气象与环境学报2025，Vol.41Issue(4)：58-67,10.DOI:10.3969/j.issn.1673-503X.2025.04.007
基于S波段和X波段雷达的浙江一次极端短时强降水特征分析
Characteristics of a short-duration extreme heavy rainfall in Zhejiang Province based on S-band and X-band radar
摘要
Abstract
Based on ERA5 reanalysis data,S-band dual-polarization radar and X-band dual-polarization phased ar-ray radar observation data,wind retrieval and lightning location data,the characteristics of local short-duration ex-treme heavy rainfall in Zhejiang on July 22,2023 were analyzed.Our results illustrate that:This event took place under the control of the subtropical high.The unstable stratification caused by the intrusion of cold dry air in the middle layer and the high energy and humidity in the lower layer provided the beneficial environment for the e-vent.The initial linear convection occurred near the surface convergence line.The structure of the mesoscale con-vective system experienced from the single linear convection to the Connected double linear convection then to the separation.The development of ZDR and KDP columns indicate the strengthening of the convective system.When heavy rainfall occurs,the large areas of ZH,ZDR and KDP decrease rapidly,and the variation of rainfall intensity is closely related to KDP.The frequencies of cloud flash and negative ground flash significantly increase during heavy rainfall periods.The configuration of inclined updrafts and downdrafts is conducive to the development and mainte-nance of convective systems.The encounter of downdraft and ambient wind is benefit for the backward-propaga-tion of convective system.Extreme heavy rainfall is also associated with the"train effect"and deep warm cloud layer.关键词
极端短时强降水/双偏振参量/相控阵雷达/风场反演/后向传播Key words
Short-duration extreme rainfall/Dual polarization parameter/Phased array radar/wind retrieval/Backward propagation分类
天文与地球科学引用本文复制引用
QIAN Zhuolei,ZHANG Chaoqin,SHEN Zhewen,ZHAO Chiyu..基于S波段和X波段雷达的浙江一次极端短时强降水特征分析[J].气象与环境学报,2025,41(4):58-67,10.基金项目
浙江省气象局重点项目(2021ZD28、2022ZD01)资助. （2021ZD28、2022ZD01）
