大气科学2017，Vol.41Issue(5)：949-959,11.DOI:10.3878/j.issn.1006-9895.1703.16208
基于风廓线雷达的广东登陆台风边界层高度特征研究
A Study on Boundary Layer Height Characteristics of Landing Typhoons by Wind Profilers in Guangdong Province
摘要
Abstract
Based on eight tropical cyclones (TCs) landing in Guangdong Province,the boundary layer characteristics of tropical cyclones are analyzed using high spatial and temporal resolution wind profiler observations after data quality control.The results show that maximum tangential wind area exists in the tropical cyclone boundary layer.Larger vertical spans of the tangential winds,stronger tangential wind velocity,and longer duration of strong winds usually correspond to stronger and longer maintained tropical cyclone intensity.Radial inflow characteristic of landing TCs are different from each other.Larger depth of radial inflow in the outer-core region often means stronger inflow speed and longer maintenance of the TC intensity.Since the vertical gradient of wind profiler SNR (signal to noise ratio) is a good indicator of atmospheric turbulence,TC boundary layer heights evaluated by the top of the radial inflow and by the vertical gradient of wind profiler SNR are quite consistent when the depth of the radial inflow is below 2000 m,but the difference becomes larger when the depth of radial inflow is thick.The boundary layer heights of different TCs are not the same.If the TC intensity weakens rapidly after landing,the boundary layer height is within 500-1000 m.If the TC intensity maintains in a relatively short period of a few hours,the boundary layer height is within the range of 1000-2000 m.If the TC intensity maintains for a long time,the boundary layer height is above 2000 m with the maximum up to 5000-7000 m.All these results are important for us to better understand the boundary layer characteristics of TCs after their landfall.关键词
热带气旋/边界层高度/风廓线雷达Key words
Tropical cyclones/Boundary layer height/Wind profiler分类
天文与地球科学引用本文复制引用
廖菲,邓华,李旭..基于风廓线雷达的广东登陆台风边界层高度特征研究[J].大气科学,2017,41(5):949-959,11.基金项目
国家自然科学基金项目 41305029,广东省科技计划项目 2013B020200013,广州市科技计划项目 201604020069,中国气象局关键技术集成与应用 CMAGJ2015M42 （）
National Natural Science Foundation of China (Grant 41305029),Science and Technology Planning Project of Guangdong Province (Grant 2013B020200013),Guangzhou Municipal Science and Technology Planning Project (Grant 201604020069),Meteorological Key Technology Integration and Application Projects of China Meteorological Administration (Grant CMAGJ2015M42) （Grant 41305029）
