强台风“菲特”(1323)登陆后造成台州大暴雨成因分析  

Analysis on the Cause of Extremely Rainstorm of Severe Typhoon“Fitow”after Landfall in Taizhou

作　　者：陈莲[1,2] 谈志安 杨万裕 刘汉华 甘晶晶[1] 

机构地区：[1]浙江省台州市气象局,台州318000 [2]南京信息工程大学,南京210044 [3]路桥区气象局,路桥318500 [4]浙江省气象台,杭州310017

出　　处：《科学技术与工程》2015年第1期149-157,共9页Science Technology and Engineering

基　　金：浙江省气象科技计划项目(2011YB08);台州市科学技术局项目(2013A33475)资助

摘　　要：利用常规观测资料、加密自动站资料、NCEP1°×1°逐6h再分析资料和多普勒天气雷达资料,对2013年10月7日20时～8日08时强台风“菲特”登陆后残留低压造成的台州市大暴雨过程进行了成因分析.结果表明：此次暴雨分布不同于一般台风暴雨迎风坡降水量较大的分布特征,呈现与地形相关性较小的南北带状分布特征;暴雨主要受“菲特”残留云系、“丹娜丝”外围偏东气流和弱冷空气共同影响,其中“丹娜丝”转折点和弱冷空气南下渗透时间点的重合是主要影响因素;此外前期充沛的水汽条件,高低层辐散辐合配置,不稳定能量积聚释放,为暴雨发生提供了条件;后期降水回波列车效应明显,低层弱冷空气与海上东北气流的辐合线促使中小尺度的发生,使本次过程呈现出强降水时间较长的特点.Using conventional datas,intensive automatic weather station observations,NCEP 6-hourly reanalysis data with resolution 1 ° × 1 ° as well as Doppler weather radar,we analyze the cause of a terrential rain in Taizhou by residual vortex from severe typhoon Fitow （1323） after landfall between 20：00 p.m.in October 7,2013 to 8：00 a.m.in October 8,2013.The results show that the rain pattern of north south zonal distribution has a weak correlation with the terrain,which is different from the distribution of the large rainfall caused by general typhoon on windward slope.The residual circulation of severe typhoon Fitow,east airflow of typhoon Danas （1324）,and the weaker cold air from higher altitudes are responsible for this extremely rainstorm.Actrually,Danas＇ s turning point and weak cold air southward penetration point occur at the same time,which is the main influencing factors.Abundant water vapor benefits the heavy rainfall,the convergence in the low-troposphere,the divergence in the hightroposphere,the accumulated unstable energy are all the advantages for the maintaining rainstorm.Radar echo characteristics of ＂train effect＂,meso-scale and micro-scale convective systems caused by the low layer convergence line of weak cold air and northeast flow,make precipitation duration longer.

关 键 词：菲特 弱冷空气 诊断分析 大暴雨 

分 类 号：P458.3[天文地球—大气科学及气象学]