Development of Asymmetric Convection in a Tropical Cyclone under Environmental Uniform Flow and Vertical Wind Shear

作     者：Yubin LI Yuncong JIANG Johnny C.L.CHAN Kevin K.W.CHEUNG Yubin LI;Yuncong JIANG;Johnny C.L.CHAN;Kevin K.W.CHEUNG

作者机构：School of Atmospheric PhysicsNanjing University of Information Science&TechnologyNanjing 210044China Asia-Pacific Typhoon Collaborative Research CenterShanghai 201306China School of Energy and EnvironmentCity University of Hong KongHong Kong 999077China School of Emergency ManagementNanjing University of Information Science&TechnologyNanjing 210044China 

出 版 物：《Advances in Atmospheric Sciences》 (大气科学进展（英文版）)

年 卷 期：2024年第41卷第12期

页      面：2399-2418页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学] 

基　　金：supported by the National Natural Science Foundation of China(Grant number 42075072) support from The Startup Foundation for Introducing Talent of the Nanjing University of Information Science and Technology 

主　　题：tropical cyclone environmental flow vertical wind shear asymmetric convection inner core outer rainband 

摘      要：Idealized numerical simulations have been carried out to reveal the complexity in the development of asymmetric convection in a tropical cyclone(TC)under the influence of an environment with either uniform flow,vertical wind shear(VWS),or *** show that rainwater is enhanced to the right of the motion in the outer rainband,but such enhancement occurs in the upshear-left area of the inner-core ***,due to the asymmetries introduced by environmental flow,wavenumber-1 temperature and height anomalies develop at a radius of~1000 km in the upper levels.A sub-vortex aside from the TC center encompassing the wavenumber-1 warm center appears,and asymmetric horizontal winds emerge,which,in turn,changes the storm-scale(within 400 km)*** convection in the inner core closely follows the changing storm-scale VWS when its magnitude is larger than 2 m s^(-1) and is located downshear of the storm-scale VWS in all the experiments with environmental *** the outer rainbands,the maximum boundary layer convergence is mainly controlled by the direction of motion and is located in the rear-right *** results extend upon the findings of previous studies in three aspects:(1)The discovery of the roughly linear combination effect from the uniform flow and large-scale VWS;(2)The development of upper-level asymmetric winds on a 1000-km scale through the interaction between the TC vortex and environmental flow,resulting in changes in the storm-scale VWS pattern within the TC area;(3)The revelation that TC asymmetric convection closely aligns with the direction-varying storm-scale VWS instead of the initially designated VWS.