热带气象学报2018，Vol.34Issue(3)：353-359,7.DOI:10.16032/j.issn.1004-4965.2018.03.009
西北太平洋热带气旋变性的客观判据研究
A STUDY ON THE CRITERION OF EXTRATROPICAL TRANSITION OF WESTERN NORTH PACIFIC TROPICAL CYCLONES
摘要
Abstract
A number of the tropical cyclones (TC) moving into the mid-latitude regions sometimes undergo a process of extra-tropical transition (ET). It can frequently produce intense precipitation and strong winds which can be a serious threat to land and maritime activities. As the phase space method considers mainly the thermodynamic characteristics but rarely the dynamic characteristics of TC, two more parameters are proposed here to improve the method of determining the extra-tropical transition. One is an inclined vortex parameter and the other is the vertical wind shear. More than 200 cases of TC are analyzed by using the two parameters to examine their reliability. According to the study above, an objective criterion of ET is developed for operational application. And there is also a general flow which can separate the TC and extra-tropical cyclones. And then a test based on the data from 2000 to 2007 is carried out. The results show that the objective criterion to distinguish TC from extra-tropical cyclones is much better than the phase space method only.关键词
热带气旋/台风变性/CPS方法/轴倾斜/风速切变Key words
tropical cyclone/extra-tropical transition/phase space/vortex-tilt/wind shear分类
天文与地球科学引用本文复制引用
郭蓉,雷小途,汤杰..西北太平洋热带气旋变性的客观判据研究[J].热带气象学报,2018,34(3):353-359,7.基金项目
国家重点基础研究发展计划(973 计划)(2013CB430305) （973 计划）
公益性行业(气象)科研专项(GYHY201406010) （气象）
国家自然科学基金(41475060、41275067、41775065、41405060)共同资助 （41475060、41275067、41775065、41405060）
