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Impacts of the lowest model level Height on Tropical Cyclone Intensity and Structure

Advances in Atmospheric Sciences 2014年第2期31卷 421-434页

作者： MA Zhanhong FEI Jianfang HUANG Xiaogang CHENG Xiaoping College of Meteorology and Oceanography PLA University of Science and Technology

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.

关键词： tropical cyclone lowest model level simulation

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