Asymmetric Distribution of Convection in Tropical Cyclones over the Western North Pacific Ocean

作     者：Lu YANG Jianfang FEI Xiaogang HUANG Xiaoping CHENG Xiangrong YANG Juli DING Wenli SHI 

作者机构：Institute of Meteorology and OceanographyPLA University of Science and Technology 

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

年 卷 期：2016年第33卷第11期

页      面：1306-1321页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 08[工学] 081402[工学-结构工程] 081304[工学-建筑技术科学] 0706[理学-大气科学] 0813[工学-建筑学] 0814[工学-土木工程] 

基　　金：supported by the National Natural Science Foundation of China (Grant No. 41230421) the "973" project (Grant Nos. 2015CB452802 and 2013CB430101) of the Ministry of Science and Technology of China 

主　　题：convection Tropical convective asymmetric tropical mesoscale elongated typhoon likely storm 

摘      要：Forecasts of the intensity and quantitative precipitation of tropical cyclones（TCs） are generally inaccurate, because the strength and structure of a TC show a complicated spatiotemporal pattern and are affected by various factors. Among these, asymmetric convection plays an important role. This study investigates the asymmetric distribution of convection in TCs over the western North Pacific during the period 2005–2012, based on data obtained from the Feng Yun 2（FY2）geostationary satellite. The asymmetric distributions of the incidence, intensity and morphology of convections are *** show that the PDFs of the convection occurrence curve to the azimuth are sinusoidal. The rear-left quadrant relative to TC motion shows the highest occurrence rate of convection, while the front-right quadrant has the lowest. In terms of intensity, weak convections are favored in the front-left of a TC at large distances, whereas strong convections are more likely to appear to the rear-right of a TC within a 300 km range. More than 70% of all MCSs examined here are elongated systems, and meso-β enlongated convective systems（MβECSs） are the most dominant type observed in the outer region of a TC. Smaller MCSs tend to be more concentrated near the center of a TC. While semi-circular MCSs [MβCCSs, MCCs（mesoscale convective complexes）] show a high incidence rate to the rear of a TC, elongated MCSs [MβECSs, PECSs（persistent elongated convective systems）] are more likely to appear in the rear-right quadrant of a TC within a range of 400 km.