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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Online Access: | https://doi.org/10.5194/tc-11-2427-2017 https://doaj.org/article/1108b761237d415aa09f4a7e97984a01 |
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ftdoajarticles:oai:doaj.org/article:1108b761237d415aa09f4a7e97984a01 2023-05-15T13:44:30+02:00 Is there 1.5-million-year-old ice near Dome C, Antarctica? F. Parrenin M. G. P. Cavitte D. D. Blankenship J. Chappellaz H. Fischer O. Gagliardini V. Masson-Delmotte O. Passalacqua C. Ritz J. Roberts M. J. Siegert D. A. Young 2017-11-01T00:00:00Z https://doi.org/10.5194/tc-11-2427-2017 https://doaj.org/article/1108b761237d415aa09f4a7e97984a01 EN eng Copernicus Publications https://www.the-cryosphere.net/11/2427/2017/tc-11-2427-2017.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-11-2427-2017 1994-0416 1994-0424 https://doaj.org/article/1108b761237d415aa09f4a7e97984a01 The Cryosphere, Vol 11, Pp 2427-2437 (2017) Environmental sciences GE1-350 Geology QE1-996.5 article 2017 ftdoajarticles https://doi.org/10.5194/tc-11-2427-2017 2023-01-08T01:28:00Z 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 <q>Little Dome C</q> (LDC), and a second region named <q>North Patch</q> (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 Directory of Open Access Journals: DOAJ Articles The Cryosphere 11 6 2427 2437 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 F. Parrenin M. G. P. Cavitte D. D. Blankenship J. Chappellaz H. Fischer O. Gagliardini V. Masson-Delmotte O. Passalacqua C. Ritz J. Roberts M. J. Siegert D. A. Young Is there 1.5-million-year-old ice near Dome C, Antarctica? |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
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 <q>Little Dome C</q> (LDC), and a second region named <q>North Patch</q> (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 |
F. Parrenin M. G. P. Cavitte D. D. Blankenship J. Chappellaz H. Fischer O. Gagliardini V. Masson-Delmotte O. Passalacqua C. Ritz J. Roberts M. J. Siegert D. A. Young |
author_facet |
F. Parrenin M. G. P. Cavitte D. D. Blankenship J. Chappellaz H. Fischer O. Gagliardini V. Masson-Delmotte O. Passalacqua C. Ritz J. Roberts M. J. Siegert D. A. Young |
author_sort |
F. Parrenin |
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 Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/tc-11-2427-2017 https://doaj.org/article/1108b761237d415aa09f4a7e97984a01 |
genre |
Antarc* Antarctica EPICA ice core Ice Sheet The Cryosphere |
genre_facet |
Antarc* Antarctica EPICA ice core Ice Sheet The Cryosphere |
op_source |
The Cryosphere, Vol 11, Pp 2427-2437 (2017) |
op_relation |
https://www.the-cryosphere.net/11/2427/2017/tc-11-2427-2017.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-11-2427-2017 1994-0416 1994-0424 https://doaj.org/article/1108b761237d415aa09f4a7e97984a01 |
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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1766202545095573504 |