Journal cover Journal topic
Earth System Science Data The Data Publishing Journal
doi:10.5194/essd-2016-18
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Brief communication
04 Jul 2016
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A revision of this discussion paper was accepted for the journal Earth System Science Data (ESSD) and is expected to appear here in due course.
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. Siegert5 1Institute 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
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).

Citation: 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.
Felicity S. Graham et al.
Interactive discussionStatus: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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RC1: 'review of m/s', Anonymous Referee #1, 23 Aug 2016 Printer-friendly Version Supplement 
 
RC2: 'Review Comments', Anonymous Referee #2, 15 Nov 2016 Printer-friendly Version Supplement 
 
AC1: 'Joint author response to reviewers comments, with manuscript changes', Felicity Graham, 16 Mar 2017 Printer-friendly Version Supplement 
Felicity S. Graham et al.

Data sets

HRES – Synthetic high-resolution Antarctic bed elevation
Felicity S. Graham, Jason L. Roberts, Ben K. Galton-Fenzi, Duncan Young, Donald D. Blankenship, and Martin J. Siegert
doi:10.4225/15/57464ADE22F50
Felicity S. Graham et al.

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Short summary
Antarctic bed topography datasets are interpolated onto low-resolution grids because our observed topography data are sparsely sampled. This has implications for ice-sheet model simulations, especially in regions prone to instability, such as grounding lines, where detailed knowledge of the topography is required. Here, we constructed a high-resolution synthetic bed elevation dataset using observed covariance properties to assess the dependence of simulated ice sheet dynamics on grid resolution.
Antarctic bed topography datasets are interpolated onto low-resolution grids because our...
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