Is there 1.5-million-year-old ice near Dome C, Antarctica?
International audience Ice sheets provide exceptional archives of past changes in polar climate, regional environment and global atmospheric composition. The oldest dated deep ice core drilled in Antarctica has been retrieved at EPICA Dome C (EDC), reaching ∼ 800 000 years. Obtaining an older paleoc...
Published in: | The Cryosphere |
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Main Authors: | , , , , , , , , , , , |
Other Authors: | , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2017
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Subjects: | |
Online Access: | https://hal.science/hal-02395950 https://hal.science/hal-02395950/document https://hal.science/hal-02395950/file/tc-11-2427-2017%20%281%29.pdf https://doi.org/10.5194/tc-11-2427-2017 |
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Open Polar |
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Institut national des sciences de l'Univers: HAL-INSU |
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ftinsu |
language |
English |
topic |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
spellingShingle |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology Parrenin, Frédéric Cavitte, Marie, M Blankenship, Donald, D Chappellaz, Jérôme Fischer, Hubertus Gagliardini, Olivier Masson-Delmotte, Valérie Passalacqua, Olivier Ritz, Catherine Roberts, Jason Siegert, Martin Young, Duncan, A Is there 1.5-million-year-old ice near Dome C, Antarctica? |
topic_facet |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
description |
International audience Ice sheets provide exceptional archives of past changes in polar climate, regional environment and global atmospheric composition. The oldest dated deep ice core drilled in Antarctica has been retrieved at EPICA Dome C (EDC), reaching ∼ 800 000 years. Obtaining an older paleoclimatic record from Antarctica is one of the greatest challenges of the ice core community. Here, we use internal isochrones, identified from airborne radar coupled to ice-flow modelling to estimate the age of basal ice along transects in the Dome C area. Three glaciological properties are inferred from isochrones: surface accumulation rate, geothermal flux and the exponent of the Lliboutry velocity profile. We find that old ice (> 1.5 Myr, 1.5 million years) likely exists in two regions: one ∼ 40 km south-west of Dome C along the ice divide to Vostok, close to a secondary dome that we name "Little Dome C" (LDC), and a second region named "North Patch" (NP) located 10–30 km north-east of Dome C, in a region where the geothermal flux is apparently relatively low. Our work demonstrates the value of combining radar observations with ice flow modelling to accurately represent the true nature of ice flow, and understand the formation of ice-sheet architecture, in the centre of large ice sheets. |
author2 |
Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) Institute for Geophysics University of Texas at Dallas Richardson (UT Dallas) Observatoire des Sciences de l'Univers de Grenoble (OSUG ) Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) Abteilung Klinische Sozialmedizin, Berufs- und Umweltdermatologie Universität Heidelberg Heidelberg = Heidelberg University Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Glaces et Continents, Climats et Isotopes Stables (GLACCIOS) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) The University of Queensland (UQ All campuses : Brisbane, Dutton Park Gatton, Herston, St Lucia and other locations ) |
format |
Article in Journal/Newspaper |
author |
Parrenin, Frédéric Cavitte, Marie, M Blankenship, Donald, D Chappellaz, Jérôme Fischer, Hubertus Gagliardini, Olivier Masson-Delmotte, Valérie Passalacqua, Olivier Ritz, Catherine Roberts, Jason Siegert, Martin Young, Duncan, A |
author_facet |
Parrenin, Frédéric Cavitte, Marie, M Blankenship, Donald, D Chappellaz, Jérôme Fischer, Hubertus Gagliardini, Olivier Masson-Delmotte, Valérie Passalacqua, Olivier Ritz, Catherine Roberts, Jason Siegert, Martin Young, Duncan, A |
author_sort |
Parrenin, Frédéric |
title |
Is there 1.5-million-year-old ice near Dome C, Antarctica? |
title_short |
Is there 1.5-million-year-old ice near Dome C, Antarctica? |
title_full |
Is there 1.5-million-year-old ice near Dome C, Antarctica? |
title_fullStr |
Is there 1.5-million-year-old ice near Dome C, Antarctica? |
title_full_unstemmed |
