Connections among ice, runoff and atmospheric forcing in the Beaufort Gyre
Identifieur interne : 003768 ( Main/Exploration ); précédent : 003767; suivant : 003769Connections among ice, runoff and atmospheric forcing in the Beaufort Gyre
Auteurs : R. W. Macdonald [Canada] ; E. C. Carmack [Canada] ; F. A. Mclaughlin [Canada] ; K. K. Falkner [États-Unis] ; J. H. Swift [États-Unis]Source :
- Geophysical Research Letters [ 0094-8276 ] ; 1999-08-01.
Abstract
During SHEBA, thin ice and freshening of the Arctic Ocean surface in the Beaufort Sea led to speculation that perennial sea ice was disappearing [McPhee et al., 1998]. Since 1987, we have collected salinity, δ18O and Ba profiles near the initial SHEBA site and, in 1997, we ran a section out to SHEBA. Resolving fresh water into runoff and ice melt, we found a large background of Mackenzie River water with exceptional amounts in 1997 explaining much of the freshening at SHEBA. Ice melt went through a dramatic 4–6 m jump in the early 1990s coinciding with the atmospheric pressure field and sea‐ice circulation becoming more cyclonic. The increase in sea‐ice melt appears to be a thermal and mechanical response to a circulation regime shift. Should atmospheric circulation revert to the more anticyclonic mode, ice conditions can also be expected to revert although not necessarily to previous conditions.
Url:
DOI: 10.1029/1999GL900508
Affiliations:
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Lett.</title><idno type="ISSN">0094-8276</idno><idno type="eISSN">1944-8007</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><date type="published" when="1999-08-01">1999-08-01</date><biblScope unit="volume">26</biblScope><biblScope unit="issue">15</biblScope><biblScope unit="page" from="2223">2223</biblScope><biblScope unit="page" to="2226">2226</biblScope></imprint><idno type="ISSN">0094-8276</idno></series><idno type="istex">67FCC214C9A0128FE178011343EE59FEB6A8D64E</idno><idno type="DOI">10.1029/1999GL900508</idno><idno type="ArticleID">1999GL900508</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">During SHEBA, thin ice and freshening of the Arctic Ocean surface in the Beaufort Sea led to speculation that perennial sea ice was disappearing [McPhee et al., 1998]. Since 1987, we have collected salinity, δ18O and Ba profiles near the initial SHEBA site and, in 1997, we ran a section out to SHEBA. Resolving fresh water into runoff and ice melt, we found a large background of Mackenzie River water with exceptional amounts in 1997 explaining much of the freshening at SHEBA. Ice melt went through a dramatic 4–6 m jump in the early 1990s coinciding with the atmospheric pressure field and sea‐ice circulation becoming more cyclonic. The increase in sea‐ice melt appears to be a thermal and mechanical response to a circulation regime shift. 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Falkner</name></region><name sortKey="Swift, J H" sort="Swift, J H" uniqKey="Swift J" first="J. H." last="Swift">J. H. Swift</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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