Mapping age and basal conditions of ice in the Dome Fuji region, Antarctica, by combining radar internal layer stratigraphy and flow modeling
International audience The Dome Fuji (DF) region in Antarctica is a potential site for an ice core with a record of over 1 Myr. Here, we combine large-scale internal airborne radar stratigraphy with a 1-D model to estimate the age of basal ice in the DF region. The radar data used in the study were...
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Online Access: | https://hal.science/hal-04235029 https://hal.science/hal-04235029/document https://hal.science/hal-04235029/file/tc-17-4297-2023.pdf https://doi.org/10.5194/tc-17-4297-2023 |
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ftinsu:oai:HAL:hal-04235029v1 2024-04-28T08:00:38+00:00 Mapping age and basal conditions of ice in the Dome Fuji region, Antarctica, by combining radar internal layer stratigraphy and flow modeling Wang, Zhuo Chung, Ailsa Steinhage, Daniel Parrenin, Frédéric Freitag, Johannes Eisen, Olaf Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ) Université Grenoble Alpes (UGA) 2023 https://hal.science/hal-04235029 https://hal.science/hal-04235029/document https://hal.science/hal-04235029/file/tc-17-4297-2023.pdf https://doi.org/10.5194/tc-17-4297-2023 en eng HAL CCSD Copernicus info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-17-4297-2023 hal-04235029 https://hal.science/hal-04235029 https://hal.science/hal-04235029/document https://hal.science/hal-04235029/file/tc-17-4297-2023.pdf doi:10.5194/tc-17-4297-2023 info:eu-repo/semantics/OpenAccess ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://hal.science/hal-04235029 The Cryosphere, 2023, 17 (10), pp.4297-4314. ⟨10.5194/tc-17-4297-2023⟩ [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology info:eu-repo/semantics/article Journal articles 2023 ftinsu https://doi.org/10.5194/tc-17-4297-2023 2024-04-05T00:28:17Z International audience The Dome Fuji (DF) region in Antarctica is a potential site for an ice core with a record of over 1 Myr. Here, we combine large-scale internal airborne radar stratigraphy with a 1-D model to estimate the age of basal ice in the DF region. The radar data used in the study were collected in a survey during the 2016–2017 Antarctic season. We transfer the latest age–depth scales from the DF ice core to isochrones traced in radargrams in the surrounding 500 km × 550 km region. At each point of the survey the 1-D model uses the ages of isochrones to construct the age–depth scale at depths where dated isochrones do not exist, the surface accumulation rate and the basal thermal condition, including melt rate and the thickness of stagnant ice. Our resulting age distribution and age density suggest that several promising sites with ice older than 1.5 Myr in the DF region might exist. The deduced melt rates and presence of stagnant ice provide more constraints for locating sites with a cold base. The accumulation rates range from 0.015 to 0.038 m a−1 ice equivalent. Based on sensitivity studies we find that the number and depth of picked isochrones and the timescale of the ice core severely affect the model results. Our study demonstrates that constraints from deep radar isochrones and a trustworthy timescale could improve the model estimation to find old ice in the DF region. Article in Journal/Newspaper Antarc* Antarctic Antarctica ice core The Cryosphere Institut national des sciences de l'Univers: HAL-INSU The Cryosphere 17 10 4297 4314 |
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Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
spellingShingle |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology Wang, Zhuo Chung, Ailsa Steinhage, Daniel Parrenin, Frédéric Freitag, Johannes Eisen, Olaf Mapping age and basal conditions of ice in the Dome Fuji region, Antarctica, by combining radar internal layer stratigraphy and flow modeling |
topic_facet |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
description |
International audience The Dome Fuji (DF) region in Antarctica is a potential site for an ice core with a record of over 1 Myr. Here, we combine large-scale internal airborne radar stratigraphy with a 1-D model to estimate the age of basal ice in the DF region. The radar data used in the study were collected in a survey during the 2016–2017 Antarctic season. We transfer the latest age–depth scales from the DF ice core to isochrones traced in radargrams in the surrounding 500 km × 550 km region. At each point of the survey the 1-D model uses the ages of isochrones to construct the age–depth scale at depths where dated isochrones do not exist, the surface accumulation rate and the basal thermal condition, including melt rate and the thickness of stagnant ice. Our resulting age distribution and age density suggest that several promising sites with ice older than 1.5 Myr in the DF region might exist. The deduced melt rates and presence of stagnant ice provide more constraints for locating sites with a cold base. The accumulation rates range from 0.015 to 0.038 m a−1 ice equivalent. Based on sensitivity studies we find that the number and depth of picked isochrones and the timescale of the ice core severely affect the model results. Our study demonstrates that constraints from deep radar isochrones and a trustworthy timescale could improve the model estimation to find old ice in the DF region. |
author2 |
Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ) Université Grenoble Alpes (UGA) |
format |
Article in Journal/Newspaper |
author |
Wang, Zhuo Chung, Ailsa Steinhage, Daniel Parrenin, Frédéric Freitag, Johannes Eisen, Olaf |
author_facet |
Wang, Zhuo Chung, Ailsa Steinhage, Daniel Parrenin, Frédéric Freitag, Johannes Eisen, Olaf |
author_sort |
Wang, Zhuo |
title |
Mapping age and basal conditions of ice in the Dome Fuji region, Antarctica, by combining radar internal layer stratigraphy and flow modeling |
title_short |
Mapping age and basal conditions of ice in the Dome Fuji region, Antarctica, by combining radar internal layer stratigraphy and flow modeling |
title_full |
Mapping age and basal conditions of ice in the Dome Fuji region, Antarctica, by combining radar internal layer stratigraphy and flow modeling |
title_fullStr |
Mapping age and basal conditions of ice in the Dome Fuji region, Antarctica, by combining radar internal layer stratigraphy and flow modeling |
title_full_unstemmed |
Mapping age and basal conditions of ice in the Dome Fuji region, Antarctica, by combining radar internal layer stratigraphy and flow modeling |
title_sort |
mapping age and basal conditions of ice in the dome fuji region, antarctica, by combining radar internal layer stratigraphy and flow modeling |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://hal.science/hal-04235029 https://hal.science/hal-04235029/document https://hal.science/hal-04235029/file/tc-17-4297-2023.pdf https://doi.org/10.5194/tc-17-4297-2023 |
genre |
Antarc* Antarctic Antarctica ice core The Cryosphere |
genre_facet |
Antarc* Antarctic Antarctica ice core The Cryosphere |
op_source |
ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://hal.science/hal-04235029 The Cryosphere, 2023, 17 (10), pp.4297-4314. ⟨10.5194/tc-17-4297-2023⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-17-4297-2023 hal-04235029 https://hal.science/hal-04235029 https://hal.science/hal-04235029/document https://hal.science/hal-04235029/file/tc-17-4297-2023.pdf doi:10.5194/tc-17-4297-2023 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/tc-17-4297-2023 |
container_title |
The Cryosphere |
container_volume |
17 |
container_issue |
10 |
container_start_page |
4297 |
op_container_end_page |
4314 |
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1797572764921495552 |