摘要
Theroleofwintersea-iceintheLabradorSeaasaprecursorforprecipitationanomaliesoversoutheasternNorthAmericaandWesternEuropeinthefollowingspringisinvestigated.Ingeneralterms,astheseaiceincreases,theprecipitationalsoincreases.Inmoredetail,however,analysesindicatethatboththewintersea-iceandtheseasurfacetemperature（SST）anomaliesrelatedtoincreasesinwintersea-iceintheLabradorSeacanpersistintothefollowingspring.Thesefeaturesplayaforcingroleinthespringatmosphere,whichmaybethephysicalmechanismbehindtheobservationalrelationshipbetweenthewintersea-iceandspringprecipitationanomalies.TheoceanicforcingsinspringincludeArcticsea-iceanomaliesandSSTanomaliesinthetropicalPacificandhigh-latitudeNorthAtlantic.Multi-modelCoupledModelIntercomparisonProjectPhase5andAtmosphericModelIntercomparisonProjectsimulationresultsshowthattheatmosphericcirculationresponsetothecombinationofsea-iceandSSTissimilartothatobserved,whichsuggeststhattheoceanicforcingsareindeedthephysicalreasonfortheenhancedspringprecipitation.SensitivityexperimentsconductedusinganatmosphericgeneralcirculationmodelindicatethattheincreasesinprecipitationoversoutheasternNorthAmericaaremainlyattributabletotheeffectoftheSSTanomalies,whiletheincreasesoverWesternEuropearemainlyduetothesea-iceanomalies.AlthoughmodelsimulationsrevealthattheSSTanomaliesplaytheprimaryroleintheprecipitationanomaliesoversoutheasternNorthAmerica,theobservationalstatisticalanalysesindicatethattheareaofsea-iceintheLabradorSeaseemstobetheprecursorthatbestpredictsthespringprecipitationanomaly.
出版日期
2018年01月11日（中国期刊网平台首次上网日期，不代表论文的发表时间）
