SPATIO-TEMPORAL VARIATION OF SEASONAL EXTREME WET DAYS IN CHINA AND ITS RELATIONSHIP WITH SST ANOMALIES-中国Betway体育网页登陆

摘要 Withdailyprecipitationrecordsat586stationsinChinafor1960-2004,thisstudyinvestigatesthespatio-temporalvariationofthenumberofextremewetdays(NEWD)foreachseasoninChinaanditsrelationshipwithSSTanomaliesandassociatedatmosphericcirculationanomalypatterns,inwhichathresholdofextremeprecipitationforaseasonandastationisdefinedasthevalueofthe90thpercentilewhentheprecipitationrecordsforwetdaysduringtheseasonarerankedinanincreasingorder.ResultsshowthattherearesignificantincreasesoftheNEWDalongtheYangtzeRivervalleyduringwinterandsummer,inNorthChinaduringwinter,inSouthChinaduringspring,inNortheastChinaduringwinterandspring,andinNorthwestChinathroughouttheseasons,whilethereisaremarkabledecreaseinNorthChinaduringsummer.Besidesthelineartrend,theNEWDalsoexhibitsconsiderableinterannualandinterdecadalvariabilities.Aftereliminatingthelineartrend,theNEWDanomaliesshowdistinctseasonalpatterns.TheNEWDanomaliesarecharacterizedbya"dipole"modewithoppositephasesbetweennorthernandsouthernChinainspringandautumn,a"tri-pole"modewithoppositephasesbetweenYangtzeRivervalleyandsouthernandnorthernChinainsummer,anda"monopole"modewiththesamephaseovermostofChinainwinter.TherelationshipoftheNEWDanomaliesinChinawiththeSSTanomaliesinIndianandPacificOceansisfoundtobemainlydependentontheENSO,andassociatedatmosphericcirculationanomalypatternsfortheENSO’simpactontheNEWDinChinaareidentified.

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SPATIO-TEMPORAL VARIATION OF SEASONAL EXTREME WET DAYS IN CHINA AND ITS RELATIONSHIP WITH SST ANOMALIES

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