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1、台风“凤凰”路径强度变化对太湖北岸风雨影响的诊断陈潇潇,王璐璐,查书瑶,钱昊钟(江苏省无锡市气象局,江苏无锡214101)摘要:为探讨2014年第16号台风“凤凰”运动路径怪异和数次登陆强度不变的特点,了解其给太湖北岸地区带来的风雨影响,本研究通过对台风环境背景场的天气学分析和物理量诊断,对16号台风“风凰”的路径动态、强度变化、结构特征进行分析。结果表明:受副高进退和引导气流作用,台风“凤凰”沿着副高外围,先后经历西进、北上,东出的运动,深层引导气流能较好的指示台风的运动。台风“风凰”自身休积较小,发牛发展前期海温偏低,海洋热容量低,温度条件不利于台风的增强。
2、同时,台风流场结构极为不对称,随着垂直风切的增强,台风强度减弱,并经过数次登陆,破坏了环流结构,总体强度难以增强。由于台风路径偏东,强度偏弱,影响范围较小,水汽输送条件不利,H•无冷空气配合,太湖北岸地区在此次台风过程小以小雨为主,风力影响集屮在台风环流屮心附近,影响总体较小。关键词:风凰;路径;引导气流;不対称结构;太湖北岸;风雨影响中图分类号:P4文献标志码:A论文编号:casbl5010193AnalysisoftheEffectsbyFung-wongTrackandStrengthVariationonNorthBankofTaiLakeChenXia
3、oxiao,WangLulu,ZhaShuyao,QianHaozhong(WuxiMeteorologicalAdministration,WuxiJiangsu214101)Abstract:ThepaperaimstoinvestigatethecharacteristicsofunusualtrackandstrengthofseveretropicalstormFung-wong(1416),aswellastheeffectsofrainfallandwindcausedbyitin2014.Byanalyzingtheweatherenvironm
4、entalfieldsaroundFung-wonganddiagnosingitsphysicalquantities,thepathvariationandstrengthchangeaswellasstructurecharacteristicswerestudied.Resultsshowedthat:Fung-wongwasinfluencedbythechangeofsubtropicalhighandsteeringflow,movedalongthesubtropicalhighperiphery,travelledwestwardfirst,t
5、henheadednorthwardandeastwardmovedouttotheseafinally・Thedeepsteeringflowplayedgoodinroleofindication.Instrengthaspect,Fung-wongownedasmallsize,thepreviousseatemperaturewaslowsoastoreducetheheatcapacitylevel,herein,strengthofFung-wongcouldnotenhancebytheseconditions・Meanwhile,thestruc
6、tureofFung-wongwasasymmetricbystudyingthewindfiledcharacteristics.Fung-wongwasweakenedaftertheboostofverticalwindshear,itsstructurewasalsobrokenafterseverallanding・Overall,Fung-wongtrackedeastwardwithaweekstrengthtomakelimiteffect.Thevaportransportconditionwasunfavorablewithnocoopera
7、tionofthecoldair,andthereforetherainfallonthenorthbankofTaiLakewasmainlymoderate,thewindwasconcentratedaroundFung-wongcentercirculation.TheeffectcausedbyFung-wongwaslimited・Keywords:Fung-wong;typhoontrack;steeringflow;asymmetricstructure;northbankofTaiLake;rainandwindeffect0引言台风是影响中
8、国的主要灾害性天气,年均