孟加拉湾热带气旋Vardah引发罕见对称降水的机制研究  

Mechanism of Rare Symmetrical Precipitation Induced by Tropical Cyclone Vardah over the Bay of Bengal

作　　者：邢雪婷 葛芯恒 王雪 郜薇薇 倪冉 吕海滨 XING Xueting;GE Xinheng;WANG Xue;GAO Weiwei;NI Ran;Lü Haibin(School of Marine Technology and Geomatics,Jiangsu Ocean University,Lianyungang 222005,China)

机构地区：[1]江苏海洋大学海洋技术与测绘学院,江苏连云港222005

出　　处：《江苏海洋大学学报（自然科学版）》2021年第3期11-18,共8页Journal of Jiangsu Ocean University:Natural Science Edition

基　　金：测绘工程国家一流专业建设项目;海洋技术江苏省一流专业建设项目;江苏省高校优势学科建设工程资助项目(PAPD);江苏省研究生科研与实践创新计划项目(SJCX20_1244,SJCX20_1246,SJCX21_1487);江苏省海洋资源开发研究院开放基金(JSIMR202005);国家自然科学基金资助项目(62071207)。

摘　　要：利用卫星观测数据和NCEP/NCAR再分析数据,分析了热带气旋Vardah在孟加拉湾引发的少有的对称降水的机制。结果表明:弱环境风切变条件有利于维持和增加气旋强度,但2016年12月10日至11日的气旋增强是由于冷空气入侵增大了气旋中心温度梯度所致;降水对称性分布与气旋强度之间关系密切,强度越强,对称性越明显;水汽通量、垂直速度、对流结构及风速的对称分布决定了降水分布的对称性特征。Based on the satellite observation data and NCEP/NCAR reanalysis data,the mechanism of tropical cyclone Vardah causing rare symmetrical precipitation over the Bay of Bengal was analyzed.The results showed that under the condition of weak environmental wind shear,the intensity of cyclone was favorable to maintain and increase,but the intensification of cyclone from December 10 to 11,2016 was due to the cold air invasion increasing the temperature gradient in the center of the cyclone.There is a close relationship between the symmetry distribution of precipitation and cyclone intensity.The stronger the intensity is,the more obvious the symmetry distribution is.The symmetrical distribution of water vapor flux,vertical velocity,convective structure and wind speed determines the symmetrical characteristics of precipitation distribution.

关 键 词：对称降水 暴雨结构演变 冷空气入侵 内核降水 环境风切变 

分 类 号：P447[天文地球—大气科学及气象学]