| DOI: | 10.1002/2014GL062431
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| 论文题名: | Subsurface imaging reveals a confined aquifer beneath an ice-sealed Antarctic lake |
| 作者: | Dugan H.A.; Doran P.T.; Tulaczyk S.; Mikucki J.A.; Arcone S.A.; Auken E.; Schamper C.; Virginia R.A.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9072
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| EISSN: | 1944-8803
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| 出版年: | 2015
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| 卷: | 42, 期:1 | | 起始页码: | 96
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| 结束页码: | 103
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| 语种: | 英语
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| 英文关键词: | Antarctica
; electromagnetic methods
; frozen ground
; groundwater hydrology
; lakes
; permafrost
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| Scopus关键词: | Aquifers
; Geological surveys
; Geology
; Ground penetrating radar systems
; Groundwater
; Groundwater resources
; Hydrographic surveys
; Liquids
; Permafrost
; Soils
; Surveys
; Antarctica
; Electromagnetic methods
; Frozen ground
; Ground penetrating radar survey
; Ground-water hydrology
; Microbial populations
; Sub-surface imaging
; Transient electromagnetics
; Lakes
; brine
; confined aquifer
; freezing
; geophysical survey
; ground penetrating radar
; microbial community
; ocean basin
; permafrost
; porosity
; Antarctica
; East Antarctica
; McMurdo Dry Valleys
; Southern Ocean
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| 英文摘要: | Liquid water oases are rare under extreme cold desert conditions found in the Antarctic McMurdo Dry Valleys. Here we report geophysical results that indicate that Lake Vida, one of the largest lakes in the region, is nearly frozen and underlain by widespread cryoconcentrated brine. A ground penetrating radar survey profiled 20 m into lake ice and facilitated bathymetric mapping of the upper lake basin. An airborne transient electromagnetic survey revealed a low-resistivity zone 30-100 m beneath the lake surface. Based on previous knowledge of brine chemistry and local geology, we interpret this zone to be a confined aquifer situated in sediments with a porosity of 23-42%. Discovery of this aquifer suggests that subsurface liquid water may be more pervasive in regions of continuous permafrost than previously thought and may represent an extensive habitat for microbial populations. Key Points Geophysical survey finds low resistivities beneath a lake in Antarctic Dry Valleys Liquid brine abundant beneath Antarctic lake Aquifer provides microbial refugium in cold desert environment ©2014. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84921857577&doi=10.1002%2f2014GL062431&partnerID=40&md5=185cc37fad7b2f3fd5b133102419b49a
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/8688
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| Appears in Collections: | 科学计划与规划
气候变化与战略
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作者单位: | Department of Earth and Environmental Sciences, University of Illinois at Chicago, Chicago, IL, United States
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| Recommended Citation: | |
Dugan H.A.,Doran P.T.,Tulaczyk S.,et al. Subsurface imaging reveals a confined aquifer beneath an ice-sealed Antarctic lake[J]. Geophysical Research Letters,2015-01-01,42(1).
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