Interdecadal variability of winter precipitation in Southeast China.pdf

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1、ClimDynDOI10.1007/s00382-014-2048-1InterdecadalvariabilityofwinterprecipitationinSoutheastChinaLingZhang•XiuhuaZhu•KlausFraedrich•FrankSielmann•XiefeiZhiReceived:6November2013/Accepted:6January2014ÓTheAuthor(s)2014.ThisarticleispublishedwithopenaccessatSpringerlink.comAbstractInterdecadalva

2、riabilityofobservedwinterprecipitationincreaseinfluencedbycirculationanomaliesprecipitationinSoutheastChina(19612010)ischarac-overthemid-to-highlatitudes.(4)Theabnormalmoistureterizedbythefirstempiricalorthogonalfunctionofthetransportalongthesouthwesternboundaryoftheabnormalthree-monthlyStand

3、ardizedPrecipitationIndex(SPI)sub-anticycloneoversouthJapanisrelatedtoanomaloussouth-jectedtoa9-yearrunningmean.ForinterdecadaltimeeasterliesmodulatedbytheSSTanomaliesoverWesternscalesthedominatingspatialmodesrepresentmonopolePacificOcean;apositive(negative)SSTanomalywillfeaturesinvolvingthe

4、ArcticOscillation(AO)andtheseastrengthen(weaken)warmandhumidairtransport,leadingsurfacetemperature(SST)anomalies.Dynamiccompositetoabundant(reduced)precipitationinSoutheastChina.analysis(basedonNCEP/NCARreanalyzes)revealstheThatisbothAOandSSTanomaliesdeterminethenon-followingresults:(1)Inte

5、rdecadalSPI-variationsshowalineartrendobservedinwinterprecipitationoverSoutheasttrendfromadryerstateinthe1970sviaanincreaseduringChina.the1980stowardsstabilizationonwetterconditionscom-mencingwiththe1990s.(2)IncreasingwetnessinSouth-KeywordsPrecipitation
SPI
ArcticOscillation
eastChinaisatt

6、ributedtoanabnormalanticycloneoverSeaSurfaceTemperaturesouthJapan,withnorthwardtransportofwarmandhumidairfromthetropicalPacifictoSouthChina.(3)Inmid-to-highlatitudestheweakenedsouthwardflowofpolarair-massesinduceslow-levelwarmingoverEurasiadueto1IntroductionstrongerAObywarmerzonaltemperaturea

7、dvection.ThisindicatesthatAOisattributedtotheSoutheastChinaSouthChinaislocatedinEastAsianMonsoonregionswhereweatherandclimatedisastersbringfrequentdamageinwinter.Forexample,in2005and2008,extremefreezingL.Zhang(&)
K.Fraedrich
X.ZhirainandsnowinsouthernChi