Crustal Heterogeneity of Antarctica Signals Spatially Variable Radiogenic Heat Production
Abstract Geothermal heat flow (GHF) is a key basal boundary condition for Antarctic ice‐sheet flow. Large‐scale variations are resolved by several recent models but knowledge of the smaller‐scale variations, crucial for ice sheet dynamics, is limited by unresolved variations in crustal radiogenic he...
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Online Access: | https://doi.org/10.1029/2023GL106201 https://doaj.org/article/b0163c52e0064c5b95e0e5d7d36e57bc |
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ftdoajarticles:oai:doaj.org/article:b0163c52e0064c5b95e0e5d7d36e57bc 2024-09-15T17:48:22+00:00 Crustal Heterogeneity of Antarctica Signals Spatially Variable Radiogenic Heat Production L. Li A. R. A. Aitken 2024-01-01T00:00:00Z https://doi.org/10.1029/2023GL106201 https://doaj.org/article/b0163c52e0064c5b95e0e5d7d36e57bc EN eng Wiley https://doi.org/10.1029/2023GL106201 https://doaj.org/toc/0094-8276 https://doaj.org/toc/1944-8007 1944-8007 0094-8276 doi:10.1029/2023GL106201 https://doaj.org/article/b0163c52e0064c5b95e0e5d7d36e57bc Geophysical Research Letters, Vol 51, Iss 2, Pp n/a-n/a (2024) heat production Antarctica geothermal heat flow gravity Moho crust Geophysics. Cosmic physics QC801-809 article 2024 ftdoajarticles https://doi.org/10.1029/2023GL106201 2024-08-05T17:49:10Z Abstract Geothermal heat flow (GHF) is a key basal boundary condition for Antarctic ice‐sheet flow. Large‐scale variations are resolved by several recent models but knowledge of the smaller‐scale variations, crucial for ice sheet dynamics, is limited by unresolved variations in crustal radiogenic heat production. To define this at continent‐scale we use 3D gravity inversion constrained by seismic Moho estimates to identify variations in crustal composition and geometry beneath thick ice. Geochemically‐defined empirical relationships between density and heat production capture the global average trend and its variability, and allow to estimate from upper‐crust density spatial variations in radiogenic heat production. Significant variations are observed typically 1.2–1.6 μW/m3, and as high as 2 μW/m3 in West Antarctica. The contribution to GHF from these heat‐production variations is similarly variable, typically 16–24 mW/m2 and up to 60 mW/m2. The mapped variations are significant for correctly representing GHF in Antarctica. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet West Antarctica Directory of Open Access Journals: DOAJ Articles Geophysical Research Letters 51 2 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
heat production Antarctica geothermal heat flow gravity Moho crust Geophysics. Cosmic physics QC801-809 |
spellingShingle |
heat production Antarctica geothermal heat flow gravity Moho crust Geophysics. Cosmic physics QC801-809 L. Li A. R. A. Aitken Crustal Heterogeneity of Antarctica Signals Spatially Variable Radiogenic Heat Production |
topic_facet |
heat production Antarctica geothermal heat flow gravity Moho crust Geophysics. Cosmic physics QC801-809 |
description |
Abstract Geothermal heat flow (GHF) is a key basal boundary condition for Antarctic ice‐sheet flow. Large‐scale variations are resolved by several recent models but knowledge of the smaller‐scale variations, crucial for ice sheet dynamics, is limited by unresolved variations in crustal radiogenic heat production. To define this at continent‐scale we use 3D gravity inversion constrained by seismic Moho estimates to identify variations in crustal composition and geometry beneath thick ice. Geochemically‐defined empirical relationships between density and heat production capture the global average trend and its variability, and allow to estimate from upper‐crust density spatial variations in radiogenic heat production. Significant variations are observed typically 1.2–1.6 μW/m3, and as high as 2 μW/m3 in West Antarctica. The contribution to GHF from these heat‐production variations is similarly variable, typically 16–24 mW/m2 and up to 60 mW/m2. The mapped variations are significant for correctly representing GHF in Antarctica. |
format |
Article in Journal/Newspaper |
author |
L. Li A. R. A. Aitken |
author_facet |
L. Li A. R. A. Aitken |
author_sort |
L. Li |
title |
Crustal Heterogeneity of Antarctica Signals Spatially Variable Radiogenic Heat Production |
title_short |
Crustal Heterogeneity of Antarctica Signals Spatially Variable Radiogenic Heat Production |
title_full |
Crustal Heterogeneity of Antarctica Signals Spatially Variable Radiogenic Heat Production |
title_fullStr |
Crustal Heterogeneity of Antarctica Signals Spatially Variable Radiogenic Heat Production |
title_full_unstemmed |
Crustal Heterogeneity of Antarctica Signals Spatially Variable Radiogenic Heat Production |
title_sort |
crustal heterogeneity of antarctica signals spatially variable radiogenic heat production |
publisher |
Wiley |
publishDate |
2024 |
url |
https://doi.org/10.1029/2023GL106201 https://doaj.org/article/b0163c52e0064c5b95e0e5d7d36e57bc |
genre |
Antarc* Antarctic Antarctica Ice Sheet West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet West Antarctica |
op_source |
Geophysical Research Letters, Vol 51, Iss 2, Pp n/a-n/a (2024) |
op_relation |
https://doi.org/10.1029/2023GL106201 https://doaj.org/toc/0094-8276 https://doaj.org/toc/1944-8007 1944-8007 0094-8276 doi:10.1029/2023GL106201 https://doaj.org/article/b0163c52e0064c5b95e0e5d7d36e57bc |
op_doi |
https://doi.org/10.1029/2023GL106201 |
container_title |
Geophysical Research Letters |
container_volume |
51 |
container_issue |
2 |
_version_ |
1810289512839905280 |