Is there 1.5-million-year-old ice near Dome C, Antarctica?
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 Ant...
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ftunivtasmania:oai:eprints.utas.edu.au:27297 2023-05-15T13:31:53+02:00 Is there 1.5-million-year-old ice near Dome C, Antarctica? Parrenin, F Cavitte, MGP Blankenship, DD Chappellaz, J Fischer, H Gagliardini, O Masson-Delmotte, V Passalacqua, O Ritz, C Roberts, J Siegert, MJ Young, DA 2017 application/pdf https://eprints.utas.edu.au/27297/ https://eprints.utas.edu.au/27297/1/Parennin%20et%20al%202017.pdf en eng Copernicus GmbH https://eprints.utas.edu.au/27297/1/Parennin%20et%20al%202017.pdf Parrenin, F, Cavitte, MGP, Blankenship, DD, Chappellaz, J, Fischer, H, Gagliardini, O, Masson-Delmotte, V, Passalacqua, O, Ritz, C, Roberts, J, Siegert, MJ and Young, DA 2017 , 'Is there 1.5-million-year-old ice near Dome C, Antarctica?' , Cryosphere, vol. 11, no. 6 , pp. 2427-2437 , doi:10.5194/tc-11-2427-2017 <http://dx.doi.org/10.5194/tc-11-2427-2017>. ice Dome C Antarctica Article PeerReviewed 2017 ftunivtasmania 2021-09-13T22:18:06Z 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 University of Tasmania: UTas ePrints The Cryosphere 11 6 2427 2437 |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
English |
topic |
ice Dome C Antarctica |
spellingShingle |
ice Dome C Antarctica Parrenin, F Cavitte, MGP Blankenship, DD Chappellaz, J Fischer, H Gagliardini, O Masson-Delmotte, V Passalacqua, O Ritz, C Roberts, J Siegert, MJ Young, DA Is there 1.5-million-year-old ice near Dome C, Antarctica? |
topic_facet |
ice Dome C Antarctica |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Parrenin, F Cavitte, MGP Blankenship, DD Chappellaz, J Fischer, H Gagliardini, O Masson-Delmotte, V Passalacqua, O Ritz, C Roberts, J Siegert, MJ Young, DA |
author_facet |
Parrenin, F Cavitte, MGP Blankenship, DD Chappellaz, J Fischer, H Gagliardini, O Masson-Delmotte, V Passalacqua, O Ritz, C Roberts, J Siegert, MJ Young, DA |
author_sort |
Parrenin, F |
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 |
Copernicus GmbH |
publishDate |
2017 |
url |
https://eprints.utas.edu.au/27297/ https://eprints.utas.edu.au/27297/1/Parennin%20et%20al%202017.pdf |
genre |
Antarc* Antarctica EPICA ice core Ice Sheet |
genre_facet |
Antarc* Antarctica EPICA ice core Ice Sheet |
op_relation |
https://eprints.utas.edu.au/27297/1/Parennin%20et%20al%202017.pdf Parrenin, F, Cavitte, MGP, Blankenship, DD, Chappellaz, J, Fischer, H, Gagliardini, O, Masson-Delmotte, V, Passalacqua, O, Ritz, C, Roberts, J, Siegert, MJ and Young, DA 2017 , 'Is there 1.5-million-year-old ice near Dome C, Antarctica?' , Cryosphere, vol. 11, no. 6 , pp. 2427-2437 , doi:10.5194/tc-11-2427-2017 <http://dx.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_ |
1766021827163848704 |