Stagnant ice and age modelling in the Dome C region, Antarctica
International audience Abstract. The European Beyond EPICA project aims to extract a continuous ice core of up to 1.5 Ma, with a maximum age density of 20 kyr m−1 at Little Dome C (LDC). We present a 1D numerical model which calculates the age of the ice around Dome C. The model inverts for basal co...
Published in: | The Cryosphere |
---|---|
Main Authors: | , , , , , , , , , , , , , , , |
Other Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2023
|
Subjects: | |
Online Access: | https://hal.science/hal-04235007 https://hal.science/hal-04235007/document https://hal.science/hal-04235007/file/tc-17-3461-2023.pdf https://doi.org/10.5194/tc-17-3461-2023 |
id |
ftccsdartic:oai:HAL:hal-04235007v1 |
---|---|
record_format |
openpolar |
spelling |
ftccsdartic:oai:HAL:hal-04235007v1 2023-12-17T10:21:46+01:00 Stagnant ice and age modelling in the Dome C region, Antarctica Chung, Ailsa Parrenin, Frédéric Steinhage, Daniel Mulvaney, Robert Martín, Carlos Cavitte, Marie, G P Lilien, David, A Helm, Veit Taylor, Drew Gogineni, Prasad Ritz, Catherine Frezzotti, Massimo O'Neill, Charles Miller, Heinrich Dahl-Jensen, Dorthe 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) ITN DEEPICE 2023 https://hal.science/hal-04235007 https://hal.science/hal-04235007/document https://hal.science/hal-04235007/file/tc-17-3461-2023.pdf https://doi.org/10.5194/tc-17-3461-2023 en eng HAL CCSD Copernicus info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-17-3461-2023 hal-04235007 https://hal.science/hal-04235007 https://hal.science/hal-04235007/document https://hal.science/hal-04235007/file/tc-17-3461-2023.pdf doi:10.5194/tc-17-3461-2023 info:eu-repo/semantics/OpenAccess ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://hal.science/hal-04235007 The Cryosphere, 2023, 17 (8), pp.3461-3483. ⟨10.5194/tc-17-3461-2023⟩ [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology info:eu-repo/semantics/article Journal articles 2023 ftccsdartic https://doi.org/10.5194/tc-17-3461-2023 2023-11-18T23:42:37Z International audience Abstract. The European Beyond EPICA project aims to extract a continuous ice core of up to 1.5 Ma, with a maximum age density of 20 kyr m−1 at Little Dome C (LDC). We present a 1D numerical model which calculates the age of the ice around Dome C. The model inverts for basal conditions and accounts either for melting or for a layer of stagnant ice above the bedrock. It is constrained by internal reflecting horizons traced in radargrams and dated using the EPICA Dome C (EDC) ice core age profile. We used three different radar datasets ranging from a 10 000 km2 airborne survey down to 5 km long ground-based radar transects over LDC. We find that stagnant ice exists in many places, including above the LDC relief where the new Beyond EPICA drill site (BELDC) is located. The modelled thickness of this layer of stagnant ice roughly corresponds to the thickness of the basal unit observed in one of the radar surveys and in the autonomous phase-sensitive radio-echo sounder (ApRES) dataset. At BELDC, the modelled stagnant ice thickness is 198±44 m and the modelled oldest age of ice is 1.45±0.16 Ma at a depth of 2494±30 m. This is very similar to all sites situated on the LDC relief, including that of the Million Year Ice Core project being conducted by the Australian Antarctic Division. The model was also applied to radar data in the area 10–15 km north of EDC (North Patch), where we find either a thin layer of stagnant ice (generally <60 m) or a negligible melt rate (<0.1 mm yr−1). The modelled maximum age at North Patch is over 2 Ma in most places, with ice at 1.5 Ma having a resolution of 9–12 kyr m−1, making it an exciting prospect for a future Oldest Ice drill site. Article in Journal/Newspaper Antarc* Antarctic Antarctica Australian Antarctic Division EPICA ice core The Cryosphere Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic The Cryosphere 17 8 3461 3483 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
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 Chung, Ailsa Parrenin, Frédéric Steinhage, Daniel Mulvaney, Robert Martín, Carlos Cavitte, Marie, G P Lilien, David, A Helm, Veit Taylor, Drew Gogineni, Prasad Ritz, Catherine Frezzotti, Massimo O'Neill, Charles Miller, Heinrich Dahl-Jensen, Dorthe Eisen, Olaf Stagnant ice and age modelling in the Dome C region, Antarctica |
