Stagnant ice and age modelling in the Dome C region, Antarctica
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...
Published in: | The Cryosphere |
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Copernicus Publications
2023
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Online Access: | https://epic.awi.de/id/eprint/58071/ https://epic.awi.de/id/eprint/58071/1/tc-17-3461-2023.pdf https://doi.org/10.5194/tc-17-3461-2023 https://hdl.handle.net/10013/epic.693de4fa-dcf7-4afb-ba8b-cd0584c26993 |
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ftawi:oai:epic.awi.de:58071 2023-11-12T04:06:19+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 GP Lilien, David A Helm, Veit Taylor, Drew Gogineni, Prasad Ritz, Catherine Frezzotti, Massimo O'Neill, Charles Miller, Heinrich Dahl-Jensen, Dorthe Eisen, Olaf 2023-08-24 application/pdf https://epic.awi.de/id/eprint/58071/ https://epic.awi.de/id/eprint/58071/1/tc-17-3461-2023.pdf https://doi.org/10.5194/tc-17-3461-2023 https://hdl.handle.net/10013/epic.693de4fa-dcf7-4afb-ba8b-cd0584c26993 unknown Copernicus Publications https://epic.awi.de/id/eprint/58071/1/tc-17-3461-2023.pdf Chung, A. , Parrenin, F. , Steinhage, D. orcid:0000-0003-4737-9751 , Mulvaney, R. , Martín, C. , Cavitte, M. G. , Lilien, D. A. , Helm, V. orcid:0000-0001-7788-9328 , Taylor, D. , Gogineni, P. , Ritz, C. , Frezzotti, M. , O'Neill, C. , Miller, H. , Dahl-Jensen, D. and Eisen, O. orcid:0000-0002-6380-962X (2023) Stagnant ice and age modelling in the Dome C region, Antarctica , The Cryosphere, 17 (8), pp. 3461-3483 . doi:10.5194/tc-17-3461-2023 <https://doi.org/10.5194/tc-17-3461-2023> , hdl:10013/epic.693de4fa-dcf7-4afb-ba8b-cd0584c26993 EPIC3The Cryosphere, Copernicus Publications, 17(8), pp. 3461-3483, ISSN: 1994-0416 Article isiRev 2023 ftawi https://doi.org/10.5194/tc-17-3461-2023 2023-10-22T23:23:01Z 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 Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic The Cryosphere 17 8 3461 3483 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Chung, Ailsa Parrenin, Frédéric Steinhage, Daniel Mulvaney, Robert Martín, Carlos Cavitte, Marie GP Lilien, David A Helm, Veit Taylor, Drew Gogineni, Prasad Ritz, Catherine Frezzotti, Massimo O'Neill, Charles Miller, Heinrich Dahl-Jensen, Dorthe Eisen, Olaf |
spellingShingle |
Chung, Ailsa Parrenin, Frédéric Steinhage, Daniel Mulvaney, Robert Martín, Carlos Cavitte, Marie GP 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 |
author_facet |
Chung, Ailsa Parrenin, Frédéric Steinhage, Daniel Mulvaney, Robert Martín, Carlos Cavitte, Marie GP 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 |
Copernicus Publications |
publishDate |
2023 |
url |
https://epic.awi.de/id/eprint/58071/ https://epic.awi.de/id/eprint/58071/1/tc-17-3461-2023.pdf https://doi.org/10.5194/tc-17-3461-2023 https://hdl.handle.net/10013/epic.693de4fa-dcf7-4afb-ba8b-cd0584c26993 |
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 |
EPIC3The Cryosphere, Copernicus Publications, 17(8), pp. 3461-3483, ISSN: 1994-0416 |
op_relation |
https://epic.awi.de/id/eprint/58071/1/tc-17-3461-2023.pdf Chung, A. , Parrenin, F. , Steinhage, D. orcid:0000-0003-4737-9751 , Mulvaney, R. , Martín, C. , Cavitte, M. G. , Lilien, D. A. , Helm, V. orcid:0000-0001-7788-9328 , Taylor, D. , Gogineni, P. , Ritz, C. , Frezzotti, M. , O'Neill, C. , Miller, H. , Dahl-Jensen, D. and Eisen, O. orcid:0000-0002-6380-962X (2023) Stagnant ice and age modelling in the Dome C region, Antarctica , The Cryosphere, 17 (8), pp. 3461-3483 . doi:10.5194/tc-17-3461-2023 <https://doi.org/10.5194/tc-17-3461-2023> , hdl:10013/epic.693de4fa-dcf7-4afb-ba8b-cd0584c26993 |
op_doi |
https://doi.org/10.5194/tc-17-3461-2023 |
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The Cryosphere |
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17 |
container_issue |
8 |
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3461 |
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3483 |
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