气候变化领域集成服务门户(CCPortal): Influence of ice-sheet geometry and supraglacial lakes on seasonal ice-flow variability

CCPortal

DOI	10.5194/tc-7-1185-2013
	Influence of ice-sheet geometry and supraglacial lakes on seasonal ice-flow variability
	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.
发表日期	2013
ISSN	19940416
卷号	7 期号:4
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.
学科领域	data set; drainage; geometry; glacial environment; ice flow; ice sheet; meltwater; observational method; topography; velocity; water flow; Arctic; Greenland; Greenland Ice Sheet
语种	英语
scopus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
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/120238
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
推荐引用方式 GB/T 7714	Joughin I.,Das S.B.,Flowers G.E.,et al. Influence of ice-sheet geometry and supraglacial lakes on seasonal ice-flow variability[J],2013,7(4).
APA	Joughin I..,Das S.B..,Flowers G.E..,Behn M.D..,Alley R.B..,...&Van Angelen J.H..(2013).Influence of ice-sheet geometry and supraglacial lakes on seasonal ice-flow variability.Cryosphere,7(4).
MLA	Joughin I.,et al."Influence of ice-sheet geometry and supraglacial lakes on seasonal ice-flow variability".Cryosphere 7.4(2013).