号强台风菲特极端降水成因初探.DOC

超强台风“丹娜丝”对1323号强台风“菲特”极端降水( 谢惠敏任福民 2.中国气象科学研究院 灾害天气国家重点实验室，北京，100081 3.长春市气象局，长春，130051 4.南京信息工程大学大气科学学院，南京，210044 摘 要 利用地面观测资料、台风定位资料、ECMWF全球再分析资料等，采用TC降水天气图客观识别法(OSAT)、TC路径相似面积指数（TSAI）和气流轨迹模式HYSPLIT等方法，从2013年第23号强台风“菲特”在我国东南沿海引发台风暴雨的极端性分析及其成因诊断入手，揭示了双台风作用对极端暴雨的增强作用。结果表明：首先，强台风“菲特”给浙江带来了1958年以来单站日降水排名第二的极端降水，余姚和奉化日降水量均为395.6mm；“菲特”降水过程有两个明显的强降水阶段。其次，秋季强台风“菲特”登陆后之所以出现如此强度且持续的台风暴雨，与超强台风“丹娜丝”的存在密不可分。在强降水第一阶段，双台风作用促成了降水的极端性，“丹娜丝”向降水区域输送了约79.0%的水汽，对杭州湾南侧的强降水过程有重要贡献；在“菲特”强降水第二阶段，“菲特”的环流已经基本消散，超强台风“丹娜丝”与冷空气的共同作用主导了这一阶段强降水的发生。 关键词：强台风“菲特”，极端降水，成因诊断，双台风作用 中图法分类号 P458 The role of supper typhoon “Danas” in extreme precipitation associated with severe typhoon Fitow XIE Huimin1,2 REN Fumin2 LI Guoping1 MA Liangchen3 ZHANG Fei2,4 1.College of Atmospheric Sciences,Chengdu University of Information Technology,Chengdu 610225,China 2.State key Laboratory of Severe Weather/Chinese Academy of Meteorological Sciences，Beijing 100081，China 3.Changchun Municipal Meteorological Bureau, Changchun 130051, China 4.College of Atmospheric Science，Nanjing University of Information Science and Technology，Nanjing 210044，China Abstract Based on surface observational data, typhoon track data and ECMWF global reanalysis data, using the objective synoptic analysis technique(OSAT), tropical cyclone(TC) track similarity area index(TSAI), and the airflow trajectory model(HYSPLIT4.9) and analyzing the characteristics and the causes of the extreme precipitation over coast Southeast China associated with severe typhoon Fitow, this study reveals the intensification role of binary typhoon in extreme precipitation. First, Fitow causes the maximum daily precipitation of 395.6mm at both Yuyao and Fenghua, which rank the second extreme daily TC precipitation in Zhejiang Province in record. The precipitation process has two distinct intense precipitation stages. Secondly, such heavy and continuous rainfall during and after Fitow’s landfall is mainly due to the exist of super typhoon Danas. In the first stage