What drove the dramatic retreat of arctic sea ice during summer 2007?
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Auteurs : Jinlun Zhang [États-Unis] ; Ron Lindsay [États-Unis] ; Mike Steele [États-Unis] ; Axel Schweiger [États-Unis]Source :
- Geophysical Research Letters [ 0094-8276 ] ; 2008-06.
Abstract
A model study has been conducted of the unprecedented retreat of arctic sea ice in the summer of 2007. It is found that preconditioning, anomalous winds, and ice‐albedo feedback are mainly responsible for the retreat. Arctic sea ice in 2007 was preconditioned to radical changes after years of shrinking and thinning in a warm climate. During summer 2007 atmospheric changes strengthened the transpolar drift of sea ice, causing more ice to move out of the Pacific sector and the central Arctic Ocean where the reduction in ice thickness due to ice advection is up to 1.5 m more than usual. Some of the ice exited Fram Strait and some piled up in part of the Canada Basin and along the coast of northern Greenland, leaving behind an unusually large area of thin ice and open water. Thin ice and open water allow more surface solar heating because of a much reduced surface albedo, leading to amplified ice melting. The Arctic Ocean lost additional 10% of its total ice mass in which 70% is due directly to the amplified melting and 30% to the unusual ice advection, causing the unprecedented ice retreat. Arctic sea ice has entered a state of being particularly vulnerable to anomalous atmospheric forcing.
Url:
DOI: 10.1029/2008GL034005
Affiliations:
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Res. Lett.</title><idno type="ISSN">0094-8276</idno><idno type="eISSN">1944-8007</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><date type="published" when="2008-06">2008-06</date><biblScope unit="volume">35</biblScope><biblScope unit="issue">11</biblScope><biblScope unit="page" from="/">n/a</biblScope><biblScope unit="page" to="/">n/a</biblScope></imprint><idno type="ISSN">0094-8276</idno></series><idno type="istex">428870A506156F1D7A6FA65E12D3204578F60D66</idno><idno type="DOI">10.1029/2008GL034005</idno><idno type="ArticleID">2008GL034005</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0094-8276</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">A model study has been conducted of the unprecedented retreat of arctic sea ice in the summer of 2007. It is found that preconditioning, anomalous winds, and ice‐albedo feedback are mainly responsible for the retreat. Arctic sea ice in 2007 was preconditioned to radical changes after years of shrinking and thinning in a warm climate. During summer 2007 atmospheric changes strengthened the transpolar drift of sea ice, causing more ice to move out of the Pacific sector and the central Arctic Ocean where the reduction in ice thickness due to ice advection is up to 1.5 m more than usual. Some of the ice exited Fram Strait and some piled up in part of the Canada Basin and along the coast of northern Greenland, leaving behind an unusually large area of thin ice and open water. Thin ice and open water allow more surface solar heating because of a much reduced surface albedo, leading to amplified ice melting. The Arctic Ocean lost additional 10% of its total ice mass in which 70% is due directly to the amplified melting and 30% to the unusual ice advection, causing the unprecedented ice retreat. Arctic sea ice has entered a state of being particularly vulnerable to anomalous atmospheric forcing.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country><region><li>Washington (État)</li></region><settlement><li>Seattle</li></settlement><orgName><li>Université de Washington</li></orgName></list><tree><country name="États-Unis"><region name="Washington (État)"><name sortKey="Zhang, Jinlun" sort="Zhang, Jinlun" uniqKey="Zhang J" first="Jinlun" last="Zhang">Jinlun Zhang</name></region><name sortKey="Lindsay, Ron" sort="Lindsay, Ron" uniqKey="Lindsay R" first="Ron" last="Lindsay">Ron Lindsay</name><name sortKey="Schweiger, Axel" sort="Schweiger, Axel" uniqKey="Schweiger A" first="Axel" last="Schweiger">Axel Schweiger</name><name sortKey="Steele, Mike" sort="Steele, Mike" uniqKey="Steele M" first="Mike" last="Steele">Mike Steele</name><name sortKey="Zhang, Jinlun" sort="Zhang, Jinlun" uniqKey="Zhang J" first="Jinlun" last="Zhang">Jinlun Zhang</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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