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Earth System Science Data The Data Publishing Journal
https://doi.org/10.5194/essd-2017-90
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Review article
26 Oct 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Earth System Science Data (ESSD).
A new bed elevation model for the Weddell Sea sector of the West Antarctic Ice Sheet
Hafeez Jeofry1,2, Neil Ross3, Hugh F. J. Corr4, Jilu Li5, Prasad Gogineni6, and Martin J. Siegert1 1Grantham Institute and Department of Earth Science and Engineering, Imperial College London, South Kensington, London, UK
2School of Marine Science and Environment, Universiti Malaysia Terengganu, Kuala Terengganu, Terengganu, Malaysia
3School of Geography, Politics and Sociology, Newcastle University, Claremont Road, Newcastle Upon Tyne, UK
4British Antarctic Survey, Natural Environment Research Council, Cambridge, UK
5Center for the Remote Sensing of Ice Sheets, University of Kansas, Lawrence, Kansas, USA
6ECE Department, The University of Alabama, Tuscaloosa, AL 35487, USA
Abstract. We present a new bed elevation digital elevation model (DEM), with a 1 km spatial resolution, for the Weddell Sea sector of the West Antarctic Ice Sheet. The DEM has a total area of ~125,000 km2 covering the Institute, Möller and Foundation ice streams and the Bungenstock ice rise. In comparison with the Bedmap2 product, our DEM includes several new aerogeophysical datasets acquired by the Center for Remote Sensing of Ice Sheets (CReSIS) through the NASA Operation IceBridge (OIB) program in 2012, 2014 and 2016. We also update bed elevation information from the single largest existing dataset in the region, collected by the British Antarctic Survey (BAS) Polarimetric Airborne Survey Instrument (PASIN) in 2010-11, as BEDMAP2 included only relatively crude ice thickness measurements determined in the field for quality control purposes. This have resulted in the deep parts of the topography not being visible in the fieldwork non-SAR processed radargrams. While the gross form of the new DEM is similar to Bedmap2, there are some notable differences. For example, the position and size of a deep trough (~ 2 km below sea level) between the ice sheet interior and the grounding line of Foundation ice stream has been redefined. From the revised DEM, we are able to better derive the expected routing of basal water at the ice-bed interface, and by comparison with that calculated using Bedmap2 we are able to assess regions where hydraulic flow is sensitive to change. Given the sensitivity of this sector of the ice sheet to ocean-induced melting at the grounding line, especially in light of improved definition of the Foundation ice stream trough, our revised DEM will be of value to ice-sheet modelling in efforts to quantify future glaciological changes in the region, and therefore the potential impact on global sea level. The new 1 km bed elevation product of the Weddell Sea sector, West Antarctica can be found in the http://doi.org/10.5281/zenodo.1035488.

Citation: Jeofry, H., Ross, N., Corr, H. F. J., Li, J., Gogineni, P., and Siegert, M. J.: A new bed elevation model for the Weddell Sea sector of the West Antarctic Ice Sheet, Earth Syst. Sci. Data Discuss., https://doi.org/10.5194/essd-2017-90, in review, 2017.
Hafeez Jeofry et al.
Hafeez Jeofry et al.

Data sets

1-km bed topography digital elevation model (DEM) of the Weddell Sea sector, West Antarctica
H. Jeofry, N. Ross, H. Corr, F. J. Hugh, J. Li, P. Gogineni, and M. J. Siegert
https://doi.org/10.5281/zenodo.1035488
Hafeez Jeofry et al.

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Short summary
Accurately characterising the complexities of the ice sheet dynamic specifically close to the grounding line across the Weddell Sea (WS) sector in the ice sheet models provide challenges to the scientific community. Our main objective is to to comprehend these complexities, adding accuracy into the projection of future ice sheet dynamic. Therefore, we have developed a new bed elevation digital elevation model across the WS sector, and will be of value to ice-sheet modelling experiments.
Accurately characterising the complexities of the ice sheet dynamic specifically close to the...
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