0601号台风登陆前后强度迅速减弱原因的诊断分析

Diagnostic Analysis of Reasons for Intensity Weakening Rapidly around Landfall of Typhoon No. 0601

本文利用美国国家环境预报中心(NCEP)资料,对0601号台风"珍珠"从强盛期到迅速减弱的成因进行分析。结果表明,台风中心西侧低层出现辐散,高层150～100 hPa出现辐合中心使台风低层辐合、高层辐散的结构破坏;台风前进方向海温的变冷、干冷平流的侵入使台风暖性结构破坏;以及大气柱可降水量减弱是导致台风"珍珠"登陆前后迅速减弱的主要原因。

In this paper,by using the NCEP daily reanalysis data,the causes for typhoon Chanchu (0601) suddenly weakening are examined.The results show that the main reasons for typhoon Chanchu weakening rapidly around landfall are that the divergence area appears in the west side of typhoon center at low levels and convergence center appears at 150—100 hPa,which makes the structure of divergence field destroyed. In addition,the temperature of the sea surface which the typhoon will pass over would decrease, the warm structure of typhoon is broken up due to the intrusion of dry and cold air advection,and precipitable water vapor of air column also decreases.