Super Typhoon Activity over the Western North Pacific and Its Relationship with ENSO

(整期优先)网络出版时间:2010-02-12
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Thispaperanalyzesthecharacteristicsofsupertyphoons(STYs)overthewesternNorthPacific(WNP)from1965to2005anddescribestheseasonalvariabilityofSTYactivity.TherelationbetweenSTYactivityandtheElNio-SouthernOscillation(ENSO)aswellasthepossiblereasonfortheinfluenceoftheENSOonSTYactivityarealsoinvestigated.Theresultsshowedthataboutonefifthofthetropicalcyclones(TCs)overtheWNPcouldreachtherankofSTY.MostSTYsappearedfromJulytoNovem-berwhiletherewasahighestratiobetweennumberofSTYsandtotalnumberofTCsinNovember.MostSTYsappearedeastofthePhilippineSea.InElNioyears,affectedbyseasurfacetemperature(SST),monsoontroughandweakverticalwindshear,TCfor-mationlocationsshiftedeastwardandthereweremoreSTYsthaninLaNiayearswhentheaffectingfactorschanged.