AlternationoftheAtmosphericTeleconnectionsAssociatedwiththeNortheastChinaSpringRainfallduringaRecent60-YearPeriodZhiweiZHU*,RuiLU,ShanshanFU,andHuaCHENKeyLaboratoryofMeteorologicalDisaster,MinistryofEducation(KLME)/CollaborativeInnovationCenteronForecastandEvaluationofMeteorologicalDisasters(CIC-FEMD)/JointInternationalResearchLaboratoryofClimateandEnvironmentChange(ILCEC),NanjingUniversityofInformationScienceandTechnology,Nanjing210044,China(Received26January2022;revised20April2022;accepted6May2022)ABSTRACTNortheastChina(NEC)isChina’snationalgrainproductionbase,andthelocalprecipitationisvitalforagricultureduringthespringtime.Therefore,understandingthedynamicoriginsoftheNECspringrainfall(NECSR)variabilityisofsocioeconomicimportance.ThisstudyrevealsaninterdecadalchangeintheatmosphericteleconnectionsassociatedwiththeNECSRduringarecent60-yearperiod(1961–2020).Beforethemid-1980s,NECSRhadbeenrelatedtoaRossbywavetrainthatiscoupledwithextratropicalNorthAtlanticseasurfacetemperature(SST),whereas,sincethemid-1980s,NECSRhasbeenlinkedtoaquitedifferentRossbywavetrainthatiscoupledwithtropicalNorthAtlanticSST.BothRossbywavetrainscouldleadtoenhancedNECSRthroughanomalouscyclonesoverEastAsia.TheweakeningofthewesterlyjetoverNorthAmericaisfoundtobemainlyresponsibleforthealternationoftheatmosphericteleconnectionsassociatedwithNECSRduringtwoepochs.Keywords:NortheastChinaspringrainfall,Rossbywavetrain,interdecadalchange,westerlyjetstreamCitation:Zhu,Z.W.,R.Lu,S.S.Fu,andH.Chen,2023:AlternationoftheatmosphericteleconnectionsassociatedwiththeNortheastChinaspringrainfallduringarecent60-yearperiod.Adv.Atmos.Sci.,40(1),168−176,https://doi.org/10.1007/s00376-022-2024-3.ArticleHighlights:•ThelinkagebetweenNortheastChinaspringrainfallandtropicalNorthAtlanticSSTisunstable.•TheunstablerelationshipiscausedbythealternationoftheassociatedstationaryequivalentbarotropicRossbywavetrains.•ThealternationofthebarotropicRossbywavetrainsisinducedbytheweakeningofthewesterlyjetstreamoverNorthAmerica.1....
