STUDY ON THE GENESIS OF ASYMMETRICAL DISTRIBUTION CHARACTERISTICS OF PRECIPITATION ASSOCIATED WITH THE TYPHOON HAITANG （2005） FROM THE VIEW OF ATMOSPHERIC FACTOR-中国期刊网

摘要 ThedistributionofprecipitationfieldfromthetyphoonHaitang(2005)duringitslandingonFujianprovinceshowsobviousasymmetricfeature.BasedontheNCEP/NCARFNL(FinalAnalysis)data,thisstudyrevealsthecontributionsofatmosphericfactortotheasymmetricaldistributioncharacteristicsofprecipitationassociatedwiththetyphoon,throughtheanalysisofwatervaporcondition,verticalascendingmotioncondition,thecalculationofthedryQvectoranditsdecomposition,andadiabaticheatingintheaircolumnof1000hPa-600hPa(loweratmosphere)and500hPa-100hPa(upperatmosphere).Theresultsareasfollows:(1)Intheloweratmosphere,thehumidityonbothsidesoftyphoonpathcanbeequivalent,whileitismorewetontherightsidethanleftintheupperatmosphere,whichobviouslypresentsasymmetricdistributioncharacteristics.(2)Bothrangeandintensityoftheverticalmotionontherightsidearewiderandstrongerthancounterpartsontheleftsidenomatterinthelowerorupperatmosphere.(3)Intheupperatmosphere,forcingroleofatmosphereinverticalupwardmotionontherightsideoftyphoonpathisthesameasthatontheleft,whileitissignificantlydifferentintheloweratmosphere,whichissignificantlybroaderinscopeandstrongerintheintensity,alongwithobviousasymmetricdistributioncharacteristics.Inaddition,thefurtheranalysisoftheQvectordecompositionindicatesthattheforcingeffectofmesoscaleweathersystemsonverticalupwardmotionisstrongerthanthatoflargescaleweathersystemsintheloweratmosphere.(4)Theadiabaticheatingalwaysexistsonbothlowerandupperatmosphere,andtherangeandintensityoftheadiabaticheatingforcingshowedasymmetricdistributiononbothlowerandupperatmosphere.(5)Inasummary,theupperatmospherehumidityconditions,theforcingroleofloweratmosphereinverticalupwardmotion,especially,tomesoscaleweathersystem,andadiabaticheatingintheloweratmosphere,allshowsimilarasymmetricdistributioncharacteristics

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STUDY ON THE GENESIS OF ASYMMETRICAL DISTRIBUTION CHARACTERISTICS OF PRECIPITATION ASSOCIATED WITH THE TYPHOON HAITANG （2005） FROM THE VIEW OF ATMOSPHERIC FACTOR

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STUDY ON THE GENESIS OF ASYMMETRICAL DISTRIBUTION CHARACTERISTICS OF PRECIPITATION ASSOCIATED WITH THE TYPHOON HAITANG （2005） FROM THE VIEW OF ATMOSPHERIC FACTOR

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