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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Cambridge University Press
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ftdoajarticles:oai:doaj.org/article:b383200fbed2423caa86fc9986aa67c1 2023-05-15T13:31:42+02:00 Inferring geothermal heat flux from an ice-borehole temperature profile at Law Dome, East Antarctica Laura Mony Jason L. Roberts Jacqueline A. Halpin 2020-06-01T00:00:00Z https://doi.org/10.1017/jog.2020.27 https://doaj.org/article/b383200fbed2423caa86fc9986aa67c1 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143020000271/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2020.27 0022-1430 1727-5652 https://doaj.org/article/b383200fbed2423caa86fc9986aa67c1 Journal of Glaciology, Vol 66, Pp 509-519 (2020) Glacier geophysics ice core ice dynamics ice temperature Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2020 ftdoajarticles https://doi.org/10.1017/jog.2020.27 2023-03-12T01:30:57Z 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 East Antarctica ice core Ice Sheet Journal of Glaciology Directory of Open Access Journals: DOAJ Articles Antarctic East Antarctica West Antarctic Ice Sheet Dome Fuji ENVELOPE(39.700,39.700,-77.317,-77.317) Law Dome ENVELOPE(112.833,112.833,-66.733,-66.733) Journal of Glaciology 66 257 509 519 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Glacier geophysics ice core ice dynamics ice temperature Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
Glacier geophysics ice core ice dynamics ice temperature Environmental sciences GE1-350 Meteorology. Climatology QC851-999 Laura Mony Jason L. Roberts Jacqueline A. Halpin Inferring geothermal heat flux from an ice-borehole temperature profile at Law Dome, East Antarctica |
topic_facet |
Glacier geophysics ice core ice dynamics ice temperature Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
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 |
Laura Mony Jason L. Roberts Jacqueline A. Halpin |
author_facet |
Laura Mony Jason L. Roberts Jacqueline A. Halpin |
author_sort |
Laura Mony |
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 |
Cambridge University Press |
publishDate |
2020 |
url |
https://doi.org/10.1017/jog.2020.27 https://doaj.org/article/b383200fbed2423caa86fc9986aa67c1 |
long_lat |
ENVELOPE(39.700,39.700,-77.317,-77.317) ENVELOPE(112.833,112.833,-66.733,-66.733) |
geographic |
Antarctic East Antarctica West Antarctic Ice Sheet Dome Fuji Law Dome |
geographic_facet |
Antarctic East Antarctica West Antarctic Ice Sheet Dome Fuji Law Dome |
genre |
Antarc* Antarctic Antarctica East Antarctica ice core Ice Sheet Journal of Glaciology |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica ice core Ice Sheet Journal of Glaciology |
op_source |
Journal of Glaciology, Vol 66, Pp 509-519 (2020) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143020000271/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2020.27 0022-1430 1727-5652 https://doaj.org/article/b383200fbed2423caa86fc9986aa67c1 |
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_ |
1766020415104221184 |