globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1302828110
论文题名:
Evidence for a water system transition beneath thwaites glacier; West Antarctica
作者: Schroeder D.M.; Blankenship D.D.; Young D.A.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2013
卷: 110, 期:30
起始页码: 12225
结束页码: 12228
语种: 英语
英文关键词: Ice sheet stability ; Radio glaciology ; Subglacial hydrology
Scopus关键词: acceleration ; Antarctica ; article ; controlled study ; glacier ; phase transition ; priority journal ; shear stress ; telecommunication ; water supply
英文摘要: Thwaites Glacier is one of the largest, most rapidly changing glaciers on Earth, and its landward-sloping bed reaches the interior of the marine West Antarctic Ice Sheet, which impounds enough ice to yield meters of sea-level rise. Marine ice sheets with landward-sloping beds have a potentially unstable configuration in which acceleration can initiate or modulate grounding-line retreat and ice loss. Subglacial water has been observed and theorized to accelerate the flow of overlying ice dependent on whether it is hydrologically distributed or concentrated. However, the subglacial water systems of Thwaites Glacier and their control on ice flow have not been characterized by geophysical analysis. The only practical means of observing these water systems is airborne ice-penetrating radar, but existing radar analysis approaches cannot discriminate between their dynamically critical states. We use the angular distribution of energy in radar bed echoes to characterize both the extent and hydrologic state of subglacial water systems across Thwaites Glacier. We validate this approach with radar imaging, showing that substantial water volumes are ponding in a system of distributed canals upstream of a bedrock ridge that is breached and bordered by a system of concentrated channels. The transition between these systems occurs with increasing surface slope, melt-water flux, and basal shear stress. This indicates a feedback between the subglacial water system and overlying ice dynamics, which raises the possibility that subglacial water could trigger or facilitate a grounding-line retreat in Thwaites Glacier capable of spreading into the interior of the West Antarctic Ice Sheet.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162148
Appears in Collections:气候变化与战略

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作者单位: Schroeder, D.M., Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin, TX 78758, United States; Blankenship, D.D., Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin, TX 78758, United States; Young, D.A., Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin, TX 78758, United States

Recommended Citation:
Schroeder D.M.,Blankenship D.D.,Young D.A.. Evidence for a water system transition beneath thwaites glacier; West Antarctica[J]. Proceedings of the National Academy of Sciences of the United States of America,2013-01-01,110(30)
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