Ice dynamics preceding catastrophic disintegration of the floating part of Jakobshavn Isbræ, Greenland

The floating terminal of Jakobshavn Isbræ, the fastest Greenland ice stream, has disintegrated since 2002, resulting in a doubling of ice velocity and rapidly lowering inland ice elevations. Conditions prior to disintegration were modeled using control theory in a plane-stress solution, and the Miss...

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Vydáno v:Journal of glaciology Ročník 50; číslo 171; s. 492 - 504
Hlavní autoři: Johnson, Jesse V., Prescott, Paul R., Hughes, Terence J.
Médium: Journal Article
Jazyk:angličtina
Vydáno: Cambridge, UK Cambridge University Press 2004
International Glaciological Society
Témata:
Earth, ocean, space
Exact sciences and technology
External geophysics
Snow. Ice. Glaciers
Arctic region
Greenland
Greenland, Vestgroenland, Jakobshavns Isbrae
ice sheets
Stress distribution
Ice jam
Ice shelf
polar regions
ice caps
Ice break up
digital simulation
finite element analysis
Floating ice
Ice stream
ISSN:0022-1430, 1727-5652
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Shrnutí:The floating terminal of Jakobshavn Isbræ, the fastest Greenland ice stream, has disintegrated since 2002, resulting in a doubling of ice velocity and rapidly lowering inland ice elevations. Conditions prior to disintegration were modeled using control theory in a plane-stress solution, and the Missoula model of ice-shelf flow. Both approaches pointed to a mechanism that inhibits ice flow and that is not captured by either approach. Jamming of flow, an inherent property of granular materials passing through a constriction (Jakobshavn Isfjord), is postulated as the mechanism. Rapid disintegration of heavily crevassed floating ice accompanies break-up of the ice jam.
Bibliografie:ObjectType-Article-1
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ISSN:0022-1430
1727-5652
DOI:10.3189/172756504781829729