湖北省三峡谷地两类突发性中尺度暴雨特征对比分析  

Comparative Analysis of Two Kinds of Sudden Mesoscale Rainstorms in Sanxia Valley of Hubei Province

作　　者：张萍萍[1] 韦惠红[1] 董良鹏[1] 张蒙蒙[1] 陈赛男[1] 张宁[2] Zhang Pingping;Wei Huihong;Dong Langpeng;Zhang Mengmeng;Chen Sainan;Zhang Ning(Wuhan Central Meteorological Observatory,Wuhan 430074,China;Science and Technology Department of Hubei Meteorological Bureau,Wuhan 430074,China)

机构地区：[1]武汉中心气象台,武汉430074 [2]湖北省气象局科技与预报处,武汉430074

出　　处：《气象与环境科学》2018年第3期64-70,共7页Meteorological and Environmental Sciences

基　　金：湖北省气象局科技基金重点项目(2017Z02)资助

摘　　要：利用湖北省加密自动站资料、常规观测资料、逐6 h的NCEP/GFS再分析资料及FY-2E红外卫星云图等资料,对三峡谷地南北汇合型及聚集增强型两类突发性中尺度暴雨进行了对比分析,得出如下结论:1)南北汇合型以天气尺度强迫为主,低层冷暖切变结合提供了主要的动力抬升机制,地面气流汇合及Ω型温度场的形成促使中尺度对流系统南北汇合增强,并受地形影响,沿峡谷向东移动。2)聚集增强型以边界层辐合和地形强迫抬升为主,边界层弱切变和地面形成的有组织的涡旋结构促使中尺度对流系统的产生发展,地面温度锋区的形成进一步促使零散分布的对流系统产生聚集增强,并由南向北移动。基于以上分析,建立了三峡谷地两类突发性中尺度暴雨概念模型。Based on intensified automatic observatory information,conventional observation data,6 hourly NCEP/GFS reanalysis data and FY 2E infrared satellite images,two kinds of sudden mesoscale rainstorms namely confluence type of north and south as well as aggregated enhancement type are comparative analyzed. The results are as follows. 1）The confluence type of north and south is dominated by synoptic scale, the combination of low layer cold and warm shear provides the main dynamic uplift mechanism,the ground flow confluence and the formation of the temperature field of Ω type increase the convergence of mesoscale convective systems in the north and south,which always move to eastward along the valley affected by the terrain.2）The aggregated enhancement type is dominated by boundary layer convergence and topographic forced uplift,weak shear on boundary layer and organized vortex structure formed on the ground promote the development of mesoscale convective systems, the formation of surface temperature front further promote the aggregation enhancement of scattered distributed convection systems, which move from south to north. Finally,concept model of the two kinds of sudden mesoscale rainstorms in Sanxia valley is built based on the above research.

关 键 词：三峡谷地 中尺度暴雨 地形增幅 概念模型 

分 类 号：P458.121.1[天文地球—大气科学及气象学]