“温比亚”引发3次龙卷的环境特征分析  

ANALYSIS OF ENVIRONMENTAL CHARACTERISTICS OF THE THREE TORNADOES CAUSED BY TYPHOON RUMBIA(2018)

作　　者：赵海军 潘玲 曹张驰 王庆华 ZHAO Haijun;PAN Ling;CAO Zhangchi;WANG Qinghua(Shandong Key Laboratory of Meteorological Disaster Prevention and Reduction,Jinan 250031,China;Linyi Meteorological Bureau,Linyi 276004,China;Rizhao Meteorological Bureau,Rizhao 276800,China)

机构地区：[1]山东省气象防灾减灾重点实验室,山东济南250031 [2]临沂市气象局,山东临沂276004 [3]日照市气象局,山东日照276800

出　　处：《热带气象学报》2021年第5期748-758,共11页Journal of Tropical Meteorology

基　　金：国家自然科学基金重点项目(91937301);山东省气象局重点项目(2017sdqxz09);山东省气象局预报员专项项目(SDYBY2017-14);山东省气象局预报员专项项目(SDYBY2018-13)共同资助。

摘　　要：利用常规观测资料及ERA5再分析资料,对2018年第18号台风“温比亚”登陆后造成3次龙卷过程的环境特征进行分析,结果指出:三次龙卷事件发生于傍晚时刻的台风中心东北象限200~300km处;低抬升凝结高度、强低层垂直风切变、中等偏弱的对流有效位能和强的风暴相对螺旋度环境有利于中气旋龙卷的发生;龙卷发生前2~3h为对流有效位能和能量螺旋度指数峰值阶段,发生前1~2h对流有效位能迅速下降;龙卷的发生与台风东北象限风暴相对螺旋度≥200m^(2)/s^(2)和低层垂直风切变≥13×10^(-3)s^(-1)叠置区内的地面中小尺度系统相关。Based on conventional observation data and ERA5 reanalysis data,the present study analyzed the environmental characteristics of the three tornadoes caused by Typhoon Rumbia(2018).The results are as follows:tornadoes occurred in the early evening,200~300 km away from the center of the typhoon and in the northeastern quadrant of the typhoon.Low lifting condensation level,strong low-level vertical wind shear,moderately weak convective available potential energy and strong storm relative helicity were conducive to the occurrence of mesocyclone tornado.The convective available potential energy and energy helicity index peaked 2~3 hours before the tornado occurred,and the convective available potential energy dropped rapidly 1~2 hours before the occurrence.Tornado occurrence was related to the meso microscale systems in the overlapping area of storm relative helicity(≥200 m^(2)/s^(2))and low-level vertical wind shear(≥13×10^(-3) s^(-1)).

关 键 词：台风 龙卷 垂直风切变 风暴相对螺旋度 能量螺旋度指数 

分 类 号：P458.2[天文地球—大气科学及气象学]