热带气象学报2023，Vol.39Issue(5)：742-750,9.DOI:10.16032/j.issn.1004-4965.2023.064
海南岛一次强飑线系统演变的双偏振特征分析
DUAL-POLARIZATION CHARACTERISTICS OF A STRONG SQUALL LINE EVOLUTION IN HAINAN ISLAND
摘要
Abstract
A long-lived squall line system caused strong winds and heavy rainfall in the central and northern parts of Hainan Island on April 22,2020.The present study analyzed the evolution of the squall line system by comparing conventional meteorological data with dual-polarization radar detection data.The results indicated that the squall line occurred on the northwestern edge of the subtropical high-pressure zone,with a quasi-stationary front controlling the ground.Mainly affected by the warm and humid southwest airflow,the intensity of cold air was generally weak.The ground convergence line and suitable thermal conditions acted as environmental triggers.Throughout the evolution of the squall line,the radar combined reflectivity consistently maintained a strong value with large areas exceeding 55 dBZ.However,the differential reflectance(ZDR)of the cloud system exhibited a large area exceeding 5 dB and extended up to 8-9 km vertically during the initial formation of the squall line(16:20-16:43).During the squall line process,the ZDR over Haikou and Wenchang stations peaked approximately 12 minutes before ground precipitation and decreased as precipitation increased.The KDP was closely correlated with precipitation intensity.Additionally,the frequency of ground lightning increased in the early stage of precipitation,peaking approximately 6 to 12 minutes before ZDR and about 24 to 48 minutes before KDP.关键词
飑线系统/海南岛/上升气流/双偏振雷达Key words
squall line/Hainan Island/updraft/dual-polarization radar分类
大气科学引用本文复制引用
邢峰华,黄彦彬,李光伟,敖杰,李思腾..海南岛一次强飑线系统演变的双偏振特征分析[J].热带气象学报,2023,39(5):742-750,9.基金项目
珠江流域(华南区域)气象科研开放基金项目(ZJLY202308) （华南区域）
海南省自然科学基金项目(421QN372)共同资助 （421QN372）
