Details
| Original language | English |
|---|---|
| Pages (from-to) | 535-540 |
| Number of pages | 6 |
| Journal | Geophysical research letters |
| Volume | 40 |
| Issue number | 3 |
| Publication status | Published - 16 Feb 2013 |
| Externally published | Yes |
Abstract
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
Keywords
- surface NMR, thermokarst lake
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geophysics
- Earth and Planetary Sciences(all)
- General Earth and Planetary Sciences
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In: Geophysical research letters, Vol. 40, No. 3, 16.02.2013, p. 535-540.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Detecting unfrozen sediments below thermokarst lakes with surface nuclear magnetic resonance
AU - Parsekian, Andrew D.
AU - Grosse, Guido
AU - Walbrecker, Jan O.
AU - Müller-Petke, Mike
AU - Keating, Kristina
AU - Liu, Lin
AU - Jones, Benjamin M.
AU - Knight, Rosemary
PY - 2013/2/16
Y1 - 2013/2/16
N2 - 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
AB - 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
KW - surface NMR
KW - thermokarst lake
UR - http://www.scopus.com/inward/record.url?scp=84878165843&partnerID=8YFLogxK
U2 - 10.1002/grl.50137
DO - 10.1002/grl.50137
M3 - Article
AN - SCOPUS:84878165843
VL - 40
SP - 535
EP - 540
JO - Geophysical research letters
JF - Geophysical research letters
SN - 0094-8276
IS - 3
ER -