Geothermal heat flux from measured temperature profiles in deep ice boreholes in Antarctica
International audience 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 modeling has been used to estimate the geothermal heat flux (GHF) under the ice sheet. During the last...
Published in: | The Cryosphere |
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Main Authors: | , , , , , , , , |
Other Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2020
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Subjects: | |
Online Access: | https://hal.science/hal-03036864 https://hal.science/hal-03036864/document https://hal.science/hal-03036864/file/tc-14-4021-2020.pdf https://doi.org/10.5194/tc-14-4021-2020 |
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ftunigrenoble:oai:HAL:hal-03036864v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Université Grenoble Alpes: HAL |
op_collection_id |
ftunigrenoble |
language |
English |
topic |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
spellingShingle |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology Talalay, Pavel Li, Yazhou Augustin, Laurent Clow, Gary Hong, Jialin Lefebvre, Eric Markov, Alexey Motoyama, Hideaki Ritz, Catherine Geothermal heat flux from measured temperature profiles in deep ice boreholes in Antarctica |
topic_facet |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
description |
International audience 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 modeling has been used to estimate the geothermal heat flux (GHF) under the ice sheet. During the last 5 decades, deep ice-core drilling projects at six sites – Byrd, WAIS Divide, Dome C, Kohnen, Dome F, and Vostok – have succeeded in reaching or nearly reaching the bed at inland locations in Antarctica. When temperature profiles in these boreholes and steady-state heat flow modeling are combined with estimates of vertical velocity, the heat flow at the ice-sheet base is translated to a geothermal heat flux of 57.9 ± 6.4 mW m−2 at Dome C, 78.9 ± 5.0 mW m−2 at Dome F, and 86.9 ± 16.6 mW m−2 at Kohnen, all higher than the predicted values at these sites. This warm base under the East Antarctic Ice Sheet (EAIS) could be caused by radiogenic heat effects or hydrothermal circulation not accounted for by the models. The GHF at the base of the ice sheet at Vostok has a negative value of −3.6 ± 5.3 mW m−2, indicating that water from Lake Vostok is freezing onto the ice-sheet base. Correlation analyses between modeled and measured depth–age scales at the EAIS sites indicate that all of them can be adequately approximated by a steady-state model. Horizontal velocities and their variation over ice-age cycles are much greater for the West Antarctic Ice Sheet than for the interior EAIS sites; a steady-state model cannot precisely describe the temperature distribution here. Even if the correlation factors for the best fitting age–depth curve are only moderate for the West Antarctic sites, the GHF values estimated here of 88.4 ± 7.6 mW m−2 at Byrd and 113.3 ± 16.9 mW m−2 at WAIS Divide can be used as references before more precise estimates are made on the subject. |
author2 |
Translational Gerontology Branch, Intramural Research Program, National Institute on Aging, National Institute of Aging Division technique INSU/SDU (DTI) Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ) Université Grenoble Alpes (UGA) National Institute of Polar Research Tokyo (NiPR) |
format |
Article in Journal/Newspaper |
author |
Talalay, Pavel Li, Yazhou Augustin, Laurent Clow, Gary Hong, Jialin Lefebvre, Eric Markov, Alexey Motoyama, Hideaki Ritz, Catherine |
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 heat flux from measured temperature profiles in deep ice boreholes in Antarctica |
title_short |
Geothermal heat flux from measured temperature profiles in deep ice boreholes in Antarctica |
title_full |
Geothermal heat flux from measured temperature profiles in deep ice boreholes in Antarctica |
title_fullStr |
Geothermal heat flux from measured temperature profiles in deep ice boreholes in Antarctica |
title_full_unstemmed |
Geothermal heat flux from measured temperature profiles in deep ice boreholes in Antarctica |
title_sort |
geothermal heat flux from measured temperature profiles in deep ice boreholes in antarctica |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.science/hal-03036864 https://hal.science/hal-03036864/document https://hal.science/hal-03036864/file/tc-14-4021-2020.pdf https://doi.org/10.5194/tc-14-4021-2020 |
long_lat |
ENVELOPE(39.700,39.700,-77.317,-77.317) ENVELOPE(0.000,0.000,-75.000,-75.000) ENVELOPE(106.000,106.000,-77.500,-77.500) |
