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|a Stronger ocean circulation and increased melting under Pine Island Glacier ice shelf |h [electronic resource] |y English. |
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|a [S.l.] : |b Macmillan Publishers Limited, |c 2011. |
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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 In 1994, ocean measurements near Antarctica’s Pine Island
Glacier showed that the ice shelf buttressing the glacier
was melting rapidly1. This melting was attributed to the
presence of relatively warm, deep water on the Amundsen
Sea continental shelf. Heat, salt and ice budgets along with
ocean modelling provided steady-state calving and melting
rates2,3. Subsequent satellite observations and modelling have
indicated large system imbalances, including ice-shelf thinning
and more intense melting, glacier acceleration and drainage
basin drawdown4–10. Here we combine our earlier data with
measurements taken in 2009 to show that the temperature
and volume of deep water in Pine Island Bay have increased.
Ocean transport and tracer calculations near the ice shelf
reveal a rise in meltwater production by about 50% since
1994. The faster melting seems to result mainly from stronger
sub-ice-shelf circulation, as thinning ice has increased the gap
above an underlying submarine bank on which the glacier was
formerly grounded11. We conclude that the basal melting has
exceeded the increase in ice inflow, leading to the formation
and enlargement of an inner cavity under the ice shelf within
which sea water nearly 4 degree celsius above freezing can now more
readily access the grounding zone. |
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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 dpSobek |c Sea Level Rise |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15062131/00001 |y Click here for full text |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/06/21/31/00001/FI15062131_thm.jpg |
