DOI: 10.5194/tc-7-1007-2013
Scopus记录号: 2-s2.0-84880813867
论文题名: High sensitivity of tidewater outlet glacier dynamics to shape
作者: Enderlin E ; M ; , Howat I ; M ; , Vieli A
刊名: Cryosphere
ISSN: 19940416
出版年: 2013
卷: 7, 期: 3 起始页码: 1007
结束页码: 1015
语种: 英语
英文关键词: discharge
; elevation
; flow modeling
; glacier dynamics
; glacier retreat
; ice flow
; ice thickness
; shape
; tidewater glacier
; topographic effect
; uncertainty analysis
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). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74975
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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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
Recommended Citation:
Enderlin E,M,, Howat I,et al. High sensitivity of tidewater outlet glacier dynamics to shape[J]. Cryosphere,2013-01-01,7(3)