Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1190/GEO2015-0186.1 |
Helicopter-borne transient electromagnetics in high-latitude environments: An application in the McMurdo Dry Valleys, Antarctica | |
Foley, Neil1; Tulaczyk, Slawek1; Auken, Esben2; Schamper, Cyril3; Dugan, Hilary4; Mikucki, Jill5; Virginia, Ross6; Doran, Peter7 | |
通讯作者 | Foley, Neil |
来源期刊 | GEOPHYSICS
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ISSN | 0016-8033 |
EISSN | 1942-2156 |
出版年 | 2016 |
卷号 | 81期号:1页码:WA87-WA99 |
英文摘要 | The McMurdo Dry Valleys are a polar desert in coastal Antarctica, where glaciers, permafrost, ice-covered lakes, and ephemeral summer streams coexist. Liquid water is found at the surface only in lakes and in the temporary streams that feed them. Past geophysical exploration has yielded ambiguous results regarding the presence of subsurface water. In 2011, we used a helicopter-borne, time-domain electromagnetic (TDEM) sensor to map resistivity in the subsurface across the Dry Valleys. The airborne electromagnetic (AEM) method excels at finding subsurface liquid water in polar deserts, where water remains liquid under cold conditions if it is sufficiently saline, and therefore electrically conductive. Over the course of 26 h of helicopter time, we covered large portions of the Dry Valleys and vastly increased our geophysical understanding of the subsurface, particularly with respect to water. Our data show extensive subsurface low-resistivity layers approximately 150-250 m below the surface and beneath higher resistivity layers. We interpret the low-resistivity layers as geologic materials containing freeze-concentrated or "cryoconcentrated" hyper saline brines lying beneath glaciers and frozen permafrost. These brines appeared to be contiguous with surface lakes, subglacial regions, and the Ross Sea, which could indicate a regional-hydrogeologic system, wherein solutes might be transported between surface reservoirs by ionic diffusion and subsurface flow. The presence of such brines underneath glaciers-might have implications for glacier movement. Systems such as this, where brines exist beneath glacial ice and frozen permafrost, may exist elsewhere in coastal Antarctica; AEM resistivity is an ideal tool to find and survey them. Our application of TDEM demonstrates that in polar subsurface environments containing conductive brines, such a diffusive electromagnetic method is superior to radar surveying in terms of depth of penetration and ability to differentiate hydrogeologic conditions. |
类型 | Article |
语种 | 英语 |
国家 | USA ; Denmark ; France |
收录类别 | SCI-E |
WOS记录号 | WOS:000377880100047 |
WOS关键词 | GROUND-PENETRATING RADAR ; SPATIALLY CONSTRAINED INVERSION ; JAMES-ROSS-ISLAND ; ICE-SHEET ; TAYLOR VALLEY ; AIRBORNE ELECTROMAGNETICS ; SALINITY DISTRIBUTION ; CLIMATE-CHANGE ; ROCK GLACIERS ; LAKE |
WOS类目 | Geochemistry & Geophysics |
WOS研究方向 | Geochemistry & Geophysics |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/193280 |
作者单位 | 1.Univ Calif Santa Cruz, Earth & Planetary Sci, Santa Cruz, CA 95064 USA; 2.Aarhus Univ, Dept Geosci, Aarhus, Denmark; 3.Univ Paris 06, Sorbonne Univ, UMR METIS 7619, Paris, France; 4.Univ Wisconsin, Ctr Limnol, Madison, WI 53706 USA; 5.Middlebury Coll, Dept Biol, Middlebury, VT 05753 USA; 6.Dartmouth Coll, Environm Studies Program, Hanover, NH 03755 USA; 7.Louisiana State Univ, Dept Geol & Geophys, Baton Rouge, LA 70803 USA |
推荐引用方式 GB/T 7714 | Foley, Neil,Tulaczyk, Slawek,Auken, Esben,et al. Helicopter-borne transient electromagnetics in high-latitude environments: An application in the McMurdo Dry Valleys, Antarctica[J],2016,81(1):WA87-WA99. |
APA | Foley, Neil.,Tulaczyk, Slawek.,Auken, Esben.,Schamper, Cyril.,Dugan, Hilary.,...&Doran, Peter.(2016).Helicopter-borne transient electromagnetics in high-latitude environments: An application in the McMurdo Dry Valleys, Antarctica.GEOPHYSICS,81(1),WA87-WA99. |
MLA | Foley, Neil,et al."Helicopter-borne transient electromagnetics in high-latitude environments: An application in the McMurdo Dry Valleys, Antarctica".GEOPHYSICS 81.1(2016):WA87-WA99. |
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