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Is there 1.5-million-year-old ice near Dome C, Antarctica?

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Parrenin Frédéric, Cavitte Marie G. P., Blankenship Donald D., Chappellaz Jérôme, Fischer Hubertus, Gagliardini Olivier, Masson-Delmotte Valérie, Passalacqua Olivier, Ritz Catherine, Roberts Jason, Siegert Martin J., Young Duncan A.,
Project iCEP - Climate and Environmental Physics: Innovation in ice core science
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Original article (peer-reviewed)

Journal The Cryosphere
Volume (Issue) 11(6)
Page(s) 2427 - 2437
Title of proceedings The Cryosphere

Open Access

URL http://doi.org/10.5194/tc-11-2427-2017
Type of Open Access Publisher (Gold Open Access)

Abstract

Abstract. 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.
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