气候变化领域集成服务门户(CCPortal): Moulin Volumes Regulate Subglacial Water Pressure on the Greenland Ice Sheet

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DOI	10.1029/2020GL088901
	Moulin Volumes Regulate Subglacial Water Pressure on the Greenland Ice Sheet
	Covington M.D.; Gulley J.D.; Trunz C.; Mejia J.; Gadd W.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:20
英文摘要	Meltwater inputs to moulins regulate Greenland Ice Sheet sliding speeds by controlling water pressure in the most connected regions of the subglacial drainage system. While moulin storage capacities are a critical control on subglacial water pressure, few observations exist to constrain storage. Using direct observations inside moulins, we show that moulin cross-sectional areas can be at least 500 m2, far greater than is observed at the surface or assumed in models. Moulin water level measurements and numerical modeling reveal that diurnal variability in moulin water pressure is highly attenuated in moulins with large storage volumes (∼3% ice pressure), relative to moulins with smaller storage volumes (∼25% ice pressure). Because large variability in moulin water pressure is linked to processes that ultimately reduce ice sliding speeds, ice sliding speeds in areas drained by large moulins may be more sensitive to long-term increases in meltwater than areas drained by small moulins. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	Glaciers; Water levels; Connected region; Cross sectional area; Direct observations; Diurnal variability; Drainage systems; Greenland Ice Sheet; Storage capacity; Subglacial waters; Ice; cross section; diurnal variation; drainage network; ice sheet; measurement method; meltwater; numerical method; pressure; water level; water storage; Arctic; Greenland; Greenland Ice Sheet
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169547
作者单位	Department of Geosciences, University of Arkansas, Fayetteville, AR, United States; Department of Geosciences, University of South Florida, Tampa, FL, United States; Will Gadd Consulting, LLC, Canmore, BC, Canada
推荐引用方式 GB/T 7714	Covington M.D.,Gulley J.D.,Trunz C.,et al. Moulin Volumes Regulate Subglacial Water Pressure on the Greenland Ice Sheet[J],2020,47(20).
APA	Covington M.D.,Gulley J.D.,Trunz C.,Mejia J.,&Gadd W..(2020).Moulin Volumes Regulate Subglacial Water Pressure on the Greenland Ice Sheet.Geophysical Research Letters,47(20).
MLA	Covington M.D.,et al."Moulin Volumes Regulate Subglacial Water Pressure on the Greenland Ice Sheet".Geophysical Research Letters 47.20(2020).