2020年08号台风特征分析

Characteristic Analysis of Typhoon No. 08, 2020

为研究2020年08号台风“巴威”发生期间的降水及结构等特征,选用2020年8月14~30日的台风资料、ECMWF (European Centre for Medium-Range Weather Forecasts)提供的0.25˚ ×0.25˚的ERA5再分析资料以及英国气象局哈德莱中心提供的海温资料,对台风登陆前后的环流形势、海温与垂直风切变的特征、降水时空分布及水汽通量散度特征、以及台风的动力场进行分析。结果表明:1) “巴威”自生成以来路径较稳定、2008号台风“巴威”具有生命史长,强度大,发展快,影响时间长,降雨强度大的特点。2) 台风登陆前后的降水在环流形势上的表现很好,并且水汽通量散度上也有良好的表现,有大量充沛而连续的水汽从沿海一带向北方输送,低层有着比较大的水汽通量辐合。3) 台风“巴威”在其强度急剧加强的过程之中,台风的中心周围低层维持着辐合,高层则维持辐散,这种情况是非常有利于对流的发展,并且还为暴雨的产生提供了有利的动力条件。

In order to study the characteristics of precipitation and structures during the occurrence of Typhoon “Baweishan” in 2020, using typhoon data from August 14~30, 2020, ERA5 re-analyzed by ERA5 provided by ECMWF (European Centre for Medium-Range Weather Forecasts) and the British Meteorological Bureau, the sea temperature data provided by Hadley Center has the characteristics of the typhoon login, the characteristics of the sea temperature and the vertical wind turbine, the precipitation time and space distribution, and the water vapor flux feature, and the power field of the typhoon. The results showed that: 1) “Baweishan” has been more stable since the generation, the “Baweishan” has the history of life, the strength, fast development, long influence, and high rainfall intensity. 2) The precipitation before and after the typhoon landing is very good in the circulation situation, and there is also a good performance in the water vapor flux, there is a lot of energetic and continuous water vapor to transport from the coastal, and the low-rise has a relatively large water vapor pass. 3) Typhoon “Baweisan” is in the process of strongly strengthening its strength, the low-level high-rise in the center of the typhoon, the high-rise is maintained, which is very conducive to convection development, and provides favorable dynamic conditions for the generation of heavy rain.