气候变化领域集成服务门户(CCPortal): A confined-unconfined aquifer model for subglacial hydrology and its application to the Northeast Greenland Ice Stream

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DOI	10.5194/tc-12-3931-2018
	A confined-unconfined aquifer model for subglacial hydrology and its application to the Northeast Greenland Ice Stream
	Beyer S.; Kleiner T.; Aizinger V.; Rückamp M.; Humbert A.
发表日期	2018
ISSN	19940416
卷号	12 期号:12
英文摘要	Subglacial hydrology plays an important role in ice sheet dynamics as it determines the sliding velocity. It also drives freshwater into the ocean, leading to undercutting of calving fronts by plumes. Modeling subglacial water has been a challenge for decades. Only recently have new approaches been developed such as representing subglacial channels and thin water sheets by separate layers of variable hydraulic conductivity. We extend this concept by modeling a confined-unconfined aquifer system (CUAS) in a single layer of an equivalent porous medium (EPM). The advantage of this formulation is that it prevents unphysical values of pressure at reasonable computational cost. We performed sensitivity tests to investigate the effect of different model parameters. The strongest influence of model parameters was detected in terms of governing the opening and closure of the system. Furthermore, we applied the model to the Northeast Greenland Ice Stream, where an efficient system independent of seasonal input was identified about 500 km downstream from the ice divide. Using the effective pressure from the hydrology model, the Ice Sheet System Model (ISSM) showed considerable improvements in modeled velocities in the coastal region. © 2018 Author(s).
学科领域	caving; coastal zone; confined aquifer; flow modeling; flow velocity; glacial hydrology; hydrological modeling; subglacial environment; unconfined aquifer; Arctic; Greenland; Greenland Ice Sheet
语种	英语
scopus关键词	caving; coastal zone; confined aquifer; flow modeling; flow velocity; glacial hydrology; hydrological modeling; subglacial environment; unconfined aquifer; 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/119011
作者单位	Potsdam Institute for Climate Impact Research (PIK), Leibniz Association, P.O. Box 60 12 03, Potsdam, 14412, Germany; Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany; Department of Mathematics, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany; Faculty of Geosciences, University of Bremen, Bremen, Germany
推荐引用方式 GB/T 7714	Beyer S.,Kleiner T.,Aizinger V.,et al. A confined-unconfined aquifer model for subglacial hydrology and its application to the Northeast Greenland Ice Stream[J],2018,12(12).
APA	Beyer S.,Kleiner T.,Aizinger V.,Rückamp M.,&Humbert A..(2018).A confined-unconfined aquifer model for subglacial hydrology and its application to the Northeast Greenland Ice Stream.Cryosphere,12(12).
MLA	Beyer S.,et al."A confined-unconfined aquifer model for subglacial hydrology and its application to the Northeast Greenland Ice Stream".Cryosphere 12.12(2018).