文章基本信息

标题：Ice dynamics preceding catastrophic disintegration of the floating part of Jakobshavn Isbræ, Greenland
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作者：Jesse V. Johnson ; Paul R. Prescott ; Terence J. Hughes 等
期刊名称：Journal of Glaciology
印刷版ISSN：0022-1430
电子版ISSN：1727-5652
出版年度：2004
卷号：50
期号：171
页码：492-504
DOI：10.3189/172756504781829729
出版社：Cambridge University Press
摘要：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.