Is there 1.5-million-year-old ice near Dome C, Antarctica? |
title_sort |
is there 1.5-million-year-old ice near dome c, antarctica? |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://hal.science/hal-02395950 https://hal.science/hal-02395950/document https://hal.science/hal-02395950/file/tc-11-2427-2017%20%281%29.pdf https://doi.org/10.5194/tc-11-2427-2017 |
genre |
Antarc* Antarctica EPICA ice core Ice Sheet The Cryosphere |
genre_facet |
Antarc* Antarctica EPICA ice core Ice Sheet The Cryosphere |
op_source |
ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://hal.science/hal-02395950 The Cryosphere, 2017, 11 (6), pp.2427-2437. ⟨10.5194/tc-11-2427-2017⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-11-2427-2017 hal-02395950 https://hal.science/hal-02395950 https://hal.science/hal-02395950/document https://hal.science/hal-02395950/file/tc-11-2427-2017%20%281%29.pdf doi:10.5194/tc-11-2427-2017 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/tc-11-2427-2017 |
container_title |
The Cryosphere |
container_volume |
11 |
container_issue |
6 |
container_start_page |
2427 |
op_container_end_page |
2437 |
_version_ |
1797572809669476352 |
spelling |
ftinsu:oai:HAL:hal-02395950v1 2024-04-28T08:00:43+00:00 Is there 1.5-million-year-old ice near Dome C, Antarctica? Parrenin, Frédéric Cavitte, Marie, M Blankenship, Donald, D Chappellaz, Jérôme Fischer, Hubertus Gagliardini, Olivier Masson-Delmotte, Valérie Passalacqua, Olivier Ritz, Catherine Roberts, Jason Siegert, Martin Young, Duncan, A Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) Institute for Geophysics University of Texas at Dallas Richardson (UT Dallas) Observatoire des Sciences de l'Univers de Grenoble (OSUG ) Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) Abteilung Klinische Sozialmedizin, Berufs- und Umweltdermatologie Universität Heidelberg Heidelberg = Heidelberg University Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Glaces et Continents, Climats et Isotopes Stables (GLACCIOS) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) The University of Queensland (UQ All campuses : Brisbane, Dutton Park Gatton, Herston, St Lucia and other locations ) 2017 https://hal.science/hal-02395950 https://hal.science/hal-02395950/document https://hal.science/hal-02395950/file/tc-11-2427-2017%20%281%29.pdf https://doi.org/10.5194/tc-11-2427-2017 en eng HAL CCSD Copernicus info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-11-2427-2017 hal-02395950 https://hal.science/hal-02395950 https://hal.science/hal-02395950/document https://hal.science/hal-02395950/file/tc-11-2427-2017%20%281%29.pdf doi:10.5194/tc-11-2427-2017 info:eu-repo/semantics/OpenAccess ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://hal.science/hal-02395950 The Cryosphere, 2017, 11 (6), pp.2427-2437. ⟨10.5194/tc-11-2427-2017⟩ [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology info:eu-repo/semantics/article Journal articles 2017 ftinsu https://doi.org/10.5194/tc-11-2427-2017 2024-04-05T00:38:39Z International audience Ice sheets provide exceptional archives of past changes in polar climate, regional environment and global atmospheric composition. The oldest dated deep ice core drilled in Antarctica has been retrieved at EPICA Dome C (EDC), reaching ∼ 800 000 years. Obtaining an older paleoclimatic record from Antarctica is one of the greatest challenges of the ice core community. Here, we use internal isochrones, identified from airborne radar coupled to ice-flow modelling to estimate the age of basal ice along transects in the Dome C area. Three glaciological properties are inferred from isochrones: surface accumulation rate, geothermal flux and the exponent of the Lliboutry velocity profile. We find that old ice (> 1.5 Myr, 1.5 million years) likely exists in two regions: one ∼ 40 km south-west of Dome C along the ice divide to Vostok, close to a secondary dome that we name "Little Dome C" (LDC), and a second region named "North Patch" (NP) located 10–30 km north-east of Dome C, in a region where the geothermal flux is apparently relatively low. Our work demonstrates the value of combining radar observations with ice flow modelling to accurately represent the true nature of ice flow, and understand the formation of ice-sheet architecture, in the centre of large ice sheets. Article in Journal/Newspaper Antarc* Antarctica EPICA ice core Ice Sheet The Cryosphere Institut national des sciences de l'Univers: HAL-INSU The Cryosphere 11 6 2427 2437 |