上升运动为强降水的发生提供了持久的动力支持;低层持续的冷平流为冷暖气流的交汇提供了有利的条件,冷暖气团交汇的能量锋区对于降水强弱分界有很好的指示意义。Using NECP reanalysis data and ground precipitation data,the continuous rain processes in Liangshan Prefecture from September 10 to 17,2020 were diagnosed and analyzed.The results show that the continuous rain process affects the stability of the sys-tem from low to high levels.The southwesterly flow in the Bay of Bengal brings continuous water vapor and energy,and there are obvi-ous water vapor convergence centers in the heavy rainfall area.The obvious upward movement in the middle layer provides lasting dynamic support for the occurrence of heavy rainfall.The continuous low-level cold advection provides favorable conditions for the intersec-tion of cold and warm airflow,and the energy front area of the intersection of cold and warm air masses has a good indication for the de-marcation of precipitation intensity.

关 键 词：秋季连阴雨 暴雨 水汽 垂直运动 温度平流 

分 类 号：P445[天文地球—大气科学及气象学]