South Asian High and Asian-Pacific-American Climate Teleconnection-中国期刊网

摘要 GrowingevidenceindicatesthattheAsianmonsoonplaysanimportantroleinaffectingtheweatherandclimateoutsideofAsia.However,thisactiveroleofthemonsoonhasnotbeendemonstratedasthoroughlyashasthevariabilityofthemonsooncausedbyvariousimpactingfactorssuchasseasurfacetemperatureandlandsurface.ThisstudyinvestigatestherelationshipbetweentheAsianmonsoonandtheclimateanomaliesintheAsian-Pacific-American(APA)sector.Ahypothesisistestedthatthevariabilityoftheupper-troposphericSouthAsianhigh(SAH),whichiscloselyassociatedwiththeoverallheatingofthelarge-scaleAsianmonsoon,islinkedtochangesinthesubtropicalwesternPacifichigh(SWPH),themidPacifictrough,andtheMexicanhigh.ThechangesinthesecirculationsystemscausevariabilityinsurfacetemperatureandprecipitationintheAPAregion.AstrongerSAHisaccompaniedbyastrongerandmoreextensiveSWPH.TheenlargementoftheSWPHweakensthemid-Pacifictrough.Asaresult,thesouthernportionoftheMexicanhighbecomesstronger.Thesechangesareassociatedwithchangesinatmosphericteleconnections,precipitation,andsurfacetemperaturethroughouttheAPAregion.WhentheSAHisstronger,precipitationincreasesinsouthernAsia,decreasesoverthePacificOcean,andincreasesovertheCentralAmerica.PrecipitationalsoincreasesoverAustraliaandcentralAfricaanddecreasesintheMediterraneanregion.Whilethesignalsinsurfacetemperatureareweakoverthetropicallandportion,theyareapparentinthemidlatitudesandovertheeasternPacificOcean.

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South Asian High and Asian-Pacific-American Climate Teleconnection

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South Asian High and Asian-Pacific-American Climate Teleconnection

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