INFLUENCE OF THE INTERANNUAL VARIATION OF CROSSEQUATORIAL FLOW ON TROPICAL CYCLOGENESIS OVER THE WESTERN NORTH PACIFIC-中国期刊网

摘要 Theinfluenceoftheinterannualvariationofcross-equatorialflow(CEF)ontropicalcyclogenesisoverthewesternNorthPacific(WNP)isexaminedinthispaperbyusingthetropicalcyclone(TC)besttrackdatafromtheJointTyphoonWarningCenterandtheJRA-25reanalysisdataset.TheresultsshowedthatthenumberofTCsformingtotheeastof140°EoverthesoutheasternpartofthewesternNorthPacific(WNP)isinhighlypositivecorrelationwiththevariationoftheCEFnear125°Eand150°E,i.e.,thenumberoftropicalcyclogenesesincreaseswhenthecross-equatorialflowsarestrong.CompositeanalysesshowedthatduringtheyearsofstrongCEF,thevariationsofOLR,verticalwindshearbetween200-850hPa,850hParelativevorticityand200hPadivergencearefavorablefortropicalcyclogenesistotheeastof140°EoverthetropicalWNP,andviceversa.Moreover,itisalsodiscussedfromtheviewofbarotropicenergyconversionthatduringtheyearsofstrongCEF,aneastward-extendedmonsoontroughleadstotherapidgrowthofeddykineticenergyovertheeasternpartofWNP,whichisfavorablefortropicalcyclogenesis;butduringtheyearsofweakCEF,themonsoontroughislocatedwestwardinthewesternpartoftheWNP,consistentwiththegrowthareaofeddykineticenergy.Asaresult,therearefewerTCgenesesovertheeasternpartofWNP.Besides,theabruptstrengtheningofaclose-byCEF2-4daysbeforetropicalcyclogenesismaybetheoneofitstriggers.

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INFLUENCE OF THE INTERANNUAL VARIATION OF CROSSEQUATORIAL FLOW ON TROPICAL CYCLOGENESIS OVER THE WESTERN NORTH PACIFIC

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INFLUENCE OF THE INTERANNUAL VARIATION OF CROSSEQUATORIAL FLOW ON TROPICAL CYCLOGENESIS OVER THE WESTERN NORTH PACIFIC

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