摘要
主要利用常规观测资料、EC、NCEP再分析资料、卫星云图、雷达回波等研究“威马逊”进入南海后,逐渐增强直至登陆海南岛后强度维持的原因。结果表明:副热带高压加强加剧了TC的非对称结构的发展,对TC强度演变产生了影响;充足的水汽输送是TC加强的重要条件,强盛的西南季风和越赤道气流是“威马逊”主要水汽输送带;低层强辐合和高空强辐散促使TC猛烈发展;垂直风切变小、高海温有利于TC强度加强;TC加强过程,云系不断紧密,台风眼越发清晰,且回波结构逐渐紧密、对称,眼区逐渐变圆,减小而清晰,眼壁清楚,眼区回波不断加强。
The reasons for the intensity maintenance of typhoon"Rammasun"after the typhoon entered into the South China Sea and gradually increased until landing on Hainan Island was analyzed by using conventional observation data,EC,NCEP reanalysis data,satellite cloud image and radar reflections.The results showed that the development of the asymmetric structure of tropical cyclone(TC)was intensified by the Subtropical High which had an impact on the evolution of the TC intensity.The adequate water vapor transport was an important condition for TC intensification,and the prevailing southwest monsoon and the airflow across the equator were the main vapor conveyor belts for typhoon"Rammasun".The low-level strong convergence and high-altitude strong divergence were favourable for the TC vigorous development.The vertical wind shear was small,and the high sea temperature was conducive to intensification of the TC.In the process of TC intensification the cloud system was constantly tight,the typhoon eye became clearer,and the echo structure was gradually compact and symmetrical.The eye gradually became round and then clearer,the eye wall was clear,and the echoes from the eye were continuously strengthened.
作者
陈燕
吴俞
王天巍
CHEN Yan;WU Yu;WANG Tianwei(Hainan Key Laboratory for South China Sea Meteorology and Disaster Mitigation,Haikou,Hainan 570203;Hainan Emergency Warning Information Release Center,Haikou,Hainan 570203;Hainan Meteorological Observatory,Haikou,Hainan 570203)
出处
《热带农业科学》
2020年第1期120-126,共7页
Chinese Journal of Tropical Agriculture
基金
海南省气象局技术提升项目(No.HNQXJS201613)
关键词
超强台风“威马逊”
近海加强
成因
super typhoon"Rammasun"
intensification in the coastal waters
cause
