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Sea-ice and snow-cover reduction drives high-latitude warming via the ice-albedo feedback, with evidence that atmospheric water vapor has increased as a greenhouse-gas contributor. Ocean heat fluxes from the North Atlantic and North Pacific further reduce sea ice, reinforcing warming. Observational and modeling results indicate potential pathways to middle-latitude effects through altered atmospheric winds, more frequent winter blocking, and increased continental snow cover, though natural variability prevents a conclusive attribution so far.",{"@graph":63,"@context":118},[64,80,101],{"@type":65,"itemListElement":66},"BreadcrumbList",[67,71,74,77],{"item":68,"name":69,"@type":70,"position":9},"https://docshare.wps.com","Home","ListItem",{"item":72,"name":10,"@type":70,"position":73},"https://docshare.wps.com/template/",2,{"item":75,"name":51,"@type":70,"position":76},"https://docshare.wps.com/template/general/",3,{"item":78,"name":59,"@type":70,"position":79},"https://docshare.wps.com/template/intensified-warming-of-the-arctic-causes-and-impacts-on-middle-latitudes/219748/",4,{"url":78,"name":59,"@type":81,"image":82,"author":87,"headline":59,"publisher":90,"fileFormat":93,"inLanguage":57,"description":61,"dateModified":94,"datePublished":95,"encodingFormat":93,"isAccessibleForFree":96,"interactionStatistic":97},"DigitalDocument",{"url":83,"@type":84,"width":85,"height":86},"https://docshare.wps.com/thumbnails/intensified-warming-of-the-arctic-causes-and-impacts-on-middle-latitudes/219748.png","ImageObject",442,249,{"name":88,"@type":89},"Mimi","Person",{"url":68,"name":91,"@type":92},"DocShare","Organization","application/vnd.openxmlformats-officedocument.wordprocessingml.document","2026-09-21","2026-09-08",true,{"@type":98,"interactionType":99,"userInteractionCount":47},"InteractionCounter",{"@type":100},"ViewAction",{"@type":102,"mainEntity":103},"FAQPage",[104,110,114],{"name":105,"@type":106,"acceptedAnswer":107},"What key factors explain the Arctic’s accelerated warming?","Question",{"text":108,"@type":109},"Sea-ice and snow-cover loss contributes through the ice-albedo feedback. Increased atmospheric water vapor and ocean heat fluxes into the Arctic from the North Atlantic and North Pacific also play important roles.","Answer",{"name":111,"@type":106,"acceptedAnswer":112},"How might Arctic warming affect middle-latitude weather and climate?",{"text":113,"@type":109},"Potential impacts include weakened upper-atmosphere west-to-east wind speeds, a higher frequency of winter blocking events that can slow temperature propagation, and increased continental snow cover influencing atmospheric circulation.",{"name":115,"@type":106,"acceptedAnswer":116},"Why is a conclusive demonstration of Arctic impacts on mid-latitudes still difficult?",{"text":117,"@type":109},"Natural variability has thus far precluded a definitive, conclusive attribution of mid-latitude weather and climate changes directly to Arctic forcing.","https://schema.org",{"og:url":78,"og:type":120,"og:title":59,"og:site_name":91,"og:description":61},"article",{"robots":122,"canonical":78},"index,follow",{"doc_id":124,"site_id":56},219748,1788889748,{"code":4,"msg":5,"data":127},{"doc_id":124,"user_id":128,"nickname":88,"user_avatar":129,"doc_module":9,"category_id":50,"category_name":51,"doc_title":59,"doc_description":61,"doc_content":130,"file_id":131,"file_url":132,"file_type":133,"file_size":134,"view_count":47,"is_deleted":4,"is_public":9,"is_downloadable":9,"audit_status":9,"page_count":135,"language":136,"language_code":57,"site_id":56,"html_lang":57,"table_of_contents":137,"faqs":138,"seo_title":139,"seo_description":61,"update_tm":125,"read_time":25},2336477974920,"https://ap-avatar.wpscdn.com/davatar_155a257f0dc6eb9ab79c44ca47cae57d","Accepted Manuscript\nIntensified warming of the Arctic: Causes and impacts on middle latitudes\nJohn E. Walsh\nPII:\tS0921-8181(14)00057-5\nDOI:\tdoi: \u0013 HYPERLINK \"http://dx.doi.org/10.1016/j.gloplacha.2014.03.003\" \\h \u001410.1016/j.gloplacha.2014.03.003\u0015\nReference:\tGLOBAL 2101\nTo appear in:\tGlobal and Planetary Change\nReceived date:\t15 August 2013\nRevised date:\t3 March 2014\nAccepted date:\t7 March 2014\nPlease  cite   this   article  as:     Walsh,    John   E.,  Intensified  warming  of  the   Arctic: Causes  and  impacts  on  middle  latitudes,   Global and Planetary Change (2014),     doi:\n\u0013 HYPERLINK \"http://dx.doi.org/10.1016/j.gloplacha.2014.03.003\" \\h \u001410.1016/j.gloplacha.2014.03.003\u0015\nThis  is a PDF file of an unedited manuscript that  has been accepted for publication. As  a  service to  our customers we are providing this  early version of the  manuscript. The manuscript will undergo copyediting, typesetting,  and review of the resulting proof before it is published in its final form.  