Ground surface temperature reconstructions: Using in situ estimates for thermal conductivity acquired with a fiber-optic distributed thermal perturbation sensor
We have developed a borehole methodology to estimate formation thermal conductivity in situ with a spatial resolution of one meter. In parallel with a fiber-optic distributed temperature sensor (DTS), a resistance heater is deployed to create a controlled thermal perturbation. The transient thermal...
Published in: | Geophysical Research Letters |
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Online Access: | http://www.osti.gov/servlets/purl/951790 https://www.osti.gov/biblio/951790 https://doi.org/10.1029/2008GL034762 |
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ftosti:oai:osti.gov:951790 2023-07-30T04:05:56+02:00 Ground surface temperature reconstructions: Using in situ estimates for thermal conductivity acquired with a fiber-optic distributed thermal perturbation sensor Freifeld, B.M. Finsterle, S. Onstott, T.C. Toole, P. Pratt, L.M. 2009-12-16 application/pdf http://www.osti.gov/servlets/purl/951790 https://www.osti.gov/biblio/951790 https://doi.org/10.1029/2008GL034762 unknown http://www.osti.gov/servlets/purl/951790 https://www.osti.gov/biblio/951790 https://doi.org/10.1029/2008GL034762 doi:10.1029/2008GL034762 54 58 BOREHOLES HEATERS PERMAFROST SPATIAL RESOLUTION THERMAL CONDUCTIVITY TRANSIENTS 2009 ftosti https://doi.org/10.1029/2008GL034762 2023-07-11T08:47:03Z We have developed a borehole methodology to estimate formation thermal conductivity in situ with a spatial resolution of one meter. In parallel with a fiber-optic distributed temperature sensor (DTS), a resistance heater is deployed to create a controlled thermal perturbation. The transient thermal data is inverted to estimate the formation's thermal conductivity. We refer to this instrumentation as a Distributed Thermal Perturbation Sensor (DTPS), given the distributed nature of the DTS measurement technology. The DTPS was deployed in permafrost at the High Lake Project Site (67 degrees 22 minutes N, 110 degrees 50 minutes W), Nunavut, Canada. Based on DTPS data, a thermal conductivity profile was estimated along the length of a wellbore. Using the thermal conductivity profile, the baseline geothermal profile was then inverted to estimate a ground surface temperature history (GSTH) for the High Lake region. The GSTH exhibits a 100-year long warming trend, with a present-day ground surface temperature increase of 3.0 {+-} 0.8 C over the long-term average. Other/Unknown Material Nunavut permafrost SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Nunavut Canada High Lake ENVELOPE(-110.849,-110.849,67.386,67.386) Geophysical Research Letters 35 14 |
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Open Polar |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
54 58 BOREHOLES HEATERS PERMAFROST SPATIAL RESOLUTION THERMAL CONDUCTIVITY TRANSIENTS |
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54 58 BOREHOLES HEATERS PERMAFROST SPATIAL RESOLUTION THERMAL CONDUCTIVITY TRANSIENTS Freifeld, B.M. Finsterle, S. Onstott, T.C. Toole, P. Pratt, L.M. Ground surface temperature reconstructions: Using in situ estimates for thermal conductivity acquired with a fiber-optic distributed thermal perturbation sensor |
topic_facet |
54 58 BOREHOLES HEATERS PERMAFROST SPATIAL RESOLUTION THERMAL CONDUCTIVITY TRANSIENTS |
description |
We have developed a borehole methodology to estimate formation thermal conductivity in situ with a spatial resolution of one meter. In parallel with a fiber-optic distributed temperature sensor (DTS), a resistance heater is deployed to create a controlled thermal perturbation. The transient thermal data is inverted to estimate the formation's thermal conductivity. We refer to this instrumentation as a Distributed Thermal Perturbation Sensor (DTPS), given the distributed nature of the DTS measurement technology. The DTPS was deployed in permafrost at the High Lake Project Site (67 degrees 22 minutes N, 110 degrees 50 minutes W), Nunavut, Canada. Based on DTPS data, a thermal conductivity profile was estimated along the length of a wellbore. Using the thermal conductivity profile, the baseline geothermal profile was then inverted to estimate a ground surface temperature history (GSTH) for the High Lake region. The GSTH exhibits a 100-year long warming trend, with a present-day ground surface temperature increase of 3.0 {+-} 0.8 C over the long-term average. |
author |
Freifeld, B.M. Finsterle, S. Onstott, T.C. Toole, P. Pratt, L.M. |
author_facet |
Freifeld, B.M. Finsterle, S. Onstott, T.C. Toole, P. Pratt, L.M. |
author_sort |
Freifeld, B.M. |
title |
Ground surface temperature reconstructions: Using in situ estimates for thermal conductivity acquired with a fiber-optic distributed thermal perturbation sensor |
title_short |
Ground surface temperature reconstructions: Using in situ estimates for thermal conductivity acquired with a fiber-optic distributed thermal perturbation sensor |
title_full |
Ground surface temperature reconstructions: Using in situ estimates for thermal conductivity acquired with a fiber-optic distributed thermal perturbation sensor |
title_fullStr |
Ground surface temperature reconstructions: Using in situ estimates for thermal conductivity acquired with a fiber-optic distributed thermal perturbation sensor |
title_full_unstemmed |
Ground surface temperature reconstructions: Using in situ estimates for thermal conductivity acquired with a fiber-optic distributed thermal perturbation sensor |
title_sort |
ground surface temperature reconstructions: using in situ estimates for thermal conductivity acquired with a fiber-optic distributed thermal perturbation sensor |
publishDate |
2009 |
url |
http://www.osti.gov/servlets/purl/951790 https://www.osti.gov/biblio/951790 https://doi.org/10.1029/2008GL034762 |
long_lat |
ENVELOPE(-110.849,-110.849,67.386,67.386) |
geographic |
Nunavut Canada High Lake |
geographic_facet |
Nunavut Canada High Lake |
genre |
Nunavut permafrost |
genre_facet |
Nunavut permafrost |
op_relation |
http://www.osti.gov/servlets/purl/951790 https://www.osti.gov/biblio/951790 https://doi.org/10.1029/2008GL034762 doi:10.1029/2008GL034762 |
op_doi |
https://doi.org/10.1029/2008GL034762 |
container_title |
Geophysical Research Letters |
container_volume |
35 |
container_issue |
14 |
_version_ |
1772818255268806656 |