基于FY-2卫星云垂直运动解析近海突然增强台风内动力演变机制
投稿时间:2018-09-05  修订日期:2018-10-30  点此下载全文
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作者单位E-mail
王新 国家卫星气象中心 xinwang@cma.gov.cn 
郭强 国家卫星气象中心 guoqiang@cma.gov.cn 
文锐 国家卫星气象中心 18981228811@163.com 
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:近海台风突然增强监测预报仍然是业务和科研重点和难点,研究利用风云二号(FY-2)静止气象卫星高时空分辨率资料,选取近20年内南海登陆台风中最具备突然增强特征的两个台风2017年天鸽(Hato)和2012年韦森特(Vicente),综合考虑风垂直切变影响和辐射变化,形成用于表征台风内云垂直运动信号的计算方法,并应用于两台风近海快速增强的内动力演变机制解析。结果表明:两台风快速增强过程表现跷跷板式的热动力过程,云垂直上升运动的最大值向台风最核心区收拢,促进台风组织结构调整;最核心区0-50km内的云上升运动的持续增强,对台风发生突然增强贡献最显著,并伴有 1-2小时内的突变;FY-2卫星分钟级观测资料发挥了重要作用,结果可作为对台风结构和强度演变的高频次监测新手段为台风监测预报业务和科研工作提供参考。
中文关键词:台风强度突然增强,云垂直运动,内动力演变机制
 
Inner dynamic mechanism analysis for Tropical cyclone rapid intensification based on FY-2 cloud motion
Abstract:Tropical cyclone (TCs) rapid intensification (RI) often results in large forecast errors and it is among the most significant challenges facing operational TCs forecasting centers. In this study, Hato (2017) and Vicente (2012) were selected that have the most significant features happened in the South China Sea in the past 20 years. Based on Fengyun-2 (FY-2) geostationary meteorological satellite high-temporal resolution data, an algorithm for characterizing the cloud in TCs vertical motion signal was developed, which was combinated with vertical wind shear and inner dynamic information. And the authors investigate the interaction between the cloud vertical motion and RI. The results show that the process of RI like the seesaw, with the convection intensity increased and decreased, better organized TCs internal structure was proved TC intensity change with the maximum value of the cloud vertical motion gathered in the core area of the typhoon. The continuous increase of cloud ascending motion within 0-50km was the most significant contribution to RI, and sudden changes had happened within 1-2 hours. The findings corroborate previous RI study results while providing additional insights into internal structure in TC, also it provides references for TC monitoring and future study work.
keywords:Rapid Intensification  Cloud motion  Inner dynamic mechanism
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