气候变化领域集成服务门户(CCPortal): High sensitivity of tidewater outlet glacier dynamics to shape

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DOI	10.5194/tc-7-1007-2013
	High sensitivity of tidewater outlet glacier dynamics to shape
	Enderlin E.M.; Howat I.M.; Vieli A.
发表日期	2013
ISSN	19940416
卷号	7 期号:3
英文摘要	Variability in tidewater outlet glacier behavior under similar external forcing has been attributed to differences in outlet shape (i.e., bed elevation and width), but this dependence has not been investigated in detail. Here we use a numerical ice flow model to show that the dynamics of tidewater outlet glaciers under external forcing are highly sensitive to width and bed topography. Our sensitivity tests indicate that for glaciers with similar discharge, the trunks of wider glaciers and those grounded over deeper basal depressions tend to be closer to flotation, so that less dynamically induced thinning results in rapid, unstable retreat following a perturbation. The lag time between the onset of the perturbation and unstable retreat varies with outlet shape, which may help explain intra-regional variability in tidewater outlet glacier behavior. Further, because the perturbation response is dependent on the thickness relative to flotation, varying the bed topography within the range of observational uncertainty can result in either stable or unstable retreat due to the same perturbation. Thus, extreme care must be taken when interpreting the future behavior of actual glacier systems using numerical ice flow models that are not accompanied by comprehensive sensitivity analyses. © 2013 Author(s).
学科领域	discharge; elevation; flow modeling; glacier dynamics; glacier retreat; ice flow; ice thickness; shape; tidewater glacier; topographic effect; uncertainty analysis
语种	英语
scopus关键词	discharge; elevation; flow modeling; glacier dynamics; glacier retreat; ice flow; ice thickness; shape; tidewater glacier; topographic effect; uncertainty analysis
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/120282
作者单位	Byrd Polar Research Center, Ohio State University, 1090 Carmack Road, Columbus, OH 43210-1002, United States; School of Earth Sciences, Ohio State University, 275 Mendenhall Laboratory, Columbus, OH 43210-1308, United States; Department of Geography, University of Zurich, Winterthurerstr. 190, 8057 Zurich, Switzerland
推荐引用方式 GB/T 7714	Enderlin E.M.,Howat I.M.,Vieli A.. High sensitivity of tidewater outlet glacier dynamics to shape[J],2013,7(3).
APA	Enderlin E.M.,Howat I.M.,&Vieli A..(2013).High sensitivity of tidewater outlet glacier dynamics to shape.Cryosphere,7(3).
MLA	Enderlin E.M.,et al."High sensitivity of tidewater outlet glacier dynamics to shape".Cryosphere 7.3(2013).