ThisstudyusesNCEP/NCARdailyreanalysisdata,NOAAoutgoinglong-waveradiation(OLR)data,thereal-timemultivariateMJO(RMM)indexfromtheAustralianBureauofMeteorologyandTibetanPlateauvortex(TPV)datafromtheChengduInstituteofPlateauMeteorologytodiscussmodulationoftheMadden-JulianOscillation(MJO)ontheTibetanPlateauVortex(TPV).Waveletandcompositeanalysisareused.ResultsshowthattheMJOplaysanimportantroleintheoccurrenceoftheTPVthatthenumberofTPVsgeneratedwithinanactiveperiodoftheMJOisthreetimesasmuchasthatduringaninactiveperiod.Inaddition,duringtheactiveperiod,thenumberoftheTPVsgeneratedinphases1and2islargerthanthatinphases3and7.Aftercompositingphases1and7separately,allmeteorologicalelementsinphase1areapparentlyconducivetothegenerationoftheTPV,whereasthoseinphase7aresomewhatconstrained.Withitseastwardpropagationprocess,theMJOconvectioncentrespreadseastward,andtheverticalcirculationwithinthetropicalatmospherechanges.Duetotheinteractionbetweenthemid-latitudeandlow-latitudeatmosphere,changesoccurinthebarocliniccharacteristicsoftheatmosphere,theavailablepotentialenergyandeddyavailablepotentialenergyoftheatmosphere,andthecirculationstructuresoftheatmosphereovertheTibetanPlateau(TP)andsurroundingareas.Thisresultsinsignificantlydifferentwatervapourtransportationandlatentheatdistribution.Advantageousanddisadvantageousconditionsthereforealternate,leadingtoasignificantdifferenceamongthenumbersofplateauvortexindifferentphases.