Please note that  during the production process errors may be discovered which could affect the content,  and all legal disclaimers that apply to the journal pertain.\nIntensified warming of the Arctic: Causes and impacts on middle latitudes\nJohn E. Walsh\nInternational Arctic Research Center, University of Alaska, Fairbanks, Alaska, USA\nRevised March 2014\nCorresponding author address: International Arctic Research Center\nUniversity of Alaska\n930 Koyukuk Drive\nFairbanks, AK 99775 USA\u0013 HYPERLINK \"mailto:jwalsh@iarc.uaf.edu\" \\h \u0014 Email:  jwalsh@iarc.uaf.edu\u0015\nABSTRACT\nOver the past half century, the Arctic has warmed at about twice the global rate. The reduction of sea ice and snow cover has contributed to the high-latitude warming, as the maximum of the amplification during autumn is a fingerprint of the ice-albedo feedback. There is evidence that atmospheric water vapor, a greenhouse gas, has increased in the Arctic over the past several decades.  Ocean heat fluxes into the Arctic from the North Atlantic and North Pacific have also contributed to the Arctic warming through a reduction of sea ice.  Observational and modeling studies suggest that reduced sea ice cover and a warmer Arctic in autumn may affect the middle latitudes by weakening the west-to-east wind speeds in the upper atmosphere, by increasing the frequency of wintertime blocking events that in turn lead to persistence or slower propagation of anomalous temperatures in middle latitudes, and by increasing continental snow cover that can in turn influence the atmospheric circulation. While these effects on middle latitudes have been suggested by some analyses, natural variability has thus far precluded a conclusive demonstration of an impact of the Arctic on mid-latitude weather and climate.\nKeywords: climate, Arctic warming, polar amplification, sea ice, climate impacts\n1.   Introduction\nSeveral decades ago, the Arctic was an afterthought in climate change research.  Today it is at the forefront.  The recent acceleration of research on Arctic climate, together with widespread coverage by the media and interest by the public, has come in response to rapid changes in the Arctic over the past few decades.  By some measures, these changes are unprecedented.  While the changes are driven by warming of the ocean and atmosphere, they are manifested in sea ice, glaciers, ice sheets, permafrost and other components of the Arctic system.  The Arctic changes are even more intriguing because they are expected to play, and may already be playing, a role in further changes that impact middle latitudes and the rest of the globe.  As evidence of the increased public awareness of this topic, Hamilton and Lemcke-Stampone (2013) have recently reported results showing that a clear majority (60%) of surveyed members of the public now accepts that there is a connection between Arctic warming and mid-latitude weather.  Is such acceptance justified?   This question motivates the present paper, which has two main obj","cbCaitpIsejIsYwK","https://ap.wps.com/l/cbCaitpIsejIsYwK","docx",910865,42,"English","# Abstract\n# Introduction\n## Study objectives and structure\n# The recent warming\n## Temperature change and polar amplification\n## Uniqueness and reconstruction evidence","[{\"question\":\"What key factors explain the Arctic’s accelerated warming?\",\"answer\":\"Sea-ice and snow-cover loss contributes through the ice-albedo feedback. Increased atmospheric water vapor and ocean heat fluxes into the Arctic from the North Atlantic and North Pacific also play important roles.\"},{\"question\":\"How might Arctic warming affect middle-latitude weather and climate?\",\"answer\":\"Potential impacts include weakened upper-atmosphere west-to-east wind speeds, a higher frequency of winter blocking events that can slow temperature propagation, and increased continental snow cover influencing atmospheric circulation.\"},{\"question\":\"Why is a conclusive demonstration of Arctic impacts on mid-latitudes still difficult?\",\"answer\":\"Natural variability has thus far precluded a definitive, conclusive attribution of mid-latitude weather and climate changes directly to Arctic forcing.\"}]","Intensified warming of the Arctic - Causes and impacts on middle latitudes | DOCX"]