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 DomeC(EDC), reaching ∼ 800 000years. Obtaining an older paleoclimatic record from Antarc...
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Online Access: | https://doi.org/10.5194/tc-11-2427-2017 http://ecite.utas.edu.au/125813 |
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ftunivtasecite:oai:ecite.utas.edu.au:125813 2023-05-15T13:55:18+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://doi.org/10.5194/tc-11-2427-2017 http://ecite.utas.edu.au/125813 en eng Copernicus GmbH http://ecite.utas.edu.au/125813/1/Parennin et al 2017.pdf http://dx.doi.org/10.5194/tc-11-2427-2017 Parrenin, F and Cavitte, MGP and Blankenship, DD and Chappellaz, J and Fischer, H and Gagliardini, O and Masson-Delmotte, V and Passalacqua, O and Ritz, C and Roberts, J and Siegert, MJ and Young, DA, Is there 1.5-million-year-old ice near Dome C, Antarctica?, Cryosphere, 11, (6) pp. 2427-2437. ISSN 1994-0416 (2017) [Refereed Article] http://ecite.utas.edu.au/125813 Earth Sciences Physical Geography and Environmental Geoscience Physical Geography and Environmental Geoscience not elsewhere classified Refereed Article PeerReviewed 2017 ftunivtasecite https://doi.org/10.5194/tc-11-2427-2017 2019-12-13T22:24:18Z 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 DomeC(EDC), reaching ∼ 800 000years. 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 DomeC 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, 1.5million years) likely exists in two regions: one ∼ 40 km south-west of DomeC along the ice divide to Vostok, close to a secondary dome that we name <q>Little DomeC</q>(LDC), and a second region named <q>North Patch</q>(NP) located 1030 km north-east of DomeC, 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 eCite UTAS (University of Tasmania) The Cryosphere 11 6 2427 2437 |
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Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Physical Geography and Environmental Geoscience Physical Geography and Environmental Geoscience not elsewhere classified |
spellingShingle |
Earth Sciences Physical Geography and Environmental Geoscience Physical Geography and Environmental Geoscience not elsewhere classified 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 |
Earth Sciences Physical Geography and Environmental Geoscience Physical Geography and Environmental Geoscience not elsewhere classified |
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 DomeC(EDC), reaching ∼ 800 000years. 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 DomeC 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, 1.5million years) likely exists in two regions: one ∼ 40 km south-west of DomeC along the ice divide to Vostok, close to a secondary dome that we name <q>Little DomeC</q>(LDC), and a second region named <q>North Patch</q>(NP) located 1030 km north-east of DomeC, 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://doi.org/10.5194/tc-11-2427-2017 http://ecite.utas.edu.au/125813 |
genre |
Antarc* Antarctica EPICA ice core Ice Sheet |
genre_facet |
Antarc* Antarctica EPICA ice core Ice Sheet |
op_relation |
http://ecite.utas.edu.au/125813/1/Parennin et al 2017.pdf http://dx.doi.org/10.5194/tc-11-2427-2017 Parrenin, F and Cavitte, MGP and Blankenship, DD and Chappellaz, J and Fischer, H and Gagliardini, O and Masson-Delmotte, V and Passalacqua, O and Ritz, C and Roberts, J and Siegert, MJ and Young, DA, Is there 1.5-million-year-old ice near Dome C, Antarctica?, Cryosphere, 11, (6) pp. 2427-2437. ISSN 1994-0416 (2017) [Refereed Article] http://ecite.utas.edu.au/125813 |
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 |
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1766261675868028928 |