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Recent Increased Warming of the Alaskan Marine Arctic Due to Midlatitude Linkages
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Recent Increased Warming of the Alaskan Marine Arctic Due to Midlatitude Linkages
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Journal Article
Recent Increased Warming of the Alaskan Marine Arctic Due to Midlatitude Linkages
2018
Overview
Alaskan Arctic waters have participated in hemispheric-wide Arctic warming over the last two decades at over twotimes the rate of global warming. During 2008-13, this relative warming occurred only north of the Bering Strait andthe atmospheric Arctic front that forms a north-south thermal barrier. This front separates the southeastern Bering Seatemperatures from Arctic air masses. Model projections show that future temperatures in the Chukchi and Beaufort seascontinue to warm at a rate greater than the global rate, reaching a change of ＋4℃ by 2040 relative to the 1981-2010mean. Offshore at 74~N, climate models project the open water duration season to increase from a current average of threemonths to five months by 2040. These rates are occasionally enhanced by midlatitude connections. Beginning in August2014, additional Arctic warming was initiated due to increased SST anomalies in the North Pacific and associated shiftsto southerly winds over Alaska, especially in winter 2015-16. While global warming and equatorial teleconnections areimplicated in North Pacific SSTs, the ending of the 2014-16 North Pacific warm event demonstrates the importance ofinternal, chaotic atmospheric natural variability on weather conditions in any given year. Impacts from global warming onAlaskan Arctic temperature increases and sea-ice and snow loss, with occasional North Pacific support, are projected tocontinue to propagate through the marine ecosystem in the foreseeable future. The ecological and societal consequences ofsuch changes show a radical departure from the current Arctic environment.
Publisher
Science Press,Springer Nature B.V,NOAA/Pacific Marine Environmental Laboratory, Seattle WA 98115, USA%NOAA/Pacific Marine Environmental Laboratory, Seattle WA 98115, USA,Joint Institute for the Study of Atmosphere and Oceans/University of Washington, Seattle WA 98115, USA%Department of Geography, Texas State University, San Marcos TX 78666, USA
Subject
