A high-resolution synthetic bed elevation grid of the Antarctic continent
Felicity S. Graham1, Jason L. Roberts2,3, Ben K. Galton-Fenzi2,3, Duncan Young4, Donald Blankenship4, and Martin J. Siegert51Institute for Marine and Antarctic Studies, University of Tasmania, Private Bag 129, Hobart, Tasmania 7001, Australia 2Department of the Environment, Australian Antarctic Division, Hobart, Tasmania, Australia 3Antarctic Climate and Ecosystems Cooperative Research Centre, Private Bag 80, Hobart, Tasmania 7001, Australia 4Institute for Geophysics, University of Texas at Austin, Austin, Texas 78758, USA 5Grantham Institute and Department of Earth Sciences and Engineering, Imperial College London, London SW7 2AZ, UK
Received: 13 May 2016 – Accepted for review: 23 Jun 2016 – Discussion started: 04 Jul 2016
Abstract. Digital elevation models of Antarctic bed topography are heavily smoothed and interpolated onto low-resolution (> 1 km) grids as our current observed topography data are generally sparsely and unevenly sampled. This issue has potential implications for numerical simulations of ice-sheet dynamics, especially in regions prone to instability where detailed knowledge of the topography, including fine-scale roughness, is required. Here, we present a high-resolution (100 m) synthetic bed elevation terrain for the whole Antarctic continent. The synthetic bed surface preserves topographic roughness characteristics of airborne and ground-based ice-penetrating radar data from the Bedmap1 compilation and the ICECAP consortium. Broad-scale features of the Antarctic landscape are incorporated using a low-pass filter of the Bedmap2 bed-elevation data. Although not intended as a substitute for Bedmap2, the simulated bed elevation terrain has applicability in high-resolution ice-sheet modelling studies, including investigations of the interaction between topography, ice-sheet dynamics, and hydrology, where processes are highly sensitive to bed elevations. The data are available for download at the Australian Antarctic Data Centre (doi:10.4225/15/57464ADE22F50).
Graham, F. S., Roberts, J. L., Galton-Fenzi, B. K., Young, D., Blankenship, D., and Siegert, M. J.: A high-resolution synthetic bed elevation grid of the Antarctic continent, Earth Syst. Sci. Data Discuss., doi:10.5194/essd-2016-18, in review, 2016.