Geothermal flux beneath the Antarctic Ice Sheet derived from measured temperature profiles in deep boreholes
The temperature at the Antarctic ice sheet bed and the temperature gradient in subglacial rocks have been directly measured only a few times, although extensive thermodynamic modelling has been used to estimate geothermal heat flux under ice sheet. During the last five decades, deep ice-core drillin...
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ftcopernicus:oai:publications.copernicus.org:tcd83188 2023-05-15T13:55:28+02:00 Geothermal flux beneath the Antarctic Ice Sheet derived from measured temperature profiles in deep boreholes Talalay, Pavel Li, Yazhou Augustin, Laurent Clow, Gary Hong, Jialin Lefebvre, Eric Markov, Alexey Motoyama, Hideaki Ritz, Catherine 2020-03-04 application/pdf https://doi.org/10.5194/tc-2020-32 https://tc.copernicus.org/preprints/tc-2020-32/ eng eng doi:10.5194/tc-2020-32 https://tc.copernicus.org/preprints/tc-2020-32/ eISSN: 1994-0424 Text 2020 ftcopernicus https://doi.org/10.5194/tc-2020-32 2020-07-20T16:22:22Z The temperature at the Antarctic ice sheet bed and the temperature gradient in subglacial rocks have been directly measured only a few times, although extensive thermodynamic modelling has been used to estimate geothermal heat flux under ice sheet. During the last five decades, deep ice-core drilling projects at six sites – Byrd, WAIS Divide, Dome C, Kohnen, Dome F, and Vostok – have succeeded in reaching to, or nearly to, the bed in inland locations in Antarctica. When temperature profiles in these boreholes and heat flow model are combined with estimations of vertical velocity, the heat flow at ice sheet base is translated to a geothermal heat flux of 117.8 ± 3.3 mW m −2 at Byrd, 67.3 ± 8.6 mW m −2 at Dome C, 79.0 ± 5.0 mW m −2 at Dome F, and −3.3 ± 5.6 mW m −2 at Vostok, close to predicted values. However, estimations at Kohnen and WAIS Divide gave flux of 161.5 ± 10.2 mW m −2 and 251.3 ± 24.1 mW m −2 , respectively, far higher than that predicted by existing heat flow models. The question arises as to whether this high heat flow represents regional values, or if the Kohnen and WAIS Divide boreholes were drilled over local hot spots. Text Antarc* Antarctic Antarctica ice core Ice Sheet Copernicus Publications: E-Journals Antarctic Byrd Dome F ENVELOPE(39.700,39.700,-77.317,-77.317) Kohnen ENVELOPE(0.000,0.000,-75.000,-75.000) The Antarctic |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
The temperature at the Antarctic ice sheet bed and the temperature gradient in subglacial rocks have been directly measured only a few times, although extensive thermodynamic modelling has been used to estimate geothermal heat flux under ice sheet. During the last five decades, deep ice-core drilling projects at six sites – Byrd, WAIS Divide, Dome C, Kohnen, Dome F, and Vostok – have succeeded in reaching to, or nearly to, the bed in inland locations in Antarctica. When temperature profiles in these boreholes and heat flow model are combined with estimations of vertical velocity, the heat flow at ice sheet base is translated to a geothermal heat flux of 117.8 ± 3.3 mW m −2 at Byrd, 67.3 ± 8.6 mW m −2 at Dome C, 79.0 ± 5.0 mW m −2 at Dome F, and −3.3 ± 5.6 mW m −2 at Vostok, close to predicted values. However, estimations at Kohnen and WAIS Divide gave flux of 161.5 ± 10.2 mW m −2 and 251.3 ± 24.1 mW m −2 , respectively, far higher than that predicted by existing heat flow models. The question arises as to whether this high heat flow represents regional values, or if the Kohnen and WAIS Divide boreholes were drilled over local hot spots. |
format |
Text |
author |
Talalay, Pavel Li, Yazhou Augustin, Laurent Clow, Gary Hong, Jialin Lefebvre, Eric Markov, Alexey Motoyama, Hideaki Ritz, Catherine |
spellingShingle |
Talalay, Pavel Li, Yazhou Augustin, Laurent Clow, Gary Hong, Jialin Lefebvre, Eric Markov, Alexey Motoyama, Hideaki Ritz, Catherine Geothermal flux beneath the Antarctic Ice Sheet derived from measured temperature profiles in deep boreholes |
author_facet |
Talalay, Pavel Li, Yazhou Augustin, Laurent Clow, Gary Hong, Jialin Lefebvre, Eric Markov, Alexey Motoyama, Hideaki Ritz, Catherine |
author_sort |
Talalay, Pavel |
title |
Geothermal flux beneath the Antarctic Ice Sheet derived from measured temperature profiles in deep boreholes |
title_short |
Geothermal flux beneath the Antarctic Ice Sheet derived from measured temperature profiles in deep boreholes |
title_full |
Geothermal flux beneath the Antarctic Ice Sheet derived from measured temperature profiles in deep boreholes |
title_fullStr |
Geothermal flux beneath the Antarctic Ice Sheet derived from measured temperature profiles in deep boreholes |
title_full_unstemmed |
Geothermal flux beneath the Antarctic Ice Sheet derived from measured temperature profiles in deep boreholes |
title_sort |
geothermal flux beneath the antarctic ice sheet derived from measured temperature profiles in deep boreholes |
publishDate |
2020 |
url |
https://doi.org/10.5194/tc-2020-32 https://tc.copernicus.org/preprints/tc-2020-32/ |
long_lat |
ENVELOPE(39.700,39.700,-77.317,-77.317) ENVELOPE(0.000,0.000,-75.000,-75.000) |
geographic |
Antarctic Byrd Dome F Kohnen The Antarctic |
geographic_facet |
Antarctic Byrd Dome F Kohnen The Antarctic |
genre |
Antarc* Antarctic Antarctica ice core Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica ice core Ice Sheet |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-2020-32 https://tc.copernicus.org/preprints/tc-2020-32/ |
op_doi |
https://doi.org/10.5194/tc-2020-32 |
_version_ |
1766262097191108608 |