COMPARISONS OF THE CHARACTERISTICS OF TROPICAL CYCLONES EXPERIENCING EXTRATROPICAL TRANSITION IN THE WESTERN NORTH PACIFIC BASED ON DIFFERENT DATASETS-中国Betway体育网页登陆

摘要 Thedifferencesintheclimatologyofextratropicaltransition(ET)ofwesternNorthPacifictropicalcyclones(TCs)wereinvestigatedinthisstudyusingtheTCsbest-trackdatasetsofChinaMeteorologicalAdministration(CMA),JapanMeteorologicalAgency(JMA)andtheJointTyphoonWarningCenter(JTWC).TheresultsshowthattheETidentification,ETcompletiontime,andpost-ETdurationreportedintheJTWCdatasetaregreatlydifferentfromthoseinCMAandJMAdatasetsduring2004-2010.However,thekeydifferencesbetweentheCMAandJMAdatasetsfrom1951to2010aretheETidentificationandthepost-ETduration,becauseofinconsistentobjectiveETcriteriausedinthecenters.FurtheranalysisindicatesthatannualETpercentageofCMAwaslowerthanthatofJMA,andexhibitedaninterannualdecreasingtrend,whilethatofJMAwasanunchangedtrend.ThewesternNorthPacificETeventsoccurredmainlyduringtheperiodJunetoNovember.ThelatitudeofEToccurrenceshiftednorthwardfromFebruarytoAugust,followedbyasouthwardshift.MostofETeventswereobservedbetween35°Nand45°N.Fromaregionalperspective,TCstendedtoundergoETinJapanandtheoceaneasttoit.ItisfoundthatTCswhichexperiencedtheETprocessathigherlatitudesweregenerallymoreintenseattheETcompletiontime.TCscompletingtheEToverlandoroffshorewereweakerthanthosefinishingtheETovertheocean.MostoftheTCsweakened24hbeforethecompletionofET.Incontrast,21%(27%)oftheTCsshowedanintensificationprocessbasedontheCMA(JMA)datasetduringthepost-ETperiod.TheresultspresentedinthisstudyindicatethatconsistentETdeterminationcriteriaareneededtoreducetheuncertaintyinvolvedinETidentificationamongthecenters.

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COMPARISONS OF THE CHARACTERISTICS OF TROPICAL CYCLONES EXPERIENCING EXTRATROPICAL TRANSITION IN THE WESTERN NORTH PACIFIC BASED ON DIFFERENT DATASETS

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