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

Citation

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, High-resolution boundary conditions of an old ice target near Dome C, Antarctica, Cryosphere, 11, (4) pp. 1897-1911. ISSN 1994-0416 (2017) [Refereed Article]


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DOI: doi:10.5194/tc-11-1897-2017

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 We combined new ice thickness data derived from an airborne coherent radar sounder with unpublished data that was in part unavailable for earlier compilations, and we were able to remove older data with high positional uncertainties.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 Details

Item Type:Refereed Article
Keywords:glaciology, Antarctica
Research Division:Earth Sciences
Research Group:Physical Geography and Environmental Geoscience
Research Field:Glaciology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:Roberts, JL (Dr Jason Roberts)
Author:Tozer, CR (Dr Carly Tozer)
Author:van Ommen, TD (Dr Tas van Ommen)
ID Code:122568
Year Published:2017
Web of Science® Times Cited:1
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2017-11-17
Last Modified:2017-11-20
Downloads:0

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