topic_facet |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
description |
International audience Abstract. The European Beyond EPICA project aims to extract a continuous ice core of up to 1.5 Ma, with a maximum age density of 20 kyr m−1 at Little Dome C (LDC). We present a 1D numerical model which calculates the age of the ice around Dome C. The model inverts for basal conditions and accounts either for melting or for a layer of stagnant ice above the bedrock. It is constrained by internal reflecting horizons traced in radargrams and dated using the EPICA Dome C (EDC) ice core age profile. We used three different radar datasets ranging from a 10 000 km2 airborne survey down to 5 km long ground-based radar transects over LDC. We find that stagnant ice exists in many places, including above the LDC relief where the new Beyond EPICA drill site (BELDC) is located. The modelled thickness of this layer of stagnant ice roughly corresponds to the thickness of the basal unit observed in one of the radar surveys and in the autonomous phase-sensitive radio-echo sounder (ApRES) dataset. At BELDC, the modelled stagnant ice thickness is 198±44 m and the modelled oldest age of ice is 1.45±0.16 Ma at a depth of 2494±30 m. This is very similar to all sites situated on the LDC relief, including that of the Million Year Ice Core project being conducted by the Australian Antarctic Division. The model was also applied to radar data in the area 10–15 km north of EDC (North Patch), where we find either a thin layer of stagnant ice (generally <60 m) or a negligible melt rate (<0.1 mm yr−1). The modelled maximum age at North Patch is over 2 Ma in most places, with ice at 1.5 Ma having a resolution of 9–12 kyr m−1, making it an exciting prospect for a future Oldest Ice drill site. |
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) ITN DEEPICE |
format |
Article in Journal/Newspaper |
author |
Chung, Ailsa Parrenin, Frédéric Steinhage, Daniel Mulvaney, Robert Martín, Carlos Cavitte, Marie, G P Lilien, David, A Helm, Veit Taylor, Drew Gogineni, Prasad Ritz, Catherine Frezzotti, Massimo O'Neill, Charles Miller, Heinrich Dahl-Jensen, Dorthe Eisen, Olaf |
author_facet |
Chung, Ailsa Parrenin, Frédéric Steinhage, Daniel Mulvaney, Robert Martín, Carlos Cavitte, Marie, G P Lilien, David, A Helm, Veit Taylor, Drew Gogineni, Prasad Ritz, Catherine Frezzotti, Massimo O'Neill, Charles Miller, Heinrich Dahl-Jensen, Dorthe Eisen, Olaf |
author_sort |
Chung, Ailsa |
title |
Stagnant ice and age modelling in the Dome C region, Antarctica |
title_short |
Stagnant ice and age modelling in the Dome C region, Antarctica |
title_full |
Stagnant ice and age modelling in the Dome C region, Antarctica |
title_fullStr |
Stagnant ice and age modelling in the Dome C region, Antarctica |
title_full_unstemmed |
Stagnant ice and age modelling in the Dome C region, Antarctica |
title_sort |
stagnant ice and age modelling in the dome c region, antarctica |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://hal.science/hal-04235007 https://hal.science/hal-04235007/document https://hal.science/hal-04235007/file/tc-17-3461-2023.pdf https://doi.org/10.5194/tc-17-3461-2023 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctica Australian Antarctic Division EPICA ice core The Cryosphere |
genre_facet |
Antarc* Antarctic Antarctica Australian Antarctic Division EPICA ice core The Cryosphere |
op_source |
ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://hal.science/hal-04235007 The Cryosphere, 2023, 17 (8), pp.3461-3483. ⟨10.5194/tc-17-3461-2023⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-17-3461-2023 hal-04235007 https://hal.science/hal-04235007 https://hal.science/hal-04235007/document https://hal.science/hal-04235007/file/tc-17-3461-2023.pdf doi:10.5194/tc-17-3461-2023 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/tc-17-3461-2023 |
container_title |
The Cryosphere |
container_volume |
17 |
container_issue |
8 |
container_start_page |
3461 |
op_container_end_page |
3483 |
_version_ |
1785538626187165696 |