气候变化领域集成服务门户(CCPortal): Liquid water content in ice estimated through a full-depth ground radar profile and borehole measurements in western Greenland

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DOI	10.5194/tc-11-669-2017
	Liquid water content in ice estimated through a full-depth ground radar profile and borehole measurements in western Greenland
	Brown J.; Harper J.; Humphrey N.
发表日期	2017
ISSN	19940416
卷号	11 期号:1
英文摘要	Liquid water content (wetness) within glacier ice is known to strongly control ice viscosity and ice deformation processes. Little is known about wetness of ice on the outer flanks of the Greenland Ice Sheet, where a temperate layer of basal ice exists. This study integrates borehole and radar surveys collected in June 2012 to provide direct estimates of englacial ice wetness in the ablation zone of western Greenland. We estimate electromagnetic propagation velocity of the ice body by inverting reflection travel times from radar data. Our inversion is constrained by ice thickness measured in boreholes and by positioning of a temperate-cold ice boundary identified in boreholes. Electromagnetic propagation velocities are consistent with a depth-averaged wetness of ∼0.5-1.1 %. The inversion indicates that wetness within the ice varies from < 0.1 % in an upper cold layer to ∼2.9-4.6 % in a 130-150 m thick temperate layer located above the glacier bed. Such high wetness should yield high rates of shear strain, which need to be accounted for in glacial flow models that focus on the ablation zone of Greenland. This high wetness also needs to be accounted for when determining ice thickness from radar measurements. © 2017 Author(s).
学科领域	ablation; basal ice; borehole logging; deformation mechanism; electromagnetic survey; ice thickness; radar altimetry; viscosity; water content; Arctic; Greenland; Greenland Ice Sheet
语种	英语
scopus关键词	ablation; basal ice; borehole logging; deformation mechanism; electromagnetic survey; ice thickness; radar altimetry; viscosity; water content; 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/119428
作者单位	Aesir Consulting LLC, Missoula, Montana 59801, United States; Department of Geosciences, University of Montana, Missoula, Montana 59801, United States; Department of Geology and Geophysics, University of Wyoming, Laramie, Wyoming 82071, United States
推荐引用方式 GB/T 7714	Brown J.,Harper J.,Humphrey N.. Liquid water content in ice estimated through a full-depth ground radar profile and borehole measurements in western Greenland[J],2017,11(1).
APA	Brown J.,Harper J.,&Humphrey N..(2017).Liquid water content in ice estimated through a full-depth ground radar profile and borehole measurements in western Greenland.Cryosphere,11(1).
MLA	Brown J.,et al."Liquid water content in ice estimated through a full-depth ground radar profile and borehole measurements in western Greenland".Cryosphere 11.1(2017).