IMPACT OF CONVECTION OVER THE SOUTH CHINA SEA ON TROPICAL CYCLONE MOTION OVER THE WESTERN NORTH PACIFIC DURING SUMMER MONSOON-中国期刊网

摘要 Theintraseasonaloscillation(ISO)oftheSouthChinaSea(SCS,105-120°E,5-20°N)convectionanditsinfluencesonthegenesisandtrackofthewesternNorthPacific(WNP)tropicalcyclones(TCs)wereexplored,basedonthedailyaverageofNCEP/NCARreanalysisdata,theOLRdataandthewesternNorthPacifictropicalcyclonebest-trackdatafrom1979to2008.ThemechanismoftheinfluencesofISOonTCmovementandthecorrespondinglarge-scalecirculationwerediscussedbyatrajectorymodel.Itwasfoundasfollows.(1)DuringtheSCSsummermonsoon,theSCSconvectionexhibitstheISOfeatureswithactivephasesalternatingwithinactivephases.Themonsooncirculationpatternsaresignificantlydifferentduringthesetwophases.WhentheSCSconvectionisactive(inactive),theSCS-WNPmonsoontroughstretcheseastward(retreatswestward)duetotheactivity(inactivity)ofSCSmonsoon,andtheWNPsubtropicalhighretreatseastward(stretcheswestward),whichenhances(suppresses)themonsooncirculation.(2)TheamountofTCgenesisintheactivephaseismuchmorethanthatintheinactivephase.AmajorityofTCsformwestof135°Eduringtheactivephasesbuteastof135°Eintheinactivephases.(3)TheTCsenteringtheareawestof135°Eandsouthof25°NwouldmovestraightintotheSCSintheactivephase,orrecurvenorthwardintheinactivephase.(4)Simulationresultsshowthatthesteeringflowassociatedwiththeactive(inactive)phasesisinfavorofstraight-moving(recurving)TCs.Meanwhile,theimpactsofthelocationsofTCgenesisonthecharacteristicsofTCtrackcannotbeignored.TCsthatoccurredfatherwestwardaremorelikelytomovestraightintotheSCSregion.

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IMPACT OF CONVECTION OVER THE SOUTH CHINA SEA ON TROPICAL CYCLONE MOTION OVER THE WESTERN NORTH PACIFIC DURING SUMMER MONSOON

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IMPACT OF CONVECTION OVER THE SOUTH CHINA SEA ON TROPICAL CYCLONE MOTION OVER THE WESTERN NORTH PACIFIC DURING SUMMER MONSOON

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