西北太平洋变性热带气旋的若干特征

南京大学学报(自然科学版) ›› 2010, Vol. 46 ›› Issue (3): 328–336.

西北太平洋变性热带气旋的若干特征

宋金杰 , 王　元

出版日期:2015-03-30 发布日期:2015-03-30
作者简介: ( 南京大学大气科学学院中尺度灾害性天气教育部重点实验室 , 南京 ,210093)
基金资助:
国家自然科学基金 ( 40830958 、 40730948 、 40775046 、 90715031) , 国家重点基础研究发展规划项目
(2009CB421502) , 上海台风研究所基金 (2008ST08)

Some characteristics on extratropical transition of tropical cyclones over the Western North Pacific

Song J in -J ie , Wang Yuan

Online:2015-03-30 Published:2015-03-30
About author: ( Key Laboratory of Mesoscale Severe Weather/ MOE , and School of Atmospheric Sciences ,
Nanjing University , Nanjing , 210093 , China)

摘要/Abstract

摘要： 本文利用 JRA 2 25 再分析资料 , 计算了 1979 - 2007 年西北太平洋热带气旋 ( TC) 的 3 个气旋相空间参数 . 通过分析变性 TC 的相空间特征 , 发现变性 TC 具有热力结构的不对称性和高低层热力的
冷异常 , 并将其作为识别 TC 变性的客观判据 . 对利用此判据修正后的 1979 - 2007 年《热带气旋年鉴》进行了统计分析 , 发现 : 变性 TC 的年频数和所有 TC 的年频数、变性 TC 的累年月频数与所有 TC 的累
年月频数存在显著的正相关 ; 变性 TC 所占的比例在春2夏和夏2秋季节转换时最高 ; 强度越强的 TC 在其北上过程中越容易发生变性过程 .

Abstract: When tropical cyclones (TCs) move over colder water and into stronger shear at higher latitudes , they often lose tropical characteristics and become more extratropical in nature , which is discribed as the extratropical
transition (ET) . There have been many publications about the climatology and synoptic features related to TCs underwent ET. However , too little attention is paid to the quality of the data including TCs underwent ET. In this
paper , the records of TCs underwent ET contained in the 1979 - 2007 tropical cyclone annual best 2 back data from the Shanghai Typhoon Institute is modified based on the cyclone phase space (CPS) method. There are three
parameters ( B , - V U L , and - V L T ) coordinating the CPS , that are calculated from the JRA 2 25 global reanalysis data with the horizontal resolution of 1. 25 ° × 1. 25 ° . TCs without ET hold the characteristics of symmetry and warm
anomaly of thermal structure , while the thermal asymmetry and cold anomaly are the dominant features of TCs underwent ET. Since this , an objective discriminating method in the definition of ET is proposed , which reads
| B | < 10 m , - V U T < 0 , and - V L T < 0. After the modification based on this criterion , some climatologic characteristics on TCs underwent ET in the period of 1979 - 2007 are obtained , which are concluded that : the annual
(or monthly) number of TCs underwent ET is proportional to that of total TCs; the ratio of TCs underwent ET in total TCs is the highest in the transition periods of spring 2 summer and summer 2 autumn; TCs with higher intensities
are more likely to complete ET in their northward moving. 　

宋金杰 , 王　元
. 西北太平洋变性热带气旋的若干特征

[J]. 南京大学学报(自然科学版), 2010, 46(3): 328–336.

Song J in -J ie , Wang Yuan
. Some characteristics on extratropical transition of tropical cyclones over the Western North Pacific
[J]. Journal of Nanjing University(Natural Sciences), 2010, 46(3): 328–336.

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