河北保定“7.9”致灾雷暴大风环境场与风暴特征  

Environmental Field and Storm Features of a Destructive Thunderstorm Gale in Baoding of Hebei Province on 9 July 2017

作　　者：马鸿青[1] 张江涛 李彦 徐义国[1] 董疆南 王亚婷 MA Hongqing;ZHANG Jiangtao;LI Yan;XU Yiguo;DONG Jiangnan;WANG Yating(Baoding Meteorological Bureau of Hebei Province,Baoding 071000,Hebei,China;Hebei Provincial Meteorological Bureau,Shijiazhuang 050000,China)

机构地区：[1]河北省保定市气象局,河北保定071000 [2]河北省气象局,河北石家庄050000

出　　处：《干旱气象》2019年第4期613-621,共9页Journal of Arid Meteorology

基　　金：市科技局课题(18ZG012)

摘　　要：利用常规观测资料、地面加密观测资料、雷达产品、卫星云图以及NCEP/NCAR逐日6h再分析资料,对2017年7月9日保定区域性雷暴大风的环境条件和风暴特征进行分析。结果表明:本次区域性雷暴大风过程发生在高空西北偏西气流中,强温度直减率、较强的低空垂直风切变、低层丰富能量的聚集是雷暴大风爆发的前提条件,地面冷锋、干侵入和地面中尺度辐合线为触发机制。地面冷锋前部分散的对流云团在地面中尺度辐合线附近合并为有组织的带状回波。第1阶段和第2阶段10级以上雷暴大风发生在雷暴云的成熟期,第1阶段雷暴大风的径向速度为中气旋型,中气旋首先在中层出现,之后分别向低空和高空伸展,随着中气旋底部高度降低到2.2km,雷暴大风发生;第2阶段雷暴大风的径向速度主要为低空(1.0km)雷暴云后侧强的入流气流造成的大风区型;第3阶段10级以上雷暴大风出现在雷暴云的消亡期,为雷暴云前侧强出流气流形成的雷暴大风。Based on conventional data,automatic weather stations observations,Doppler weather radar products,satellite image and NCEP/NCAR daily 6 h reanalysis data,the environmental conditions and storm features of a regional thunderstorm gale on July 9th 2017 were analyzed.The results show that the thunderstorm gale occourred under the influence of upper northwestern flow,the lower vertical wind shear,high temperature lapse rate and the accumulation of abundant energy in the lower layer were favorable for its occurrence.Ground cold front,dry intrusion and mesoscale convergence line were triggering mechanism.The organized band was composed by scattered convective clouds in front of the cold front along the surface mesoscale convergence line.At the first and the second stage,the gale with wind force scale greater than 10 occured at the mature stage of thunderstorm clouds,it was mesocyclone type in the first period,the mesocyclone appeared first in the middle layer,and then developed to the lower and higher layers,the thunderstorms broke out when the bottom of the mesocyclone dropped to 2.2 km.At the second stage,it was mainly the gale type caused by the strong inflow behind the thunderstorm cloud at low altitude(1.0 km).The gale with wind force scale greater than 10 at the third stage appeared in the extinction period of thunderstorm clouds,which was formed by strong outflow in front of thunderstorm clouds.

关 键 词：区域性雷暴大风 中尺度辐合线 干侵入 中气旋 大风区 

分 类 号：P458.123[天文地球—大气科学及气象学]