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|a Steep reverse bed slope at the grounding line of the Weddell Sea sector in West Antarctica |h [electronic resource] |y English. |
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|a [S.l.] : |b Macmillan Publishers Limited, |c 2012. |
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|a Nature Geoscience |y English. |
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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 The bed of the West Antarctic Ice Sheet is, in places, more
than 1.5 km below sea level. It has been suggested that
a positive ice-loss feedback may occur when an ice sheet’s
grounding line retreats across a deepening bed. Applied to
the West Antarctic Ice Sheet, this process could potentially
raise global sea level4 by more than 3 m. Hitherto, attention has
focussed on changes at the Siple Coast and Amundsen Sea
embayment sectors of West Antarctica. Here, we present
radio-echo sounding information from the ice sheet’s third
sector, the Weddell Sea embayment, that reveals a large
subglacial basin immediately upstream of the grounding line.
The reverse bed slope is steep, with about 400 m of decline
over 40 km. The basin floor is smooth and flat, with little
small-scale topography that would delay retreat, indicating
that it has been covered with marine sediment and was
previously deglaciated. Upstream of the basin, well-defined
glacially carved fjords with bars at their mouths testify to the
position of a former ice margin about 200 km inland from the
present margin. Evidence so far suggests that theWeddell Sea
sector of the West Antarctic Ice Sheet has been stable, but in
the light of our data we propose that the region could be near a
physical threshold of substantial change. |
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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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|t Steep reverse bed slope at the grounding line of the Weddell Sea sector in West Antarctica |
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|a dpSobek |c Sea Level Rise |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15062086/00001 |y Click here for full text |
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|3 FULL TEXT- Steep reverse bed slope at the grounding line of the Weddell Sea sector in West Antarctica |u http://www.nature.com/ngeo/journal/v5/n6/full/ngeo1468.html |y Steep reverse bed slope at the grounding line of the Weddell Sea sector in West Antarctica |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/06/20/86/00001/FI15062086_thm.jpg |
