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...
Published in: | The Cryosphere |
---|---|
Main Authors: | , , , , , , , , , , , |
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Copernicus Publications
2017
|
Subjects: | |
Online Access: | http://hdl.handle.net/10044/1/53057 https://doi.org/10.5194/tc-11-2427-2017 |
id |
ftimperialcol:oai:spiral.imperial.ac.uk:10044/1/53057 |
---|---|
record_format |
openpolar |
spelling |
ftimperialcol:oai:spiral.imperial.ac.uk:10044/1/53057 2023-05-15T13:54:42+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 Siegert, MJ Roberts, J Young, DA British Council (UK) 2017-09-11 http://hdl.handle.net/10044/1/53057 https://doi.org/10.5194/tc-11-2427-2017 unknown Copernicus Publications The Cryosphere © Author(s) 2017. This work is distributed under the Creative Commons Attribution 3.0 License. CC-BY 2437 2427 Science & Technology Physical Sciences Geography Physical Geosciences Multidisciplinary Physical Geography Geology CARBON-DIOXIDE CONCENTRATION 100,000-YEAR GLACIAL CYCLES PAST 800,000 YEARS OLD ICE MIDPLEISTOCENE TRANSITION CHRONOLOGY AICC2012 MILLENNIAL-SCALE SUBGLACIAL LAKES EAST ANTARCTICA VOLUME 0405 Oceanography 0406 Physical Geography And Environmental Geoscience Meteorology & Atmospheric Sciences Journal Article 2017 ftimperialcol https://doi.org/10.5194/tc-11-2427-2017 2018-09-16T06:00:54Z 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 East Antarctica EPICA ice core Ice Sheet The Cryosphere Imperial College London: Spiral East Antarctica The Cryosphere 11 6 2427 2437 |
institution |
Open Polar |
collection |
Imperial College London: Spiral |
op_collection_id |
ftimperialcol |
language |
unknown |
topic |
Science & Technology Physical Sciences Geography Physical Geosciences Multidisciplinary Physical Geography Geology CARBON-DIOXIDE CONCENTRATION 100,000-YEAR GLACIAL CYCLES PAST 800,000 YEARS OLD ICE MIDPLEISTOCENE TRANSITION CHRONOLOGY AICC2012 MILLENNIAL-SCALE SUBGLACIAL LAKES EAST ANTARCTICA VOLUME 0405 Oceanography 0406 Physical Geography And Environmental Geoscience Meteorology & Atmospheric Sciences |
spellingShingle |
Science & Technology Physical Sciences Geography Physical Geosciences Multidisciplinary Physical Geography Geology CARBON-DIOXIDE CONCENTRATION 100,000-YEAR GLACIAL CYCLES PAST 800,000 YEARS OLD ICE MIDPLEISTOCENE TRANSITION CHRONOLOGY AICC2012 MILLENNIAL-SCALE SUBGLACIAL LAKES EAST ANTARCTICA VOLUME 0405 Oceanography 0406 Physical Geography And Environmental Geoscience Meteorology & Atmospheric Sciences Parrenin, F Cavitte, MGP Blankenship, DD Chappellaz, J Fischer, H Gagliardini, O Masson-Delmotte, V Passalacqua, O Ritz, C Siegert, MJ Roberts, J Young, DA Is there 1.5 million-year old ice near Dome C, Antarctica? |
topic_facet |
Science & Technology Physical Sciences Geography Physical Geosciences Multidisciplinary Physical Geography Geology CARBON-DIOXIDE CONCENTRATION 100,000-YEAR GLACIAL CYCLES PAST 800,000 YEARS OLD ICE MIDPLEISTOCENE TRANSITION CHRONOLOGY AICC2012 MILLENNIAL-SCALE SUBGLACIAL LAKES EAST ANTARCTICA VOLUME 0405 Oceanography 0406 Physical Geography And Environmental Geoscience Meteorology & Atmospheric Sciences |
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. |
author2 |
British Council (UK) |
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 Siegert, MJ Roberts, J Young, DA |
author_facet |
Parrenin, F Cavitte, MGP Blankenship, DD Chappellaz, J Fischer, H Gagliardini, O Masson-Delmotte, V Passalacqua, O Ritz, C Siegert, MJ Roberts, J 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 Publications |
publishDate |
2017 |
url |
http://hdl.handle.net/10044/1/53057 https://doi.org/10.5194/tc-11-2427-2017 |
geographic |
East Antarctica |
geographic_facet |
East Antarctica |
genre |
Antarc* Antarctica East Antarctica EPICA ice core Ice Sheet The Cryosphere |
genre_facet |
Antarc* Antarctica East Antarctica EPICA ice core Ice Sheet The Cryosphere |
op_source |
2437 2427 |
op_relation |
The Cryosphere |
op_rights |
© Author(s) 2017. This work is distributed under the Creative Commons Attribution 3.0 License. |
op_rightsnorm |
CC-BY |
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 |
_version_ |
1766260780415582208 |