DOI: 10.5194/tc-10-1381-2016
Scopus记录号: 2-s2.0-84978431909
论文题名: Modeling Antarctic subglacial lake filling and drainage cycles
作者: Dow C ; F ; , Werder M ; A ; , Nowicki S ; , Walker R ; T
刊名: Cryosphere
ISSN: 19940416
出版年: 2016
卷: 10, 期: 4 起始页码: 1381
结束页码: 1393
语种: 英语
英文关键词: drainage water
; glacial lake
; hydrological modeling
; ice sheet
; ice stream
; lake level
; spatial variation
; subglacial environment
; water depth
; water flow
; Antarctica
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75120
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: 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
Recommended Citation:
Dow C,F,, Werder M,et al. Modeling Antarctic subglacial lake filling and drainage cycles[J]. Cryosphere,2016-01-01,10(4)