Using specularity content to evaluate eight geothermal heat flow maps of Totten Glacier
Geothermal heat flow (GHF) is the dominant factor affecting the basal thermal regime of ice sheet dynamics. But it is poorly defined for the Antarctic ice sheet. We compare the basal thermal state of the Totten Glacier catchment as simulated by eight different GHF datasets. We use a basal energy and...
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Copernicus Publications
2024
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00070842 2024-02-04T09:53:28+01:00 Using specularity content to evaluate eight geothermal heat flow maps of Totten Glacier Huang, Yan Zhao, Liyun Wolovick, Michael Ma, Yiliang Moore, John C. 2024-01 electronic https://doi.org/10.5194/tc-18-103-2024 https://noa.gwlb.de/receive/cop_mods_00070842 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00069171/tc-18-103-2024.pdf https://tc.copernicus.org/articles/18/103/2024/tc-18-103-2024.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-18-103-2024 https://noa.gwlb.de/receive/cop_mods_00070842 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00069171/tc-18-103-2024.pdf https://tc.copernicus.org/articles/18/103/2024/tc-18-103-2024.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2024 ftnonlinearchiv https://doi.org/10.5194/tc-18-103-2024 2024-01-08T00:22:45Z Geothermal heat flow (GHF) is the dominant factor affecting the basal thermal regime of ice sheet dynamics. But it is poorly defined for the Antarctic ice sheet. We compare the basal thermal state of the Totten Glacier catchment as simulated by eight different GHF datasets. We use a basal energy and water flow model coupled with a 3D full-Stokes ice dynamics model to estimate the basal temperature, basal friction heat and basal melting rate. In addition to the location of subglacial lakes, we use specularity content of the airborne radar returns as a two-sided constraint to discriminate between local wet or dry basal conditions and compare the returns with the basal state simulations with different GHFs. Two medium magnitude GHF distribution maps derived from seismic modelling rank well at simulating both cold- and warm-bed regions, the GHFs from Shen et al. (2020) and Shapiro and Ritzwoller (2004). The best-fit simulated result shows that most of the inland bed area is frozen. Only the central inland subglacial canyon, co-located with high specularity content, reaches the pressure melting point consistently in all the eight GHFs. Modelled basal melting rates in the slow-flowing region are generally 0–5 mm yr−1 but with local maxima of 10 mm yr−1 at the central inland subglacial canyon. The fast-flowing grounded glaciers close to the Totten ice shelf are lubricating their bases with meltwater at rates of 10–400 mm yr−1. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Ice Shelf The Cryosphere Totten Glacier Totten Ice Shelf Niedersächsisches Online-Archiv NOA Antarctic The Antarctic Totten Glacier ENVELOPE(116.333,116.333,-66.833,-66.833) The Cryosphere 18 1 103 119 |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Huang, Yan Zhao, Liyun Wolovick, Michael Ma, Yiliang Moore, John C. Using specularity content to evaluate eight geothermal heat flow maps of Totten Glacier |
topic_facet |
article Verlagsveröffentlichung |
description |
Geothermal heat flow (GHF) is the dominant factor affecting the basal thermal regime of ice sheet dynamics. But it is poorly defined for the Antarctic ice sheet. We compare the basal thermal state of the Totten Glacier catchment as simulated by eight different GHF datasets. We use a basal energy and water flow model coupled with a 3D full-Stokes ice dynamics model to estimate the basal temperature, basal friction heat and basal melting rate. In addition to the location of subglacial lakes, we use specularity content of the airborne radar returns as a two-sided constraint to discriminate between local wet or dry basal conditions and compare the returns with the basal state simulations with different GHFs. Two medium magnitude GHF distribution maps derived from seismic modelling rank well at simulating both cold- and warm-bed regions, the GHFs from Shen et al. (2020) and Shapiro and Ritzwoller (2004). The best-fit simulated result shows that most of the inland bed area is frozen. Only the central inland subglacial canyon, co-located with high specularity content, reaches the pressure melting point consistently in all the eight GHFs. Modelled basal melting rates in the slow-flowing region are generally 0–5 mm yr−1 but with local maxima of 10 mm yr−1 at the central inland subglacial canyon. The fast-flowing grounded glaciers close to the Totten ice shelf are lubricating their bases with meltwater at rates of 10–400 mm yr−1. |
format |
Article in Journal/Newspaper |
author |
Huang, Yan Zhao, Liyun Wolovick, Michael Ma, Yiliang Moore, John C. |
author_facet |
Huang, Yan Zhao, Liyun Wolovick, Michael Ma, Yiliang Moore, John C. |
author_sort |
Huang, Yan |
title |
Using specularity content to evaluate eight geothermal heat flow maps of Totten Glacier |
title_short |
Using specularity content to evaluate eight geothermal heat flow maps of Totten Glacier |
title_full |
Using specularity content to evaluate eight geothermal heat flow maps of Totten Glacier |
title_fullStr |
Using specularity content to evaluate eight geothermal heat flow maps of Totten Glacier |
title_full_unstemmed |
Using specularity content to evaluate eight geothermal heat flow maps of Totten Glacier |
title_sort |
using specularity content to evaluate eight geothermal heat flow maps of totten glacier |
publisher |
Copernicus Publications |
publishDate |
2024 |
url |
https://doi.org/10.5194/tc-18-103-2024 https://noa.gwlb.de/receive/cop_mods_00070842 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00069171/tc-18-103-2024.pdf https://tc.copernicus.org/articles/18/103/2024/tc-18-103-2024.pdf |
long_lat |
ENVELOPE(116.333,116.333,-66.833,-66.833) |
geographic |
Antarctic The Antarctic Totten Glacier |
geographic_facet |
Antarctic The Antarctic Totten Glacier |
genre |
Antarc* Antarctic Ice Sheet Ice Shelf The Cryosphere Totten Glacier Totten Ice Shelf |
genre_facet |
Antarc* Antarctic Ice Sheet Ice Shelf The Cryosphere Totten Glacier Totten Ice Shelf |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-18-103-2024 https://noa.gwlb.de/receive/cop_mods_00070842 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00069171/tc-18-103-2024.pdf https://tc.copernicus.org/articles/18/103/2024/tc-18-103-2024.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-18-103-2024 |
container_title |
The Cryosphere |
container_volume |
18 |
container_issue |
1 |
container_start_page |
103 |
op_container_end_page |
119 |
_version_ |
1789966023565246464 |