气候变化领域集成服务门户(CCPortal): Modeling Antarctic subglacial lake filling and drainage cycles

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DOI	10.5194/tc-10-1381-2016
	Modeling Antarctic subglacial lake filling and drainage cycles
	Dow C.F.; Werder M.A.; Nowicki S.; Walker R.T.
发表日期	2016
ISSN	19940416
卷号	10 期号:4
英文摘要	The growth and drainage of active subglacial lakes in Antarctica has previously been inferred from analysis of ice surface altimetry data. We use a subglacial hydrology model applied to a synthetic Antarctic ice stream to examine internal controls on the filling and drainage of subglacial lakes. Our model outputs suggest that the highly constricted subglacial environment of our idealized ice stream, combined with relatively high rates of water flow funneled from a large catchment, can combine to create a system exhibiting slow-moving pressure waves. Over a period of years, the accumulation of water in the ice stream onset region results in a buildup of pressure creating temporary channels, which then evacuate the excess water. This increased flux of water beneath the ice stream drives lake growth. As the water body builds up, it steepens the hydraulic gradient out of the overdeepened lake basin and allows greater flux. Eventually this flux is large enough to melt channels that cause the lake to drain. Lake drainage also depends on the internal hydrological development in the wider system and therefore does not directly correspond to a particular water volume or depth. This creates a highly temporally and spatially variable system, which is of interest for assessing the importance of subglacial lakes in ice stream hydrology and dynamics. © Author(s) 2016.
学科领域	drainage water; glacial lake; hydrological modeling; ice sheet; ice stream; lake level; spatial variation; subglacial environment; water depth; water flow; Antarctica
语种	英语
scopus关键词	drainage water; glacial lake; hydrological modeling; ice sheet; ice stream; lake level; spatial variation; subglacial environment; water depth; water flow; Antarctica
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/119624
作者单位	Cryospheric Sciences Laboratory, NASA, Goddard Space Flight Center, Greenbelt, MD, United States; Laboratory of Hydraulics, Hydrology and Glaciology (VAW), ETH Zurich, Zurich, Switzerland; Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD, United States; Department of Geography and Environmental Management, University of Waterloo, Waterloo, ON, Canada
推荐引用方式 GB/T 7714	Dow C.F.,Werder M.A.,Nowicki S.,et al. Modeling Antarctic subglacial lake filling and drainage cycles[J],2016,10(4).
APA	Dow C.F.,Werder M.A.,Nowicki S.,&Walker R.T..(2016).Modeling Antarctic subglacial lake filling and drainage cycles.Cryosphere,10(4).
MLA	Dow C.F.,et al."Modeling Antarctic subglacial lake filling and drainage cycles".Cryosphere 10.4(2016).