摘要
利用FNL再分析资料和地面加密观测资料,对2018年8月18—19日温比亚台风造成河南东部极端暴雨进行诊断分析。结果表明,温比亚在河南东部移动缓慢,是由于河南高空受高压控制处于弱风区,引导气流小,低层在东、西和北3个方向受高压带三面包围等原因作用下造成的;温比亚台风登陆后,台风低压中心与K指数大值中心相吻合,在低压中心与K指数大值中心分离时,低压中心的后续移向则趋于向K指数大值中心方向移动;充足的水汽持续供应、高层辐散大于低层辐合造成地面减压、气旋性涡度的持续以及合适的垂直风切变是温比亚台风强度维持的重要原因。
FNL reanalysis data and ground encrypted observation data were used to diagnosis and analysis of extreme rainstorm in eastern Henan caused by typhoon Wenbia from August 18 to 19,2018.The results showed that Wenbia moved slowly in the east of Henan province,it′s because the altitude of Henan was controlled by high pressure and was located in the weak wind area,with small guiding air flow,the lower layer was surrounded by the high pressure belt in the east,west and north.After Wenbia landed,the center of typhoon low pressure coincided with the center of K index,when the center of low pressure was separated from the center of high value of K index,the following direction of low pressure center tended to move towards the center of K index.Sufficient water vapor was continuously supplied,the high-level convergence was larger than the low-level convergence,resulting in ground decompression,the persistence of cyclonic vorticity,and the appropriate vertical wind shear was the important reason for maintaining the strength of Wenbia.
作者
王建新
张启绍
WANG Jian-xin;ZHANG Qi-shao(Anyang Meteorological Bureau,Anyang 455000,Henan,China)
出处
《湖北农业科学》
2020年第S01期319-326,共8页
Hubei Agricultural Sciences
关键词
温比亚台风
台风路径
暴雨
水汽通量
散度
typhoon Wenbia
typhoon path
rainstorm
water vapor flux
divergence
