Evaluation of six geothermal heat flux maps for the Antarctic Lambert–Amery glacial system
Basal thermal conditions play an important role in ice sheet dynamics, and they are sensitive to geothermal heat flux (GHF). Here we estimate the basal thermal conditions, including basal temperature, basal melt rate, and friction heat underneath the Lambert–Amery Glacier system in eastern Antarctic...
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ftcopernicus:oai:publications.copernicus.org:tc99225 2023-05-15T13:22:06+02:00 Evaluation of six geothermal heat flux maps for the Antarctic Lambert–Amery glacial system Kang, Haoran Zhao, Liyun Wolovick, Michael Moore, John C. 2022-09-08 application/pdf https://doi.org/10.5194/tc-16-3619-2022 https://tc.copernicus.org/articles/16/3619/2022/ eng eng doi:10.5194/tc-16-3619-2022 https://tc.copernicus.org/articles/16/3619/2022/ eISSN: 1994-0424 Text 2022 ftcopernicus https://doi.org/10.5194/tc-16-3619-2022 2022-09-12T16:22:53Z Basal thermal conditions play an important role in ice sheet dynamics, and they are sensitive to geothermal heat flux (GHF). Here we estimate the basal thermal conditions, including basal temperature, basal melt rate, and friction heat underneath the Lambert–Amery Glacier system in eastern Antarctica, using a combination of a forward model and an inversion from a 3D ice flow model. We assess the sensitivity and uncertainty of basal thermal conditions using six different GHF maps. We evaluate the modelled results using all observed subglacial lakes. The different GHF maps lead to large differences in simulated spatial patterns of temperate basal conditions. The two recent GHF fields inverted from aerial geomagnetic observations have the highest GHF, produce the largest warm-based area, and match the observed distribution of subglacial lakes better than the other GHFs. The modelled basal melt rate reaches 10 to hundreds of millimetres per year locally in the Lambert, Lepekhin, and Kronshtadtskiy glaciers feeding the Amery Ice Shelf and ranges from 0–5 mm yr −1 on the temperate base of the vast inland region. Text Amery Ice Shelf Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Copernicus Publications: E-Journals Amery ENVELOPE(-94.063,-94.063,56.565,56.565) Amery Ice Shelf ENVELOPE(71.000,71.000,-69.750,-69.750) Antarctic The Antarctic The Cryosphere 16 9 3619 3633 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
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English |
description |
Basal thermal conditions play an important role in ice sheet dynamics, and they are sensitive to geothermal heat flux (GHF). Here we estimate the basal thermal conditions, including basal temperature, basal melt rate, and friction heat underneath the Lambert–Amery Glacier system in eastern Antarctica, using a combination of a forward model and an inversion from a 3D ice flow model. We assess the sensitivity and uncertainty of basal thermal conditions using six different GHF maps. We evaluate the modelled results using all observed subglacial lakes. The different GHF maps lead to large differences in simulated spatial patterns of temperate basal conditions. The two recent GHF fields inverted from aerial geomagnetic observations have the highest GHF, produce the largest warm-based area, and match the observed distribution of subglacial lakes better than the other GHFs. The modelled basal melt rate reaches 10 to hundreds of millimetres per year locally in the Lambert, Lepekhin, and Kronshtadtskiy glaciers feeding the Amery Ice Shelf and ranges from 0–5 mm yr −1 on the temperate base of the vast inland region. |
format |
Text |
author |
Kang, Haoran Zhao, Liyun Wolovick, Michael Moore, John C. |
spellingShingle |
Kang, Haoran Zhao, Liyun Wolovick, Michael Moore, John C. Evaluation of six geothermal heat flux maps for the Antarctic Lambert–Amery glacial system |
author_facet |
Kang, Haoran Zhao, Liyun Wolovick, Michael Moore, John C. |
author_sort |
Kang, Haoran |
title |
Evaluation of six geothermal heat flux maps for the Antarctic Lambert–Amery glacial system |
title_short |
Evaluation of six geothermal heat flux maps for the Antarctic Lambert–Amery glacial system |
title_full |
Evaluation of six geothermal heat flux maps for the Antarctic Lambert–Amery glacial system |
title_fullStr |
Evaluation of six geothermal heat flux maps for the Antarctic Lambert–Amery glacial system |
title_full_unstemmed |
Evaluation of six geothermal heat flux maps for the Antarctic Lambert–Amery glacial system |
title_sort |
evaluation of six geothermal heat flux maps for the antarctic lambert–amery glacial system |
publishDate |
2022 |
url |
https://doi.org/10.5194/tc-16-3619-2022 https://tc.copernicus.org/articles/16/3619/2022/ |
long_lat |
ENVELOPE(-94.063,-94.063,56.565,56.565) ENVELOPE(71.000,71.000,-69.750,-69.750) |
geographic |
Amery Amery Ice Shelf Antarctic The Antarctic |
geographic_facet |
Amery Amery Ice Shelf Antarctic The Antarctic |
genre |
Amery Ice Shelf Antarc* Antarctic Antarctica Ice Sheet Ice Shelf |
genre_facet |
Amery Ice Shelf Antarc* Antarctic Antarctica Ice Sheet Ice Shelf |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-16-3619-2022 https://tc.copernicus.org/articles/16/3619/2022/ |
op_doi |
https://doi.org/10.5194/tc-16-3619-2022 |
container_title |
The Cryosphere |
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16 |
container_issue |
9 |
container_start_page |
3619 |
op_container_end_page |
3633 |
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1766363325575200768 |