A high-resolution synthetic bed elevation grid of the Antarctic continent

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Title: A high-resolution synthetic bed elevation grid of the Antarctic continent
Author(s): Graham, F
Roberts, J
Galton-Fenzi, B
Young, D
Blankenship, D
Siegert, MJ
Item Type: Journal Article
Abstract: Digital elevation models of Antarctic bed topography are smoothed and interpolated onto low-resolution ( > 1 km) grids as 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 Antarctica, encompassing the continent, continental shelf, and seas south of 60° S. Although not identically matching observations, the synthetic bed surface – denoted as HRES – preserves topographic roughness characteristics of airborne and ground-based ice-penetrating radar data measured by the ICECAP (Investigating the Cryospheric Evolution of the Central Antarctic Plate) consortium or used to create the Bedmap1 compilation. Broad-scale ( > 5 km resolution) features of the Antarctic landscape are incorporated using a low-pass filter of the Bedmap2 bed elevation data. HRES 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 and fine-scale roughness. The data are available for download from the Australian Antarctic Data Centre (doi:10.4225/15/57464ADE22F50).
Publication Date: 5-May-2017
Date of Acceptance: 7-Apr-2017
URI: http://hdl.handle.net/10044/1/47944
DOI: https://dx.doi.org/10.5194/essd-9-267-2017
ISSN: 1866-3516
Publisher: Copernicus Publications
Start Page: 267
End Page: 279
Journal / Book Title: Earth System Science Data
Volume: 9
Copyright Statement: © Author(s) 2017. This work is distributed under the Creative Commons Attribution 3.0 License. (https://creativecommons.org/licenses/by/3.0/)
Sponsor/Funder: British Council (UK)
Funder's Grant Number: ICECAP-2
Keywords: Science & Technology
Physical Sciences
Geosciences, Multidisciplinary
Meteorology & Atmospheric Sciences
Geology
ICE-SHEET INSTABILITY
PINE ISLAND GLACIER
CONDITIONAL SIMULATIONS
BEDROCK TOPOGRAPHY
COVARIANCE-MATRIX
WEST ANTARCTICA
EAST ANTARCTICA
MORPHOLOGY
THICKNESS
DYNAMICS
Publication Status: Published
Appears in Collections:Centre for Environmental Policy
Faculty of Natural Sciences



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