一次飑线过程多普勒天气雷达资料分析  

Analysis of a Squall Line Process with Doppler Weather Radar Data

作　　者：姜勇强 韩锐 姜明波 周育锋 陈超辉 王华文 JIANG Yong-qiang;HAN Rui;JIANG Ming-bo(College of Meteorology and Oceanography,National University of Defense Technology,Nanjing,Jiangsu 211101;Army 93117 of PLA,Nanjing,Jiangsu 210018;Army 61540 of PLA,Beijing 100029)

机构地区：[1]国防科技大学气象海洋学院,江苏南京211101 [2]93117部队,江苏南京210018 [3]61540部队,北京100029 [4]61741部队,北京100094

出　　处：《安徽农业科学》2020年第1期222-226,共5页Journal of Anhui Agricultural Sciences

基　　金：国家自然科学基金项目(41975128,41275099,41205073,41275012)

摘　　要：利用江苏省多部S波段多普勒天气雷达资料,对2012年5月16日江苏北部的一次飑线过程进行分析。结果表明,飑线发生前500 hPa东北冷涡南侧高空槽迅速南压,江苏北部槽后强冷平流与低空暖平流形成强烈的位势不稳定层结。飑线发生、发展直至消亡过程中共出现2条带状回波,一条是从徐州附近开始发展,另一条则是在连云港附近的海上开始发展,随后2条飑线合并而强烈发展。飑线中的强回波具有明显的超级单体风暴特征,存在悬挂回波和穹隆。径向速度分析表明,中层存在深厚的中尺度涡旋对,双涡之间可以吸入更多的空气,能有效地维持风暴内部的高速上升气流,使风暴能得到维持而不受环境风的干扰。垂直累积液态含水量(VIL)在连云港西南部160 km处冰雹发生时,由16日15:35的47.2 kg/m^2跃增至15:41的98.8 kg/m^2;而当VIL由62.5 kg/m^2剧减至10.2 kg/m^2时,连云港西南部约53 km处出现了大风,表明VIL的剧烈变化对冰雹和大风的发生具有指示作用。Using S-band Doppler weather radar data of Jiangsu Province,a squall line process in northern Jiangsu Province on May 16,2012 was analyzed.The results showed that the 500 hPa trough to the south of the northeast cold vortex rapidly moved southward before the squall line occurred,and the strong cold advection behind the trough in northern Jiangsu formed a strong potential instability stratification with the low-level warm advection.During the occurrence,development and extinction of the squall line,two band echoes appeared.One began to develop near Xuzhou,the other began to develop in the sea near Lianyungang,and then the two squall lines merged and developed strongly.The strong echoes in squall line had obvious supercell storm characteristics,and there were suspended echo and vault.Radial velocity analysis shows that there was a mesoscale vortex couple in the middle layer,and more air could be inhaled between the two vortices,which could effectively maintain the high-speed updraft in the storm,so that the storm could be maintained without the interference of environmental wind.Vertically integrated liquid(VIL)quickly increased from 47.2 kg/m^2 at 15:35 to 98.8 kg/m^2 at 15:41 when hail occurred about 160 km to southwest of Lianyungang.When VIL was dramatically reduced from 62.5 kg/m^2 to 10.2 kg/m^2,strong winds appeared about 53 km to the southwest of Lianyungang,indicating that the drastic changes of VIL could indicate the occurrence of hail and gale.

关 键 词：飑线 组合反射率因子 径向速度 涡旋对 垂直累积液态含水量 

分 类 号：P458.121[天文地球—大气科学及气象学]