Impacts of the Lowest Model Level Height on Tropical Cyclone Intensity and Structure

作     者：MA Zhanhong FEI Jianfang HUANG Xiaogang CHENG Xiaoping 

作者机构：College of Meteorology and Oceanography PLA University of Science and Technology 

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

年 卷 期：2014年第31卷第2期

页      面：421-434页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 08[工学] 0706[理学-大气科学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the National Public Benefit (Meteorology) Research Foundation of China (Grant No. GYHY201106004) the National Natural Science Foundation of China (Grant Nos. 41005029, 41105065 and 41230421) 

主　　题：tropical cyclone lowest model level simulation 

摘      要：Variable thicknesses in the lowest half-ηmodel level （LML） are often used in atmospheric models to compute surface diagnostic fields such as surface latent and sensible heat *** effects of the LML on simulated tropical cyclone （TC）evolution were investigated in this study using the Weather Research and Forecasting （WRF） *** results demonstrated notable influences of the LML on TC evolution when the LML was placed below 12 *** TC intensification rate decreased progressively with a lowering of the LML,but its ultimate intensity change was relatively *** maximum 10-m winds showed different behavior to minimum sea level pressure and azimuthally-averaged tangential winds,and thus the windpressure relationship was changed accordingly by varying the *** TC circulation was more contracted in association with a higher *** latent heat fluxes were enhanced greatly by elevating the LML,wherein the wind speed at the LML played a dominant *** changes in the wind speed at the LML were dependent not only on their profile differences,but also the different heights they were taken *** to the enhanced surface heat fluxes,more intense latent heat release occurred in the eyewall,which boosted the storm＇s intensification.A higher LML tended to produce a stronger storm,and therefore the surface friction was reinforced,which in turn induced stronger boundary layer inflow together with increased diabatic heating.