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

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Title: Is there 1.5 million-year old ice near Dome C, Antarctica?
Author(s): 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
Item Type: Journal Article
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.
Publication Date: 2-Nov-2017
Date of Acceptance: 11-Sep-2017
URI: http://hdl.handle.net/10044/1/53057
DOI: https://dx.doi.org/10.5194/tc-11-2427-2017
ISSN: 1994-0416
Publisher: Copernicus Publications
Start Page: 2427
End Page: 2437
Journal / Book Title: The Cryosphere
Volume: 11
Sponsor/Funder: British Council (UK)
Funder's Grant Number: ICECAP-2
Copyright Statement: © Author(s) 2017. This work is distributed under the Creative Commons Attribution 3.0 License.
Keywords: 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
Publication Status: Published online
Appears in Collections:Centre for Environmental Policy
Faculty of Natural Sciences



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