Basal age, surface accumulation, basal melting, geothermal flux and Lliboutry exponent of the velocity profile in the Dome C area, supplement to: Parrenin, Frédéric; Cavitte, Marie G P; Blankenship, Donald D; Chappellaz, Jérôme A; Fischer, Hubertus; Gagliardini, Olivier; Masson-Delmotte, Valerie; Passalacqua, Olivier; Ritz, Catherine; Roberts, Jason L; Siegert, Martin J; Young, Duncan A (2017): Is there 1.5-million-year-old ice near Dome C, Antarctica? The Cryosphere, 11(6), 2427-2437
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 Anta...
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ftdatacite:10.1594/pangaea.882249 2023-05-15T13:44:28+02:00 Basal age, surface accumulation, basal melting, geothermal flux and Lliboutry exponent of the velocity profile in the Dome C area, supplement to: Parrenin, Frédéric; Cavitte, Marie G P; Blankenship, Donald D; Chappellaz, Jérôme A; Fischer, Hubertus; Gagliardini, Olivier; Masson-Delmotte, Valerie; Passalacqua, Olivier; Ritz, Catherine; Roberts, Jason L; Siegert, Martin J; Young, Duncan A (2017): Is there 1.5-million-year-old ice near Dome C, Antarctica? The Cryosphere, 11(6), 2427-2437 Parrenin, Frédéric Cavitte, Marie G P Blankenship, Donald D Chappellaz, Jérôme A Fischer, Hubertus Gagliardini, Olivier Masson-Delmotte, Valerie Passalacqua, Olivier Ritz, Catherine Roberts, Jason L Siegert, Martin J Young, Duncan A 2017 text/tab-separated-values https://dx.doi.org/10.1594/pangaea.882249 https://doi.pangaea.de/10.1594/PANGAEA.882249 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.5194/tc-11-2427-2017 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY LONGITUDE LATITUDE Distance Ice thickness Accumulation rate in ice equivalent per year Accumulation rate, standard deviation Ground heat, flux Ground heat, flux, standard deviation Factor Standard deviation Melt rate Melt rate, standard deviation AGE Number of years Height Multiple investigations Supplementary Dataset Dataset dataset 2017 ftdatacite https://doi.org/10.1594/pangaea.882249 https://doi.org/10.5194/tc-11-2427-2017 2022-04-01T11:20:55Z 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 inverted from isochrones: surface accumulation rate; geothermal flux; and the exponent of the Lliboutry velocity profile. We find that old ice (>1 Myr, 1 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 the formation of ice-sheet architecture, in the centre of large ice sheets. Dataset Antarc* Antarctica EPICA ice core Ice Sheet DataCite Metadata Store (German National Library of Science and Technology) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
LONGITUDE LATITUDE Distance Ice thickness Accumulation rate in ice equivalent per year Accumulation rate, standard deviation Ground heat, flux Ground heat, flux, standard deviation Factor Standard deviation Melt rate Melt rate, standard deviation AGE Number of years Height Multiple investigations |
spellingShingle |
LONGITUDE LATITUDE Distance Ice thickness Accumulation rate in ice equivalent per year Accumulation rate, standard deviation Ground heat, flux Ground heat, flux, standard deviation Factor Standard deviation Melt rate Melt rate, standard deviation AGE Number of years Height Multiple investigations Parrenin, Frédéric Cavitte, Marie G P Blankenship, Donald D Chappellaz, Jérôme A Fischer, Hubertus Gagliardini, Olivier Masson-Delmotte, Valerie Passalacqua, Olivier Ritz, Catherine Roberts, Jason L Siegert, Martin J Young, Duncan A Basal age, surface accumulation, basal melting, geothermal flux and Lliboutry exponent of the velocity profile in the Dome C area, supplement to: Parrenin, Frédéric; Cavitte, Marie G P; Blankenship, Donald D; Chappellaz, Jérôme A; Fischer, Hubertus; Gagliardini, Olivier; Masson-Delmotte, Valerie; Passalacqua, Olivier; Ritz, Catherine; Roberts, Jason L; Siegert, Martin J; Young, Duncan A (2017): Is there 1.5-million-year-old ice near Dome C, Antarctica? The Cryosphere, 11(6), 2427-2437 |
topic_facet |
LONGITUDE LATITUDE Distance Ice thickness Accumulation rate in ice equivalent per year Accumulation rate, standard deviation Ground heat, flux Ground heat, flux, standard deviation Factor Standard deviation Melt rate Melt rate, standard deviation AGE Number of years Height Multiple investigations |
