TyphoonMegi,the13thtyphoonofthe2010typhoonseason,wasselectedforcasestudybyutilizingtheWeatherResearchandForecasting(WRF)model.Twelvesensitivityexperimentswithvariousinitialtropicalcyclone(TC)intensitiesandsizeswereconductedtoinvestigatetheirimpactsonthesimulationoftyphoontrack.InteractionbetweenTCandthewesternPacificsubtropicalhigh(WPSH)wasalsoanalyzedtoexplorethemechanismfortheimpactonTCtrackoftheinitialTCintensityandsize.NumericalresultsindicatethatthesimulatedTCsizeandTCtrackaresensitivetoinitialTCintensityandsize.StrongerinitialTCintensityandlargerinitialTCsizeoftenleadtolargersimulatedTCsizeandmakeTCturnnorthwardearlier.Furtheranalysissuggeststhat,withtheincreaseofinitialTCintensityandsize,moreairmassentersintotheTCregion,whichsubsequentlyreducestheextentofWPSH.Asaresult,thesteeringflowchangessignificantlyandeventuallycausestheTCtoturnnorthwardearlier.ThepresentstudyconfirmsthattheinitialTCintensityandsizehavecertaininfluencesontheTCtracksimulation,whichdemonstratestheimportanceofaccurateinitialconditionforsuccessfulsimulationoftheTCintensityandTCtrack.Moreover,italsodeepensourunderstandingoftheinteractionbetweenTCandWPSH,provideshelpfulcluesfortheTCtrackchangestudy,anddiscussesthefuturedirectionsforimprovementofTCtrackforecast.
