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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ftdoajarticles:oai:doaj.org/article:2175d7ed3f3240d3b6c0be4dbc4633f4 2023-05-15T13:22:07+02:00 Evaluation of six geothermal heat flux maps for the Antarctic Lambert–Amery glacial system H. Kang L. Zhao M. Wolovick J. C. Moore 2022-09-01T00:00:00Z https://doi.org/10.5194/tc-16-3619-2022 https://doaj.org/article/2175d7ed3f3240d3b6c0be4dbc4633f4 EN eng Copernicus Publications https://tc.copernicus.org/articles/16/3619/2022/tc-16-3619-2022.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-16-3619-2022 1994-0416 1994-0424 https://doaj.org/article/2175d7ed3f3240d3b6c0be4dbc4633f4 The Cryosphere, Vol 16, Pp 3619-3633 (2022) Environmental sciences GE1-350 Geology QE1-996.5 article 2022 ftdoajarticles https://doi.org/10.5194/tc-16-3619-2022 2022-12-30T20:38:37Z 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. Article in Journal/Newspaper Amery Ice Shelf Antarc* Antarctic Antarctica Ice Sheet Ice Shelf The Cryosphere Directory of Open Access Journals: DOAJ Articles Antarctic The Antarctic Amery ENVELOPE(-94.063,-94.063,56.565,56.565) Amery Ice Shelf ENVELOPE(71.000,71.000,-69.750,-69.750) The Cryosphere 16 9 3619 3633 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 H. Kang L. Zhao M. Wolovick J. C. Moore Evaluation of six geothermal heat flux maps for the Antarctic Lambert–Amery glacial system |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
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 |
Article in Journal/Newspaper |
author |
H. Kang L. Zhao M. Wolovick J. C. Moore |
author_facet |
H. Kang L. Zhao M. Wolovick J. C. Moore |
author_sort |
H. Kang |
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 |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/tc-16-3619-2022 https://doaj.org/article/2175d7ed3f3240d3b6c0be4dbc4633f4 |
long_lat |
ENVELOPE(-94.063,-94.063,56.565,56.565) ENVELOPE(71.000,71.000,-69.750,-69.750) |
geographic |
Antarctic The Antarctic Amery Amery Ice Shelf |
geographic_facet |
Antarctic The Antarctic Amery Amery Ice Shelf |
genre |
Amery Ice Shelf Antarc* Antarctic Antarctica Ice Sheet Ice Shelf The Cryosphere |
genre_facet |
Amery Ice Shelf Antarc* Antarctic Antarctica Ice Sheet Ice Shelf The Cryosphere |
op_source |
The Cryosphere, Vol 16, Pp 3619-3633 (2022) |
op_relation |
https://tc.copernicus.org/articles/16/3619/2022/tc-16-3619-2022.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-16-3619-2022 1994-0416 1994-0424 https://doaj.org/article/2175d7ed3f3240d3b6c0be4dbc4633f4 |
op_doi |
https://doi.org/10.5194/tc-16-3619-2022 |
container_title |
The Cryosphere |
container_volume |
16 |
container_issue |
9 |
container_start_page |
3619 |
op_container_end_page |
3633 |
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1766363337239560192 |