Numerical Simulation of the Genesis of Typhoon Durian （2001） over the South China Sea： the Effect of Sea Surface Temperature-中国期刊网

摘要 TyphoonDurian(2001),whichformedovertheSouthChinaSea(SCS),wassimulatedbyusingtheWeatherResearchandForecasting(WRF)model.ThegenesisoftyphoonDurianwhichformedinthemonsoontroughwasreproducedbynumericalsimulations.Thesimulatedresultsagreereasonablywellwithobservations.Twonumericalexperimentsinwhichtheseasurfacetemperature(SST)waseitherdecreasedorincreasedwereperformedtoinvestigatetheimpactoftheSSTonthegenesisofthety-phoon.WhentheSSTwasdecreasedby5℃uniformlyforallgridsinthemodel,thewindscalculatedbecamedivergentinthelowertroposphereandconvergentintheuppertroposphere,creatingconditionsinwhichtheamountoftotallatentheatrelease(TLHR)waslowandthetropicalcyclone(TC)couldnotbeformed.Thissimulationshowstheimportanceoftheconvergenceinthelowertropo-sphereandthedivergenceintheuppertroposphereforthegenesisoftheinitialvortex.WhentheSSTwasincreasedby1℃uni-formlyforallgrids,astrongertyphoonwasgeneratedintheresultswithanincreaseofabout10ms-1inthemaximumsurfacewindspeed.Onlyminordifferencesinintensitywerenotedduringthefirst54hinthesimulationwiththewarmerSST,butapparentdif-ferencesinintensityoccurredafter54hwhenthevortexbegantostrengthentotyphoonstrength.ThisexperimentshowsthatwarmerSSTwillspeedthestrengtheningfromtropicalstormstrengthtotyphoonstrengthandincreasethemaximumintensityreached,whileonlyminorimpactcanbeseenduringtheearlierstageofgenesisbeforetheTCreachesthetropicalstormstrength.Theresultssug-gestthattheamountofTLHRmaybethedominantfactorindeterminingtheformationandtheintensificationoftheTC.

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Numerical Simulation of the Genesis of Typhoon Durian （2001） over the South China Sea： the Effect of Sea Surface Temperature

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Numerical Simulation of the Genesis of Typhoon Durian （2001） over the South China Sea： the Effect of Sea Surface Temperature

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