Geometric Characteristics of Tropical Cyclone Eyes before Landfall in South China Based on Ground-Based Radar Observations  

作　　者：Xiaotong ZHU Qingqing LI Jinhua YU Dan WU Kai YAO 

机构地区：[1]Key Laboratory of Meteorological Disaster of the Ministry of Education, Nanjing University of Information Science and Technology, Nanjing 210044, China [2]pacific Typhoon Research Center, Key Laboratory of Meteorological Disaster of the Ministry of Education Nanjing University of Information Science and Technology, and State Key Laboratory of Severe Weather, Nanjing 210044 China [3]Chinese Academy of Meteorological Sciences, Beijing 100081, China [4]Shanghai Typhoon Institute, Shanghai 200030, China [5]Key Laboratory for Mesoscale Severe Weather Ministry of Education, School of Atmospheric Sciences, Nanjing University, Nanjing 210023, China

出　　处：《Advances in Atmospheric Sciences》2018年第5期592-603,共12页大气科学进展（英文版）

基　　金：supported by the National (Key) Basic Research and Development (973) Program of China (Grant No.2015CB452803);the National Key Research and Development Program of China (Grant No.2017YFC1501601);the National Natural Science Foundation of China (Grant Nos.41475058,41730961 and 41575083);the Basic Research Fund of CAMS (Grant No.2016Z003);the Top-notch Academic Programs Project of Jiangsu Higher Education Institutions (TAPP)

摘　　要：The geometric characteristics of tropical cyclone（TC） eyes before landfall in South China are examined using groundbased radar reflectivity. It is found that the median and mean eye area decrease with TC intensity, except for the severe typhoon category, and the eye size increases with height. The increasing rate of eye size is relatively greater in upper layers.Moreover, the ratio of eye size change in the vertical direction does not correlate with TC intensity. No relationship is presented between the ratio of eye size change in the vertical direction and the vertical wind shear. No relationship between the vertical change in eye size and the eye size at a certain level is found, inconsistent with other studies. No relationship exists between the vertical change in eye size and the intensity tendency. The eye roundness values range mainly from 0.5 to 0.7, and more intense TCs generally have eyes that are more circular.The geometric characteristics of tropical cyclone（TC） eyes before landfall in South China are examined using groundbased radar reflectivity. It is found that the median and mean eye area decrease with TC intensity, except for the severe typhoon category, and the eye size increases with height. The increasing rate of eye size is relatively greater in upper layers.Moreover, the ratio of eye size change in the vertical direction does not correlate with TC intensity. No relationship is presented between the ratio of eye size change in the vertical direction and the vertical wind shear. No relationship between the vertical change in eye size and the eye size at a certain level is found, inconsistent with other studies. No relationship exists between the vertical change in eye size and the intensity tendency. The eye roundness values range mainly from 0.5 to 0.7, and more intense TCs generally have eyes that are more circular.

关 键 词：tropical cyclone eye geometric characteristics pre-landfall 

分 类 号：P412.25[天文地球—大气科学及气象学] P444