台风? 云娜?(2004)的数值模拟:眼墙对流与环境风切变的关系 *

南京大学学报(自然科学版) ›› 2010, Vol. 46 ›› Issue (3): 317–327.

台风? 云娜?(2004)的数值模拟:眼墙对流与环境风切变的关系 *

聂高臻, 谈哲敏** , 仇欣

出版日期:2015-03-30 发布日期:2015-03-30
作者简介: ( 南京大学大气科学学院中尺度害性天气教育部重点实验室, 南京, 210093)
基金资助:
国家重点基础研究发展规划项目( 2009CB4251500) , 国家自然科学基金( 40828005, 40921160382) , 国家科技支撑
计划重点项目( 2006BAC02B03) , 国家公益行业科研专项( GYHY200706020)

A numerical simulation of typhoon Rananim (2004): The relationship between eyewall convection and the environmental vertical wind shear

Nie Gao -Zhen, T an Zhe -Min, Qiu Xin

Online:2015-03-30 Published:2015-03-30
About author:(Key Laboratory of Mesoscale Severe Weather of Ministry of Education, and School of Atmospheric Sciences,
Nanjing University, Nanjing, 210093, China)

摘要/Abstract

摘要： 本文利用中尺度数值模式 WRF, 模拟了台风云娜( 2004) 在近海加强并登陆的过程. 模拟的台风强度、路径、登陆时间和台风登陆前眼墙回波、水平风场的非对称性特征, 以及登陆时台风眼墙的回
波结构与实际观测结果相近. 台风中不同高度的环境风切变方向有较大差异: 登陆前风切变在低层指向西北, 中层指向东北, 高层指向东南. 涡旋中心倾斜主要受风切变影响; 同时眼墙对流发展与风切变方向
有着较好的对应关系, 而与涡旋倾斜的一致性较差. 登陆前后, 不同高度的环境风切变方向指向相应高度上的上升运动中心. 地形敏感性试验表明地形高度对环境风切变的影响较小, 而对台风涡旋倾斜有较大影响.

Abstract: In this study, the Weather Research and Forecasting model (WRF) is used to simulate the intensification and landfall of typhoon Rananim ( 2004). The simulated storm agrees well with observations in terms of track,
intensity and the time of landfall. Comparison between simulation and available radar/satellite observations, it is found that the simulation also successfully captured the asymmetric structures in the radar echo and surface wind
field, and especially the eyewall echo structure during Rananim s landfall. The simulation shows that the directions of environmental vertical wind shear vary remarkably with height. Before its landing, the vertical shear vector in the
lower level is northwestward; while in the middle level, the shear vector is northeastward and southeastward in theupper level. T he corresponding vortex tilt is mainly governed by vertical wind shear. Generation of convection is not
signifieantly affected by vortex tilt but agrees well with the direction of vertical shear. Before and after landing, the vertical shear vectors point directly to the updraft center of eyewall in different levels. Sensitivity experiment
suggests that variation of terrain height would make more difference on vortex tilt than on vertical wind shear.

聂高臻, 谈哲敏** , 仇欣 . 台风? 云娜?(2004)的数值模拟:眼墙对流与环境风切变的关系 *

[J]. 南京大学学报(自然科学版), 2010, 46(3): 317–327.

Nie Gao -Zhen, T an Zhe -Min, Qiu Xin
. A numerical simulation of typhoon Rananim (2004): The relationship between eyewall convection and the environmental vertical wind shear[J]. Journal of Nanjing University(Natural Sciences), 2010, 46(3): 317–327.

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