摘要
为了细致地了解郑州极端暴雨的雷达回波特征与内部动力特征间的联系,利用地面自动站、探空、欧洲中期再分析资料以及双偏振雷达,分析了中尺度对流系统发展和成熟阶段的回波和雷达反演的风场结构,揭示了对流系统内粒子相态特征,动力特征等宏微观特征。主要研究结果如下:反射率因子特征为南北向的带状区域逐渐汇集为团状;径向速度特征为低层辐合和风向随高度顺转的强垂直风切变;基于雷达偏振量的分析,给出了对流系统局部结构,进一步的研究表明:差分反射率狭窄的强弧状区域可有效地指示对流系统内的强上升运动,其为极端降水系统的持续性发展提供了动力强迫;剖面上差分反射率柱与差分相位常数柱在空间分布上呈现出分离现象,两者体现出对流系统内的强上升运动,为暴雨的发展与增强提供了强有力的支持。
In order to understand in detail the relationship between radar echo characteristics and internal dynamic features of extreme rainfall in Zhengzhou,the wind field structure of the echo and radar inversion during the development and maturity of the mesoscale convective system was analyzed by using the ground automatic station,sounding data,European mid-term reanalysis data and dual polarization radar,and the macro and micro characteristics of particle phase and dynamic characteristics were revealed.The main research findings of this study are as follows:the reflectivity features show that the band-shaped regions oriented from north to south gradually converge into cluster formations.The radial velocity features indicate low-level convergence and a strong vertical wind shear with wind direction turning clockwise with height.Based on the analysis of polarimetric parameters,the study provides insights into the local structures within the convective systems.Further research reveals that the narrow and intense arc-shaped regions of differential reflectivity effectively indicate strong upward motion within the convective systems,providing dynamic forcing for the sustained development of extreme precipitation systems.In the vertical profiles,the distribution of the differential reflectivity columns and specific differential phase columns exhibits a separation phenomenon in spatial distribution.Both parameters reflect strong upward motion within the convective systems,providing strong support for the development and intensification of heavy rainfall.
作者
李建阳
平凡
LI Jian-yang;PING Fan(School of Remote Sensing&Geomatics Engineering,Nanjing University of Information Science&Technology,Nanjing 210044,China;Key laboratory of Cloud-Precipitation Physics and Severe Storms,Chinese Academy of Sciences,Beijing 100029,China)
出处
《科学技术与工程》
北大核心
2024年第1期113-124,共12页
Science Technology and Engineering
基金
国家重点研发计划(2018YFC1506801)
河北省技术创新引导计划(19975414D)。
关键词
极端暴雨
偏振参量
风场
相态分布
extreme rainstorm
polarization parameter
wind field
phase distribution
