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|a Dynamics of the last glacial maximum Antarctic ice-sheet and its response to ocean forcing |h [electronic resource]. |
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|a [S.l.] : |b National Academy of Sciences, |c 2012-10-02. |
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|a Proceedings of the National Academy of Sciences Volume 109 Number 40. |
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|a Please contact the owning institution for licensing and permissions. It is the user's responsibility to ensure use does not violate any third party rights. |
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|a Retreat of the Last Glacial Maximum (LGM) Antarctic ice sheet
is thought to have been initiated by changes in ocean heat and
eustatic sea level propagated from the Northern Hemisphere (NH)
as northern ice sheets melted under rising atmospheric temperatures.
The extent to which spatial variability in ice dynamics may
have modulated the resultant pattern and timing of decay of the
Antarctic ice sheet has so far received little attention, however, despite
the growing recognition that dynamic effects account for a
sizeable proportion of mass-balance changes observed in modern
ice sheets. Here we use a 5-km resolution whole-continent numerical
ice-sheet model to assess whether differences in the mechanisms
governing ice sheet flow could account for discrepancies
between geochronological studies in different parts of the continent.
We first simulate the geometry and flow characteristics of an
equilibrium LGM ice sheet, using pan-Antarctic terrestrial and marine
geological data for constraint, then perturb the system with sea
level and ocean heat flux increases to investigate ice-sheet vulnerability.
Our results identify that fast-flowing glaciers in the eastern
Weddell Sea, the Amundsen Sea, central Ross Sea, and in the
Amery Trough respond most rapidly to ocean forcings, in agreement
with empirical data. Most significantly,we find that although
ocean warming and sea-level rise bring about mainly localized
glacier acceleration, concomitant drawdown of ice from neighboring
areas leads to widespread thinning of entire glacier catchments
—a discovery that has important ramifications for the dynamic
changes presently being observed in modern ice sheets. |
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|a Electronic reproduction. |c Florida International University, |d 2015. |f (dpSobek) |n Mode of access: World Wide Web. |n System requirements: Internet connectivity; Web browser software. |
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|a Golledge, Nicholas R.. |
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|a Fogwill, Christopher J.. |
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|a Mackintosh, Andrew N.. |
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|t Dynamics of the last glacial maximum Antarctic ice-sheet and its response to ocean forcing |
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|a dpSobek |c Sea Level Rise |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15062139/00001 |y Click here for full text |
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|3 FULL TEXT |u http://www.pnas.org/content/109/40/16052.abstract |y Dynamics of the last glacial maximum Antarctic ice-sheet and its response to ocean forcing |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/06/21/39/00001/FI15062139_thm.jpg |