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 inverted from isochrones: surface accumulation rate; geothermal flux; and the exponent of the Lliboutry velocity profile. We find that old ice (>1 Myr, 1 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 the formation of ice-sheet architecture, in the centre of large ice sheets. |
format |
Dataset |
author |
Parrenin, Frédéric Cavitte, Marie G P Blankenship, Donald D Chappellaz, Jérôme A Fischer, Hubertus Gagliardini, Olivier Masson-Delmotte, Valerie Passalacqua, Olivier Ritz, Catherine Roberts, Jason L Siegert, Martin J Young, Duncan A |
author_facet |
Parrenin, Frédéric Cavitte, Marie G P Blankenship, Donald D Chappellaz, Jérôme A Fischer, Hubertus Gagliardini, Olivier Masson-Delmotte, Valerie Passalacqua, Olivier Ritz, Catherine Roberts, Jason L Siegert, Martin J Young, Duncan A |
author_sort |
Parrenin, Frédéric |
title |
Basal age, surface accumulation, basal melting, geothermal flux and Lliboutry exponent of the velocity profile in the Dome C area, supplement to: Parrenin, Frédéric; Cavitte, Marie G P; Blankenship, Donald D; Chappellaz, Jérôme A; Fischer, Hubertus; Gagliardini, Olivier; Masson-Delmotte, Valerie; Passalacqua, Olivier; Ritz, Catherine; Roberts, Jason L; Siegert, Martin J; Young, Duncan A (2017): Is there 1.5-million-year-old ice near Dome C, Antarctica? The Cryosphere, 11(6), 2427-2437 |
title_short |
Basal age, surface accumulation, basal melting, geothermal flux and Lliboutry exponent of the velocity profile in the Dome C area, supplement to: Parrenin, Frédéric; Cavitte, Marie G P; Blankenship, Donald D; Chappellaz, Jérôme A; Fischer, Hubertus; Gagliardini, Olivier; Masson-Delmotte, Valerie; Passalacqua, Olivier; Ritz, Catherine; Roberts, Jason L; Siegert, Martin J; Young, Duncan A (2017): Is there 1.5-million-year-old ice near Dome C, Antarctica? The Cryosphere, 11(6), 2427-2437 |
title_full |
Basal age, surface accumulation, basal melting, geothermal flux and Lliboutry exponent of the velocity profile in the Dome C area, supplement to: Parrenin, Frédéric; Cavitte, Marie G P; Blankenship, Donald D; Chappellaz, Jérôme A; Fischer, Hubertus; Gagliardini, Olivier; Masson-Delmotte, Valerie; Passalacqua, Olivier; Ritz, Catherine; Roberts, Jason L; Siegert, Martin J; Young, Duncan A (2017): Is there 1.5-million-year-old ice near Dome C, Antarctica? The Cryosphere, 11(6), 2427-2437 |
title_fullStr |
Basal age, surface accumulation, basal melting, geothermal flux and Lliboutry exponent of the velocity profile in the Dome C area, supplement to: Parrenin, Frédéric; Cavitte, Marie G P; Blankenship, Donald D; Chappellaz, Jérôme A; Fischer, Hubertus; Gagliardini, Olivier; Masson-Delmotte, Valerie; Passalacqua, Olivier; Ritz, Catherine; Roberts, Jason L; Siegert, Martin J; Young, Duncan A (2017): Is there 1.5-million-year-old ice near Dome C, Antarctica? The Cryosphere, 11(6), 2427-2437 |
title_full_unstemmed |
Basal age, surface accumulation, basal melting, geothermal flux and Lliboutry exponent of the velocity profile in the Dome C area, supplement to: Parrenin, Frédéric; Cavitte, Marie G P; Blankenship, Donald D; Chappellaz, Jérôme A; Fischer, Hubertus; Gagliardini, Olivier; Masson-Delmotte, Valerie; Passalacqua, Olivier; Ritz, Catherine; Roberts, Jason L; Siegert, Martin J; Young, Duncan A (2017): Is there 1.5-million-year-old ice near Dome C, Antarctica? The Cryosphere, 11(6), 2427-2437 |
title_sort |
basal age, surface accumulation, basal melting, geothermal flux and lliboutry exponent of the velocity profile in the dome c area, supplement to: parrenin, frédéric; cavitte, marie g p; blankenship, donald d; chappellaz, jérôme a; fischer, hubertus; gagliardini, olivier; masson-delmotte, valerie; passalacqua, olivier; ritz, catherine; roberts, jason l; siegert, martin j; young, duncan a (2017): is there 1.5-million-year-old ice near dome c, antarctica? the cryosphere, 11(6), 2427-2437 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
2017 |
url |
https://dx.doi.org/10.1594/pangaea.882249 https://doi.pangaea.de/10.1594/PANGAEA.882249 |
genre |
Antarc* Antarctica EPICA ice core Ice Sheet |
genre_facet |
Antarc* Antarctica EPICA ice core Ice Sheet |
op_relation |
https://dx.doi.org/10.5194/tc-11-2427-2017 |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.882249 https://doi.org/10.5194/tc-11-2427-2017 |
_version_ |
1766202130520080384 |