摘要
使用NCAR/NCEP再分析资料、国家气象中心提供的逐时热带气旋资料和淮安S波段多普勒雷达观测资料,分析了1710号台风"海棠"环流前部的一次龙卷过程。结果表明:此次龙卷过程由台风残留低压引发,环境分析显示淮安地区低层位于急流辐合区,高层500 hPa位于辐散区,有利于对流发展。雷达径向速度资料分析显示龙卷发生前后存在正负速度对涡旋形成和发展。底层强垂直风切变和垂直速度不均匀分布,有利于激发龙卷天气的发生或者促进龙卷天气的维持发展。
Based on the NCAR/NCEP reanalysis data and the hourly tropical cyclone data from National Meteorological Center of China Meteorological Administration and Doppler radar data in Huaian, the structures and evolutions of a tornado ahead of Typhoon Haitang were analyzed. The results showed that the system was caused by the residual low pressure of typhoon Haitang, and the convergence area of low level and divergence area of high-level jet of Huaian district was beneficial to the tornado development. Radar radial velocity data analysis showed that during the time before and after the tornado occurrence, the positive and negative rate was good at the formation and development of vortex. The strong vertical wind shear and vertical velocity distribution, was conducive to the occurrence of excitation tornado or promote sustainable development.
作者
史达伟
李超
韩桂荣
陈小宇
SHI Da-wei;LI Chao;HAN Gui-jun;CHEN Xiao-yu(Lianyungang Meteorological Bureau,Lianyungang 222002 China;Jiangsu Meteorological Observatory,Nanjing 210008 China)
出处
《海洋预报》
北大核心
2018年第5期53-59,共7页
Marine Forecasts
基金
江苏省自然科学基金青年基金(BK20171095)
连云港市科技支撑项目(SH1634)
中国气象局预报员专项(CMAYBY2017-026)
江苏省预报员专项(JSYBY201812)
