气候变化领域集成服务门户(CCPortal): Integrated Borehole; Radar; and Seismic Velocity Analysis Reveals Dynamic Spatial Variations Within a Firn Aquifer in Southeast Greenland

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DOI	10.1029/2020GL089335
	Integrated Borehole; Radar; and Seismic Velocity Analysis Reveals Dynamic Spatial Variations Within a Firn Aquifer in Southeast Greenland
	Killingbeck S.F.; Schmerr N.C.; Montgomery L.N.; Booth A.D.; Livermore P.W.; Guandique J.; Miller O.L.; Burdick S.; Forster R.R.; Koenig L.S.; Legchenko A.; Ligtenberg S.R.M.; Miège C.; Solomon D.K.; West L.J.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:18
英文摘要	Perennial water storage in firn aquifers has been observed within the lower percolation zone of the southeast Greenland ice sheet. Spatially distributed seismic and radar observations, made ~50 km upstream of the Helheim Glacier terminus, reveal spatial variations of seismic velocity within a firn aquifer. From 1.65 to 1.8 km elevation, shear-wave velocity (Vs) is 1,290 ± 180 m/s in the unsaturated firn, decreasing below the water table (~15 m depth) to 1,130 ± 250 m/s. Below 1.65 km elevation, Vs in the saturated firn is 1,270 ± 220 m/s. The compressional-to-shear velocity ratio decreases in the downstream saturated zone, from 2.30 ± 0.54 to 2.01 ± 0.46, closer to its value for pure ice (2.00). Consistent with colocated firn cores, these results imply an increasing concentration of ice in the downstream sites, reducing the porosity and storage potential of the firn likely caused by episodic melt and freeze during the evolution of the aquifer. ©2020. The Authors.
英文关键词	Aquifers; Hydrogeology; Ice; Radar; Rivers; Seismic waves; Seismology; Shear waves; Solvents; Spatial distribution; Velocity; Wave propagation; Radar observations; Seismic velocities; Seismic velocity analysis; Shear velocities; Shear wave velocity; Southeast Greenland; Spatial variations; Storage potential; Shear flow; aquifer; borehole geophysics; firn; integrated approach; radar; seismic velocity; spatial variation; Arctic; Greenland; Helheim Glacier
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/169689
作者单位	School of Earth and Environment, University of Leeds, Leeds, United Kingdom; Department of Geology, University of Maryland, College Park, MD, United States; Atmospheric and Oceanic Sciences Department, University of Colorado Boulder, Boulder, CO, United States; United States Geological Survey, Utah Water Science Center, West Valley City, UT, United States; Department of Geology, Wayne State University, Detroit, MI, United States; Department of Geography, University of Utah, Salt Lake City, UT, United States; National Snow and Ice Data Center, University of Colorado, Boulder, CO, United States; L'Institut des Géosciences de l'Environnement, IRD - Research Institute for Development, Marseille, France; Formerly Institute for Marine and Atmospheric Research Utrecht, Utrecht University, Utrecht, Netherlands; Formerly Department of Geography, Rutgers, The State University of New Jersey, New Brunswick, NJ, United States; Department of Geology and Geophysics, University of Utah, Salt Lake City, UT, United States
推荐引用方式 GB/T 7714	Killingbeck S.F.,Schmerr N.C.,Montgomery L.N.,et al. Integrated Borehole; Radar; and Seismic Velocity Analysis Reveals Dynamic Spatial Variations Within a Firn Aquifer in Southeast Greenland[J],2020,47(18).
APA	Killingbeck S.F..,Schmerr N.C..,Montgomery L.N..,Booth A.D..,Livermore P.W..,...&West L.J..(2020).Integrated Borehole; Radar; and Seismic Velocity Analysis Reveals Dynamic Spatial Variations Within a Firn Aquifer in Southeast Greenland.Geophysical Research Letters,47(18).
MLA	Killingbeck S.F.,et al."Integrated Borehole; Radar; and Seismic Velocity Analysis Reveals Dynamic Spatial Variations Within a Firn Aquifer in Southeast Greenland".Geophysical Research Letters 47.18(2020).