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

Citation

Parrenin, F and Cavitte, MGP and Blankenship, DD and Chappellaz, J and Fischer, H and Gagliardini, O and Masson-Delmotte, V and Passalacqua, O and Ritz, C and Roberts, J and Siegert, MJ and Young, DA, Is there 1.5-million-year-old ice near Dome C, Antarctica?, Cryosphere, 11, (6) pp. 2427-2437. ISSN 1994-0416 (2017) [Refereed Article]


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ę 2017 The Authors. Licensed under Creative Commons Attribution 3.0 Unported (CC BY 3.0) https://creativecommons.org/licenses/by/3.0/

DOI: doi:10.5194/tc-11-2427-2017

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 DomeáCá(EDC), reaching ∼ 800 000áyears. 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 DomeáC 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, 1.5ámillion years) likely exists in two regions: one ∼ 40 km south-west of DomeáC along the ice divide to Vostok, close to a secondary dome that we name Little DomeáCá(LDC), and a second region named North Patchá(NP) located 10ľ30 km north-east of DomeáC, 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.

Item Details

Item Type:Refereed Article
Keywords:ice, Dome C, Antarctica
Research Division:Earth Sciences
Research Group:Physical Geography and Environmental Geoscience
Research Field:Physical Geography and Environmental Geoscience not elsewhere classified
Objective Division:Environment
Objective Group:Ecosystem Assessment and Management
Objective Field:Ecosystem Assessment and Management of Antarctic and Sub-Antarctic Environments
UTAS Author:Roberts, J (Dr Jason Roberts)
ID Code:125813
Year Published:2017
Web of Science® Times Cited:12
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2018-05-08
Last Modified:2018-07-26
Downloads:48 View Download Statistics

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