globalchange  > 影响、适应和脆弱性
DOI: 10.5194/tc-7-1185-2013
Scopus记录号: 2-s2.0-84887389239
论文题名:
Influence of ice-sheet geometry and supraglacial lakes on seasonal ice-flow variability
作者: Joughin I; , Das S; B; , Flowers G; E; , Behn M; D; , Alley R; B; , King M; A; , Smith B; E; , Bamber J; L; , Van Den Broeke M; R; , Van Angelen J; H
刊名: Cryosphere
ISSN: 19940416
出版年: 2013
卷: 7, 期:4
起始页码: 1185
结束页码: 1192
语种: 英语
英文关键词: data set ; drainage ; geometry ; glacial environment ; ice flow ; ice sheet ; meltwater ; observational method ; topography ; velocity ; water flow ; Arctic ; Greenland ; Greenland Ice Sheet
英文摘要: Supraglacial lakes play an important role in establishing hydrological connections that allow lubricating seasonal meltwater to reach the base of the Greenland Ice Sheet. Here we use new surface velocity observations to examine the influence of supraglacial lake drainages and surface melt rate on ice flow. We find large, spatially extensive speedups concurrent with times of lake drainage, showing that lakes play a key role in modulating regional ice flow. While surface meltwater is supplied to the bed via a geographically sparse network of moulins, the observed ice-flow enhancement suggests that this meltwater spreads widely over the ice-sheet bed. We also find that the complex spatial pattern of speedup is strongly determined by the combined influence of bed and surface topography on subglacial water flow. Thus, modeling of ice-sheet basal hydrology likely will require knowledge of bed topography resolved at scales (sub-kilometer) far finer than existing data (several km). © Author(s) 2013.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74928
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: Polar Science Center, Applied Physics Lab., University of Washington, 1013 NE 40th St., Seattle, WA 98105-6698, United States; Department of Geology and Geophysics, Woods Hole Oceanographic Institute, Woods Hole, MA 02543, United States; Department of Earth Sciences, Simon Fraser University, 8888 University Drive, Burnaby, BC V5A 1S6, Canada; Department of Geosciences, Earth and Environmental Systems Institute, Pennsylvania State University, University Park, PA 16802, United States; School of Geography and Environmental Studies, University of Tasmania, Private Bag 76, Hobart, TAS 7001, Australia; School of Civil Engineering and Geoscience, Newcastle University, Newcastle upon Tyne, NE1 7RU, United Kingdom; Bristol Glaciology Centre, School of Geographical Sciences, University of Bristol, University Road, Bristol, BS8 1SS, United Kingdom; Institute for Marine and Atmospheric Research, Utrecht University, 3584 CC Utrecht, Netherlands

Recommended Citation:
Joughin I,, Das S,B,et al. Influence of ice-sheet geometry and supraglacial lakes on seasonal ice-flow variability[J]. Cryosphere,2013-01-01,7(4)
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