摘要
Thisstudyexaminespre-industrialcontrolsimulationsfromCMIP5climatemodelsinanefforttobetterunderstandthecomplexrelationshipsbetweenArcticseaiceandthestratosphere,andbetweenArcticseaiceandcoldwintertemperaturesoverEurasia.WepresentnormalizedregressionsofArcticsea-iceareaagainstseveralatmosphericvariablesatextendedleadandlagtimes.Statisticallysignificantregressionsarefoundatleadsandlags,suggestingbothatmosphericprecursorsof,andresponsesto,lowseaice;butgenerally,theregressionsarestrongerwhentheatmosphereleadsseaice,includingaweakerpolarstratosphericvortexindicatedbypositivepolarcapheightanomalies.Significantpositivemidlatitudeeddyheatfluxanomaliesarealsofoundtoprecedelowseaice.Wearguethatlowseaiceandraisedpolarcapheightarebotharesponsetothisenhancedmidlatitudeeddyheatflux.Theso-called＂warmArctic,coldcontinents＂anomalypatternispresentonetotwomonthsbeforelowseaice,butisabsentinthemonthsfollowinglowseaice,suggestingthattheEurasiancoolingandlowseaicearedrivenbysimilarprocesses.Lastly,ourresultssuggestadependenceonthegeographicregionoflowseaice,withlowBarents-KaraSeaicecorrelatedwithaweakenedpolarstratosphericvortex,whilstlowSeaofOkhotskiceiscorrelatedwithastrengthenedpolarvortex.Overall,theresultssupportanotionthattheseaice,polarstratosphericvortexandEurasiansurfacetemperaturescollectivelyrespondtolarge-scalechangesintroposphericcirculation.
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）
