台风登陆前后暖心结构变化的探讨

Study on the lnvestigation of the Variation of the Warm Core Structures for Typhoons just before and after Landing on the Mainland of the China

根据NCEP再分析资料和台风年鉴资料,在2000～2007年期间登陆我国的台风中选取了18个台风为例,对这18个台风温度距平垂直剖面图进行分析。结果发现:在垂直结构上,台风登陆前台风暖心结构图形近似圆形或椭圆形,有规则,且圆滑;当台风登陆后暖心结构发生变化,图形呈不规则、扁平。台风登陆前后暖心面积指数大部分都呈减小趋势,极少数呈增大趋势。台风在登陆前暖中心温度距平值最大值达到最大,登陆后逐渐减少。最终结合18个台风登陆前后暖心面积指数衰减率和登陆点的分布,将登陆台风分为两大类:第一类是在浙江省的东南沿海、福建省的东北沿海(约119°E～122°E)以及广东省的中部偏东沿海(约115°E～116°E)登陆的台风;第二类是其它的地方登陆的台风。

Based on the NCEP reanalyzed data and the typhoon yearbook data,the eighteen typhoons,selected from the landing typhoons in the period from 2000～2007,are analyzed on their temperature anomaly profiles.The result shows that pre and post the typhoon landing,the warm core structure figures of the typhoon approximate round or oval,are well-regulated and smoothing,from the vertical structure;after the typhoon landing,the warm heart structure diagram changes,irregular and compressed.Pre and post typhoon landing,the warm heart area indexs decrease mostly,and the very few increase.Before the typhoon landing,the warm heart temperature＇s maximum value is maximum,and after the typhoon landing,decrease gradually.Lastly,based on the decreasing rate of the warm heart area indexs pre and post the eighteen typhoons and the typhoons landing positions’ distribution,the landing typhoons are divided into two categories：the first is the landing typhoon of the southeast coast of Zhejiang Province,the northeast coast of Fujian Province（about 119°E～122°E）and the middle coast of Guangdong Province（about 115°E～116°E）;the second is the landing typhoon of other places.