Basal age, surface accumulation, basal melting, geothermal flux and Lliboutry exponent of the velocity profile in the Dome C area
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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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.882249 2023-05-15T13:58:16+02:00 Basal age, surface accumulation, basal melting, geothermal flux and Lliboutry exponent of the velocity profile in the Dome C area 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 MEDIAN LATITUDE: -75.501334 * MEDIAN LONGITUDE: 121.726843 * SOUTH-BOUND LATITUDE: -77.048737 * WEST-BOUND LONGITUDE: 112.418242 * NORTH-BOUND LATITUDE: -73.770612 * EAST-BOUND LONGITUDE: 127.557975 2017-10-30 text/tab-separated-values, 95189 data points https://doi.pangaea.de/10.1594/PANGAEA.882249 https://doi.org/10.1594/PANGAEA.882249 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.882249 https://doi.org/10.1594/PANGAEA.882249 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY 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, https://doi.org/10.5194/tc-11-2427-2017 Accumulation rate standard deviation Accumulation rate in ice equivalent per year AGE Antarctica Distance DomeC_area Factor Ground heat flux Height Ice thickness LATITUDE LONGITUDE Melt rate MULT Multiple investigations Number of years Dataset 2017 ftpangaea https://doi.org/10.1594/PANGAEA.882249 https://doi.org/10.5194/tc-11-2427-2017 2023-01-20T09:09:52Z 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 The Cryosphere PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(112.418242,127.557975,-73.770612,-77.048737) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Accumulation rate standard deviation Accumulation rate in ice equivalent per year AGE Antarctica Distance DomeC_area Factor Ground heat flux Height Ice thickness LATITUDE LONGITUDE Melt rate MULT Multiple investigations Number of years |
spellingShingle |
Accumulation rate standard deviation Accumulation rate in ice equivalent per year AGE Antarctica Distance DomeC_area Factor Ground heat flux Height Ice thickness LATITUDE LONGITUDE Melt rate MULT Multiple investigations Number of years 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 |
topic_facet |
Accumulation rate standard deviation Accumulation rate in ice equivalent per year AGE Antarctica Distance DomeC_area Factor Ground heat flux Height Ice thickness LATITUDE LONGITUDE Melt rate MULT Multiple investigations Number of years |
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 |
title_short |
Basal age, surface accumulation, basal melting, geothermal flux and Lliboutry exponent of the velocity profile in the Dome C area |
title_full |
Basal age, surface accumulation, basal melting, geothermal flux and Lliboutry exponent of the velocity profile in the Dome C area |
title_fullStr |
Basal age, surface accumulation, basal melting, geothermal flux and Lliboutry exponent of the velocity profile in the Dome C area |
title_full_unstemmed |
Basal age, surface accumulation, basal melting, geothermal flux and Lliboutry exponent of the velocity profile in the Dome C area |
title_sort |
basal age, surface accumulation, basal melting, geothermal flux and lliboutry exponent of the velocity profile in the dome c area |
publisher |
PANGAEA |
publishDate |
2017 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.882249 https://doi.org/10.1594/PANGAEA.882249 |
op_coverage |
MEDIAN LATITUDE: -75.501334 * MEDIAN LONGITUDE: 121.726843 * SOUTH-BOUND LATITUDE: -77.048737 * WEST-BOUND LONGITUDE: 112.418242 * NORTH-BOUND LATITUDE: -73.770612 * EAST-BOUND LONGITUDE: 127.557975 |
long_lat |
ENVELOPE(112.418242,127.557975,-73.770612,-77.048737) |
genre |
Antarc* Antarctica EPICA ice core Ice Sheet The Cryosphere |
genre_facet |
Antarc* Antarctica EPICA ice core Ice Sheet The Cryosphere |
op_source |
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, https://doi.org/10.5194/tc-11-2427-2017 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.882249 https://doi.org/10.1594/PANGAEA.882249 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.882249 https://doi.org/10.5194/tc-11-2427-2017 |
_version_ |
1766266487475011584 |