globalchange  > 气候变化与战略
DOI: 10.5194/tc-15-3279-2021
论文题名:
Geophysical constraints on the properties of a subglacial lake in northwest Greenland
作者: Maguire R.; Schmerr N.; Pettit E.; Riverman K.; Gardner C.; Dellagiustina D.N.; Avenson B.; Wagner N.; Marusiak A.G.; Habib N.; Broadbeck J.I.; Bray V.J.; Bailey S.H.
刊名: Cryosphere
ISSN: 19940416
出版年: 2021
卷: 15, 期:7
起始页码: 3279
结束页码: 3291
语种: 英语
英文关键词: assessment method ; geoaccumulation ; geothermal power ; ground penetrating radar ; lacustrine deposit ; salinity ; sampling ; seismic data ; seismic reflection ; subglacial environment ; topography ; Arctic ; Greenland
英文摘要: In this study, we report the results of an active-source seismology and ground-penetrating radar survey performed in northwestern Greenland at a site where the presence of a subglacial lake beneath the accumulation area has previously been proposed. Both seismic and radar results show a flat reflector approximately 830-845ĝ€¯m below the surface, with a seismic reflection coefficient of -0.43ĝ€¯±ĝ€¯0.17, which is consistent with the acoustic impedance contrast between a layer of water and glacial ice. Additionally, in the seismic data we observe an intermittent lake bottom reflection arriving between 14-20ĝ€¯ms after the lake top reflection, corresponding to a lake depth of approximately 10-15ĝ€¯m. A strong coda following the lake top and lake bottom reflections is consistent with a package of lake bottom sediments although its thickness and material properties are uncertain. Finally, we use these results to conduct a first-order assessment of the lake origins using a one-dimensional thermal model and hydropotential modeling based on published surface and bed topography. Using these analyses, we narrow the lake origin hypotheses to either anomalously high geothermal flux or hypersalinity due to local ancient evaporite. Because the origins are still unclear, this site provides an intriguing opportunity for the first in situ sampling of a subglacial lake in Greenland, which could better constrain mechanisms of subglacial lake formation, evolution, and relative importance to glacial hydrology. © Author(s) 2021.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164747
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作者单位: Department of Geology, University of Maryland, College Park, MD 20742, United States; Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM 87131, United States; College of Earth Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331-5503, United States; Courant Institute of Mathematical Sciences, New York University, New York, NY 10012, United States; Department of Geosciences, Utah State University, Logan, UT 84322-4505, United States; Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721-0092, United States; Silicon Audio Inc., Pflugerville, TX 78660, United States; Department of Geosciences, University of Alaska, Fairbanks, AK 99775, United States

Recommended Citation:
Maguire R.,Schmerr N.,Pettit E.,et al. Geophysical constraints on the properties of a subglacial lake in northwest Greenland[J]. Cryosphere,2021-01-01,15(7)
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