| DOI: | 10.1002/grl.50137
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| 论文题名: | Detecting unfrozen sediments below thermokarst lakes with surface nuclear magnetic resonance |
| 作者: | Parsekian A.D.; Grosse G.; Walbrecker J.O.; Müller-Petke M.; Keating K.; Liu L.; Jones B.M.; Knight R.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9332
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| EISSN: | 1944-9063
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| 出版年: | 2013
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| 卷: | 40, 期:3 | | 起始页码: | 535
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| 结束页码: | 540
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| 语种: | 英语
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| 英文关键词: | surface NMR
; thermokarst lake
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| Scopus关键词: | Groundwater
; Methane
; Nuclear magnetic resonance
; Permafrost
; Geophysical methods
; Hydrochemical conditions
; Large-scale studies
; Nuclear magnetic resonance(NMR)
; Surface NMR
; Surface water and groundwaters
; Thermokarst lakes
; Unfrozen water contents
; Lakes
; carbon cycle
; cryosphere
; methane
; nuclear magnetic resonance
; permafrost
; talik
; thermokarst
; water content
; Alaska
; Fairbanks
; United States
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| 英文摘要: | A talik is a layer or body of unfrozen ground that occurs in permafrost due to an anomaly in thermal, hydrological, or hydrochemical conditions. Information about talik geometry is important for understanding regional surface water and groundwater interactions as well as sublacustrine methane production in thermokarst lakes. Due to the direct measurement of unfrozen water content, surface nuclear magnetic resonance (NMR) is a promising geophysical method for noninvasively estimating talik dimensions. We made surface NMR measurements on thermokarst lakes and terrestrial permafrost near Fairbanks, Alaska, and confirmed our results using limited direct measurements. At an 8 m deep lake, we observed thaw bulb at least 22 m below the surface; at a 1.4 m deep lake, we detected a talik extending between 5 and 6 m below the surface. Our study demonstrates the value that surface NMR may have in the cryosphere for studies of thermokarst lake hydrology and their related role in the carbon cycle. Key points Surface NMR for estimating talik thickness is demonstrated Strong potential for surface NMR to support and constrain large-scale studies ©2013. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84878165843&doi=10.1002%2fgrl.50137&partnerID=40&md5=40d6cf15d0e60f6cf9603c8cd71728c3
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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/6596
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Department of Geophysics, Stanford University, Stanford, CA, United States
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| Recommended Citation: | |
Parsekian A.D.,Grosse G.,Walbrecker J.O.,et al. Detecting unfrozen sediments below thermokarst lakes with surface nuclear magnetic resonance[J]. Geophysical Research Letters,2013-01-01,40(3).
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