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|a Diverse calving patterns linked to glacier geometry |h [electronic resource]. |
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|a [S.l.] : |b Macmillan Publishers Limited, |c 2013. |
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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 Iceberg calving has been implicated in the retreat and
acceleration of glaciers and ice shelves along the margins of
the Greenland and Antarctic ice sheets1–4. Accurate projections
of sea-level rise therefore require an understanding of
how and why calving occurs. Unfortunately, calving is a
complex process and previous models of the phenomenon
have not reproduced the diverse patterns of iceberg calving
observed in nature5,6. Here we present a numerical model that
simulates the disparate calving regimes observed, including
the detachment of large tabular bergs from floating ice
tongues, the disintegration of ice shelves and the capsizing
of smaller bergs from grounded glaciers that terminate in
deep water. Our model treats glacier ice as a granular
material made of interacting boulders of ice that are bonded
together. Simulations suggest that different calving regimes
are controlled by glacier geometry, which controls the stress
state within the glacier. We also find that calving is a twostage
process that requires both ice fracture and transport of
detached icebergs away from the calving front. We suggest
that, as a result, rapid iceberg discharge is possible in
regions where highly crevassed glaciers are grounded deep
beneath sea level, indicating portions of Greenland and
Antarctica that may be vulnerable to rapid ice loss through
catastrophic disintegration. |
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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 Diverse calving patterns linked to glacier geometry |
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|a dpSobek |c Sea Level Rise |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15062165/00001 |y Click here for full text |
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|3 FULL TEXT |u http://www.nature.com/ngeo/journal/v6/n10/full/ngeo1887.html |y Diverse calving patterns linked to glacier geometry |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/06/21/65/00001/FI15062165thm.jpg |
