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High-resolution boundary conditions of an old ice target near Dome C, Antarctica

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Young, DA, Roberts, JL, Ritz, C, Frezzotti, M, Quartini, E, Cavitte, MGP, Tozer, CR ORCID: 0000-0001-8605-5907, Steinhage, D, Urbini, S, Corr, HFJ, van Ommen, TD ORCID: 0000-0002-2463-1718 and Blankenship, DD 2017 , 'High-resolution boundary conditions of an old ice target near Dome C, Antarctica' , Cryosphere, vol. 11, no. 4 , pp. 1897-1911 , doi: 10.5194/tc-11-1897-2017.

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Abstract

A high-resolution (1 km line spacing) aerogeophysical survey was conducted over a region near the East Antarctic Ice Sheet's Dome C that may hold a 1.5 Myr climate record. We combined new ice thickness data derived from an airborne coherent radar sounder with unpublished data that was in part unavailable for earlier compilations, and we were able to remove older data with high positional uncertainties. We generated a revised high-resolution digital elevation model (DEM) to investigate the potential for an old ice record in this region, and used laser altimetry to confirm a Cryosat-2 derived DEM for inferring the glaciological state of the candidate area. By measuring the specularity content of the bed, we were able to find an additional 50 subglacial lakes near the candidate site, and by Doppler focusing the radar data, we were able to map out the roughness of the bed at length scales of hundreds of meters.We find that the primary candidate region contains elevated rough topography interspersed with scattered subglacial lakes and some regions of smoother bed. Free subglacial water appears to be restricted from bed overlain by ice thicknesses of less than 3000 m. A site near the ice divide was selected for further investigation. The high resolution of this ice thickness data set also allows us to explore the nature of ice thickness uncertainties in the context of radar geometry and processing.

Item Type: Article
Authors/Creators:Young, DA and Roberts, JL and Ritz, C and Frezzotti, M and Quartini, E and Cavitte, MGP and Tozer, CR and Steinhage, D and Urbini, S and Corr, HFJ and van Ommen, TD and Blankenship, DD
Keywords: glaciology, Antarctica, boundary conditions, Dome C, ice thickness, sub-glacial lake
Journal or Publication Title: Cryosphere
Publisher: Copernicus GmbH
ISSN: 1994-0416
DOI / ID Number: 10.5194/tc-11-1897-2017
Copyright Information:

© Author(s) 2017. Licensed under Creative Commons Attribution 3.0 Unported (CC BY 3.0) http://creativecommons.org/licenses/by/3.0/

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