geographic |
Antarctic Byrd Dome F East Antarctic Ice Sheet Kohnen Lake Vostok The Antarctic West Antarctic Ice Sheet |
geographic_facet |
Antarctic Byrd Dome F East Antarctic Ice Sheet Kohnen Lake Vostok The Antarctic West Antarctic Ice Sheet |
genre |
Antarc* Antarctic Antarctica ice core Ice Sheet The Cryosphere |
genre_facet |
Antarc* Antarctic Antarctica ice core Ice Sheet The Cryosphere |
op_source |
ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://hal.science/hal-03036864 The Cryosphere, 2020, 14 (11), pp.4021-4037. ⟨10.5194/tc-14-4021-2020⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-14-4021-2020 hal-03036864 https://hal.science/hal-03036864 https://hal.science/hal-03036864/document https://hal.science/hal-03036864/file/tc-14-4021-2020.pdf doi:10.5194/tc-14-4021-2020 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/tc-14-4021-2020 |
container_title |
The Cryosphere |
container_volume |
14 |
container_issue |
11 |
container_start_page |
4021 |
op_container_end_page |
4037 |
_version_ |
1798835723906842624 |
spelling |
ftunigrenoble:oai:HAL:hal-03036864v1 2024-05-12T07:55:51+00:00 Geothermal heat flux from measured temperature profiles in deep ice boreholes in Antarctica Talalay, Pavel Li, Yazhou Augustin, Laurent Clow, Gary Hong, Jialin Lefebvre, Eric Markov, Alexey Motoyama, Hideaki Ritz, Catherine Translational Gerontology Branch, Intramural Research Program, National Institute on Aging, National Institute of Aging Division technique INSU/SDU (DTI) Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ) Université Grenoble Alpes (UGA) National Institute of Polar Research Tokyo (NiPR) 2020 https://hal.science/hal-03036864 https://hal.science/hal-03036864/document https://hal.science/hal-03036864/file/tc-14-4021-2020.pdf https://doi.org/10.5194/tc-14-4021-2020 en eng HAL CCSD Copernicus info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-14-4021-2020 hal-03036864 https://hal.science/hal-03036864 https://hal.science/hal-03036864/document https://hal.science/hal-03036864/file/tc-14-4021-2020.pdf doi:10.5194/tc-14-4021-2020 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://hal.science/hal-03036864 The Cryosphere, 2020, 14 (11), pp.4021-4037. ⟨10.5194/tc-14-4021-2020⟩ [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology info:eu-repo/semantics/article Journal articles 2020 ftunigrenoble https://doi.org/10.5194/tc-14-4021-2020 2024-04-18T03:15:32Z International audience 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 modeling has been used to estimate the geothermal heat flux (GHF) under the ice sheet. During the last 5 decades, deep ice-core drilling projects at six sites – Byrd, WAIS Divide, Dome C, Kohnen, Dome F, and Vostok – have succeeded in reaching or nearly reaching the bed at inland locations in Antarctica. When temperature profiles in these boreholes and steady-state heat flow modeling are combined with estimates of vertical velocity, the heat flow at the ice-sheet base is translated to a geothermal heat flux of 57.9 ± 6.4 mW m−2 at Dome C, 78.9 ± 5.0 mW m−2 at Dome F, and 86.9 ± 16.6 mW m−2 at Kohnen, all higher than the predicted values at these sites. This warm base under the East Antarctic Ice Sheet (EAIS) could be caused by radiogenic heat effects or hydrothermal circulation not accounted for by the models. The GHF at the base of the ice sheet at Vostok has a negative value of −3.6 ± 5.3 mW m−2, indicating that water from Lake Vostok is freezing onto the ice-sheet base. Correlation analyses between modeled and measured depth–age scales at the EAIS sites indicate that all of them can be adequately approximated by a steady-state model. Horizontal velocities and their variation over ice-age cycles are much greater for the West Antarctic Ice Sheet than for the interior EAIS sites; a steady-state model cannot precisely describe the temperature distribution here. Even if the correlation factors for the best fitting age–depth curve are only moderate for the West Antarctic sites, the GHF values estimated here of 88.4 ± 7.6 mW m−2 at Byrd and 113.3 ± 16.9 mW m−2 at WAIS Divide can be used as references before more precise estimates are made on the subject. Article in Journal/Newspaper Antarc* Antarctic Antarctica ice core Ice Sheet The Cryosphere Université Grenoble Alpes: HAL Antarctic Byrd Dome F ENVELOPE(39.700,39.700,-77.317,-77.317) East Antarctic Ice Sheet Kohnen ENVELOPE(0.000,0.000,-75.000,-75.000) Lake Vostok ENVELOPE(106.000,106.000,-77.500,-77.500) The Antarctic West Antarctic Ice Sheet The Cryosphere 14 11 4021 4037 |