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Modeling Antarctic Subglacial Lake Filling and Drainage CyclesThe 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.
Document ID
20160009149
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Dow, Christine F. (Oak Ridge Associated Universities Greenbelt, MD, United States)
Werder, Mauro A. (Eidgenoessische Technische Hochschule Zurich, Switzerland)
Nowicki, Sophie (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Walker, Ryan T. (Maryland Univ. College Park, MD, United States)
Date Acquired
July 19, 2016
Publication Date
July 8, 2016
Publication Information
Publication: The Cryosphere
Volume: 10
Issue: 4
Subject Category
Earth Resources and Remote Sensing
Report/Patent Number
GSFC-E-DAA-TN33846
Funding Number(s)
CONTRACT_GRANT: NNX12AD03A
Distribution Limits
Public
Copyright
Other
Keywords
drainage
Modeling
subglacial