“0612”高邮龙卷母体风暴演变特征分析及龙卷形成机理初探  

ANALYSIS OF EVOLUTION OF PARENT STORMS AND ITS IMPACT ON GENESIS OF“0612”GAOYOU TORNADO

作　　者：唐佳佳 唐晓文 徐芬 张福贵[1,2] 李峰[4] TANG Jiajia;TANG Xiaowen;XU Fen;ZHANG Fugui;LI Feng(Chengdu University of Information Technology,Chengdu 610225,China;CMA Key Laboratory of Atmospheric Sounding,Chengdu 610225,China;Nanjing Joint Institute for Atmospheric Sciences,Nanjing 210000,China;CMA Meteorological Observation Center,Beijing 100081,China)

机构地区：[1]成都信息工程大学,四川成都610225 [2]中国气象局大气探测重点开放实验室,四川成都610225 [3]南京气象科技创新研究院,江苏南京210000 [4]中国气象局气象探测中心,北京100081

出　　处：《热带气象学报》2021年第5期824-835,共12页Journal of Tropical Meteorology

基　　金：国家重点研发计划项目(2018YFC1506103、2018YFC1506100);江苏省社会发展项目(BE2017776)共同资助。

摘　　要：利用多普勒天气雷达和探空站等高分辨率多源观测资料,分析了多尺度母体风暴演变特征及其相互作用对2020年6月12日形成于江苏高邮地区的一次龙卷天气过程的影响。此次龙卷过程形成于有利的大尺度环境,龙卷母体风暴由中β尺度的飑线和中γ尺度的超级单体两个不同尺度的对流系统组成。中γ尺度超级单体形成于中β尺度飑线的前侧,形成之后一直维持缓慢增强的趋势。在中β尺度飑线发展成熟并形成显著的弓状回波之后,超级单体的中气旋开始迅速增强。单雷达和多雷达风场反演结果表明,与中β尺度飑线相关的中尺度切变线和对流尺度切变区增强了中γ尺度超级单体附近的垂直涡度,促使中γ尺度超级单体快速增强。快速增强的超级单体最终导致本次龙卷过程的发生。In this paper,the evolution of parent storms and its impact on the genesis of a tornado that occurred in Gaoyou,Jiangsu Province on June 12,2020 were analyzed using data from high-resolution radar and sounding observations.The tornado formed in a favorable large-scale environment as the result of interactions between a meso-β squall line and a meso-γ supercell.The meso-γ supercell formed in front of the meso-β squall line and slowly intensified after its formation.As the meso-β squall line entered its mature stage with the formation of a well-organized bow echo,the mesocyclone associated with the mesoγsupercell began to rapidly intensify.The analysis of wind fields indicated that the meso-scale shear line and the horizontal shear associated with the meso-β scale squall line enhanced the vertical vorticity near the meso-γ scale supercell,which promoted the intensification of the meso-γ scale supercell.The intensified supercell finally led to the occurrence of this tornado.

关 键 词：龙卷涡旋 飑线 弓状回波 超级单体 水平风切变 

分 类 号：P445.1[天文地球—大气科学及气象学]