Statistical Characteristics and Mechanistic Analysis of Suddenly Reversed Tropical Cyclones over the Western North Pacific Ocean

作     者：LUO Xia FEI Jianfang HUANG Xiaogang CHENG Xiaoping DING Juli HE Yiqiang 

作者机构：College of Meteorology and Oceanography PLA University of Science and Technology Beijing Aerospace Control Center 

出 版 物：《Advances in Atmospheric Sciences》 (大气科学进展（英文版）)

年 卷 期：2015年第32卷第4期

页      面：565-576页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 070104[理学-应用数学] 0706[理学-大气科学] 0701[理学-数学] 

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 41230421, 41005029 and 41105065) the National Public Benefit (Meteorology) Research Foundation of China (Grant No. GYHY201106004) 

主　　题：tropical cyclone suddenly reversed turning statistical analysis steering flow 

摘      要：Based on best track data of tropical cyclones（TCs） from the Japan Meteorological Agency, the characteristics of suddenly reversed TCs（SRTCs）, which have turning angles usually approaching 180°, are statistically analyzed from 1949 to 2011 over the western North Pacific Ocean. The typical large-scale circulation patterns of SRTCs are investigated using reanalysis data and dynamical composite analysis. Results show that turnings mainly occur in low latitudes between 10°N and 20°N,and mainly west of 135°E. The majority of SRTCs reach their peak intensity at, or slightly before, the turning time and subsequently decrease at some variable rate. Specifically, SRTCs are divided into four types, each containing two groups（*** groups in total） in terms of the moving-direction changes. The moving speed of all SRTC types except the south–north type decreases to its lowest during the 24 h, corresponding to a significant reduction in the primary steering *** to the analysis of the 13 typical flow patterns found in this study, we suggest that sudden track changes are caused by the reversal steering flow. The original balance of the background flow patterns are broken up by new systems, e.g. binary TCs or dispersion-induced anticyclones. Additionally, sudden track changes are often due to double ridge variations of the subtropical high or weakened/strengthened high pressure in the east and west, respectively.