NUMERICAL SIMULATIONS OF THE PACIFIC MERIDIONAL MODE IMPACTS ON TROPICAL CYCLONES ACTIVITY OVER THE WESTERN NORTH PACIFIC-中国期刊网

摘要 BasedonanalysesoftherelationshipbetweenPacificMeridionalMode(PMM)andnumberoftropicalcyclones(TCs)activityoverthewesternNorthPacific,theimpactsofthePMMonTcactivityoverthewesternNorthPacificarestudiedusingnumericalsimulationswithanAtmosphericGeneralCirculationModel(CAM3)ofNationalCenterforAtmosphericResearch(ofUSA).TheresultshowsthatthePMMhasimpactsonthelarge-scalegeneratingenvironmentofTCs,thusaffectingtheirnumberandstrength.ThenumericalsimulationsusingtheNCARCAM3indicatethatwiththeinclusionoftheforcingfromseasurfacetemperature(SST)ofthePMM,thereappearsadecreasedmagnitudeoftheverticalzonalwindshear,largeproportionofrelativehumidity,anomalouswesterlywindatlowlevelsandanomalouseasterlywindathighlevels,inassociationwithanomalouscycloniccirculationatlowlevelsandanomalousanti-cycloniccirculationathighlevelsoverthetropicalwesternPacific.Thus,thePMMprovidesfavorableenvironmentforthetyphoongenesis.Inthesensitivityexperiment,TCshavelargerstrength,lowerSSTatthecenter,strongertangentialwindat850hPaandintensifiedwarmcoresathighlevels.Inthispaper,thesimulationresultsaresimilartothatinthedataanalyses,whichrevealstheimportantimpactofthePMMonTCactivityoverthewesternNorthPacific.

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NUMERICAL SIMULATIONS OF THE PACIFIC MERIDIONAL MODE IMPACTS ON TROPICAL CYCLONES ACTIVITY OVER THE WESTERN NORTH PACIFIC

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NUMERICAL SIMULATIONS OF THE PACIFIC MERIDIONAL MODE IMPACTS ON TROPICAL CYCLONES ACTIVITY OVER THE WESTERN NORTH PACIFIC

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