气候变化领域集成服务门户(CCPortal): Changing basal conditions during the speed-up of Jakobshavn Isbræ, Greenland

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DOI	10.5194/tc-7-1679-2013
	Changing basal conditions during the speed-up of Jakobshavn Isbræ, Greenland
	Habermann M.; Truffer M.; Maxwell D.
发表日期	2013
ISSN	19940416
卷号	7 期号:6
英文摘要	Ice-sheet outlet glaciers can undergo dynamic changes such as the rapid speed-up of Jakobshavn Isbræ following the disintegration of its floating ice tongue. These changes are associated with stress changes on the boundary of the ice mass. We invert for basal conditions from surface velocity data throughout a well-observed period of rapid change and evaluate parameterizations currently used in ice-sheet models. A Tikhonov inverse method with a shallow-shelf approximation forward model is used for diagnostic inversions for the years 1985, 2000, 2005, 2006 and 2008. Our ice-softness, model norm, and regularization parameter choices are justified using the data-model misfit metric and the L curve method. The sensitivity of the inversion results to these parameter choices is explored. We find a lowering of effective basal yield stress in the first 7 km upstream from the 2008 grounding line and no significant changes higher upstream. The temporal evolution in the fast flow area is in broad agreement with a Mohr-Coulomb parameterization of basal shear stress, but with a till friction angle much lower than has been measured for till samples. The lowering of effective basal yield stress is significant within the uncertainties of the inversion, but it cannot be ruled out that there are other significant contributors to the acceleration of the glacier. © 2013 Author(s). CC Attribution 3.0 License.
学科领域	acceleration; baseline conditions; glacier flow; ice sheet; parameterization; shear stress; stress change; uncertainty analysis; Arctic; Greenland; Jakobshavn Isbrae
语种	英语
scopus关键词	acceleration; baseline conditions; glacier flow; ice sheet; parameterization; shear stress; stress change; uncertainty analysis; Arctic; Greenland; Jakobshavn Isbrae
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/120326
作者单位	Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK 99775-7320, United States; Department of Mathematics and Statistics, University of Alaska Fairbanks, Fairbanks, AK 99775, United States
推荐引用方式 GB/T 7714	Habermann M.,Truffer M.,Maxwell D.. Changing basal conditions during the speed-up of Jakobshavn Isbræ, Greenland[J],2013,7(6).
APA	Habermann M.,Truffer M.,&Maxwell D..(2013).Changing basal conditions during the speed-up of Jakobshavn Isbræ, Greenland.Cryosphere,7(6).
MLA	Habermann M.,et al."Changing basal conditions during the speed-up of Jakobshavn Isbræ, Greenland".Cryosphere 7.6(2013).