Inferring geothermal heat flux from an ice-borehole temperature profile at Law Dome, East Antarctica
Geothermal heat flux (GHF) is an important control on the dynamics of Antarctica's ice sheet because it controls basal melt and internal deformation. However, it is hard to estimate because of a lack of in-situ measurements. Estimating GHF from ice-borehole temperature profiles is possible by c...
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Online Access: | https://doi.org/10.1017/jog.2020.27 http://ecite.utas.edu.au/138775 |
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ftunivtasecite:oai:ecite.utas.edu.au:138775 2023-05-15T13:59:46+02:00 Inferring geothermal heat flux from an ice-borehole temperature profile at Law Dome, East Antarctica Mony, L Roberts, JL Halpin, JA 2020 application/pdf https://doi.org/10.1017/jog.2020.27 http://ecite.utas.edu.au/138775 en eng Int Glaciol Soc http://ecite.utas.edu.au/138775/1/138775 - Inferring geothermal heat flux from an ice-borehole temperature.pdf http://dx.doi.org/10.1017/jog.2020.27 Mony, L and Roberts, JL and Halpin, JA, Inferring geothermal heat flux from an ice-borehole temperature profile at Law Dome, East Antarctica, Journal of Glaciology, 66, (257) pp. 509-519. ISSN 0022-1430 (2020) [Refereed Article] http://ecite.utas.edu.au/138775 Earth Sciences Physical geography and environmental geoscience Glaciology Refereed Article PeerReviewed 2020 ftunivtasecite https://doi.org/10.1017/jog.2020.27 2020-12-14T23:16:27Z Geothermal heat flux (GHF) is an important control on the dynamics of Antarctica's ice sheet because it controls basal melt and internal deformation. However, it is hard to estimate because of a lack of in-situ measurements. Estimating GHF from ice-borehole temperature profiles is possible by combining a heat-transfer equation and the physical properties of the ice sheet in a numerical model. In this study, we truncate ice-borehole temperature profiles to determine the minimum ratio of temperature profile depth to ice-sheet thickness required to produce acceptable GHF estimations. For Law Dome, a temperature profile that is within 60% of the local ice thickness is sufficient for an estimation that is within approximately one median absolute deviation of the whole-profile GHF estimation. This result is compared with the temperature profiles at Dome Fuji and the West Antarctic Ice Sheet divide which require a temperature profile that is 80% and more than 91% of the ice thickness, respectively, for comparable accuracy. In deriving GHF median estimations from truncated temperature profiles, it is possible to discriminate between available GHF models. This is valuable for assessing and constraining future GHF models. Article in Journal/Newspaper Antarc* Antarctic Antarctica Antarctica Journal East Antarctica Ice Sheet Journal of Glaciology eCite UTAS (University of Tasmania) Antarctic Dome Fuji ENVELOPE(39.700,39.700,-77.317,-77.317) East Antarctica Law Dome ENVELOPE(112.833,112.833,-66.733,-66.733) West Antarctic Ice Sheet Journal of Glaciology 66 257 509 519 |
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Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Physical geography and environmental geoscience Glaciology |
spellingShingle |
Earth Sciences Physical geography and environmental geoscience Glaciology Mony, L Roberts, JL Halpin, JA Inferring geothermal heat flux from an ice-borehole temperature profile at Law Dome, East Antarctica |
topic_facet |
Earth Sciences Physical geography and environmental geoscience Glaciology |
description |
Geothermal heat flux (GHF) is an important control on the dynamics of Antarctica's ice sheet because it controls basal melt and internal deformation. However, it is hard to estimate because of a lack of in-situ measurements. Estimating GHF from ice-borehole temperature profiles is possible by combining a heat-transfer equation and the physical properties of the ice sheet in a numerical model. In this study, we truncate ice-borehole temperature profiles to determine the minimum ratio of temperature profile depth to ice-sheet thickness required to produce acceptable GHF estimations. For Law Dome, a temperature profile that is within 60% of the local ice thickness is sufficient for an estimation that is within approximately one median absolute deviation of the whole-profile GHF estimation. This result is compared with the temperature profiles at Dome Fuji and the West Antarctic Ice Sheet divide which require a temperature profile that is 80% and more than 91% of the ice thickness, respectively, for comparable accuracy. In deriving GHF median estimations from truncated temperature profiles, it is possible to discriminate between available GHF models. This is valuable for assessing and constraining future GHF models. |
format |
Article in Journal/Newspaper |
author |
Mony, L Roberts, JL Halpin, JA |
author_facet |
Mony, L Roberts, JL Halpin, JA |
author_sort |
Mony, L |
title |
Inferring geothermal heat flux from an ice-borehole temperature profile at Law Dome, East Antarctica |
title_short |
Inferring geothermal heat flux from an ice-borehole temperature profile at Law Dome, East Antarctica |
title_full |
Inferring geothermal heat flux from an ice-borehole temperature profile at Law Dome, East Antarctica |
title_fullStr |
Inferring geothermal heat flux from an ice-borehole temperature profile at Law Dome, East Antarctica |
title_full_unstemmed |
Inferring geothermal heat flux from an ice-borehole temperature profile at Law Dome, East Antarctica |
title_sort |
inferring geothermal heat flux from an ice-borehole temperature profile at law dome, east antarctica |
publisher |
Int Glaciol Soc |
publishDate |
2020 |
url |
https://doi.org/10.1017/jog.2020.27 http://ecite.utas.edu.au/138775 |
long_lat |
ENVELOPE(39.700,39.700,-77.317,-77.317) ENVELOPE(112.833,112.833,-66.733,-66.733) |
geographic |
Antarctic Dome Fuji East Antarctica Law Dome West Antarctic Ice Sheet |
geographic_facet |
Antarctic Dome Fuji East Antarctica Law Dome West Antarctic Ice Sheet |
genre |
Antarc* Antarctic Antarctica Antarctica Journal East Antarctica Ice Sheet Journal of Glaciology |
genre_facet |
Antarc* Antarctic Antarctica Antarctica Journal East Antarctica Ice Sheet Journal of Glaciology |
op_relation |
http://ecite.utas.edu.au/138775/1/138775 - Inferring geothermal heat flux from an ice-borehole temperature.pdf http://dx.doi.org/10.1017/jog.2020.27 Mony, L and Roberts, JL and Halpin, JA, Inferring geothermal heat flux from an ice-borehole temperature profile at Law Dome, East Antarctica, Journal of Glaciology, 66, (257) pp. 509-519. ISSN 0022-1430 (2020) [Refereed Article] http://ecite.utas.edu.au/138775 |
op_doi |
https://doi.org/10.1017/jog.2020.27 |
container_title |
Journal of Glaciology |
container_volume |
66 |
container_issue |
257 |
container_start_page |
509 |
op_container_end_page |
519 |
_version_ |
1766268541580869632 |