2021年5月10—11日樟树市降水过程分析  

Analysis of Precipitation Process in Zhangshu City from May 10 to 11,2021

作　　者：杨欣 YANG Xin(Zhangshu Meteorological Bureau,Zhangshu,Jiangxi 331200)

机构地区：[1]樟树市气象局,江西樟树331200

出　　处：《农业灾害研究》2021年第12期53-54,共2页Journal of Agricultural Catastrophology

摘　　要：利用地面自动站资料和micaps形势场、探空图等资料,分析了2021年5月10—11日樟树市降水过程。结果表明:第一阶段主要过程为10日16:00~18:00的冰雹强对流天气,该过程主要是由于584线北抬,冷暖空气江西北部交汇,在200 hPa存在分流区,700 hPa、850 hPa处都有反气旋的形成,地面辐合线在江西北部交汇,增强了大气的抽吸作用,从而促进江西北部上方大气的垂直上升运动,加上西南急流加强,为此次降水过程提供了大量的水汽输送,配合午后的升温,为大气垂直上升运动创造了良好的环境,导致冰雹强对流天气的发生;第二阶段是11日03:00~06:00的暴雨过程,也可分为2个部分,第一部分是由高空切变线南压过程中配合下层良好的水汽条件触发的强降水过程,第二部分是处于反气旋西南急流加强,配合高空切变线的末端的强烈风切变触发的强降水过程。再加上南昌探空图上K指数=50,CAPE=1187.8,SI指数=13.63,各项有利于对流的指数异常偏高,低空风切变为暖切,有利于垂直对流的发展,导致发生持续性强降水。The precipitation process of Camphor tree from May 10 to 11,2021was analyzed by using the data of ground automatic station,MICAPS situation field and sonde map.The results showed that:The main process of the first stage was the hailstorm from 16:00 to 18:00 on October 10.This process was mainly due to the fact that line 584 was raised northward,and cold and warm air converged in northern Jiangxi.There was a diverging area at 200 hPa,and anticyclone formed at 700 hPa and 850 hPa.In addition,the strengthening of southwest jet stream provided a large amount of water vapor transport for the precipitation process.With the warming in the afternoon,it created a good environment for the vertical upward movement of the atmosphere,resulting in the occurrence of hail strong convective weather.03:00 to surf in the second stage was May 11,the process of rainstorm also could be divided into two parts,the first part was the process with the lower shear line south high pressure good moisture conditions triggered by the heavy rain process,the second part was in the southwest jet strengthening anticyclone,with high shear line at the end of the strong wind shear triggered strong precipitation process.In addition,K index was 50,CAPE Value was 1187.8,SI index was 13.63 on the Sonde map of Nanchang,the indexes favorable to convection were abnormally high,and the low-level wind shear turns into warm shear,which was favorable to the development of vertical convection,leading to the occurrence of continuous heavy precipitation.

关 键 词：冰雹 切变线 西南急流耦合 

分 类 号：P412.25[天文地球—大气科学及气象学]