A new bed elevation model for the Weddell Sea sector of the West Antarctic Ice Sheet

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Title: A new bed elevation model for the Weddell Sea sector of the West Antarctic Ice Sheet
Authors: Jeofry, H
Ross, N
Corr, HFJ
Li, J
Morlighem, M
Gogineni, P
Siegert, MJ
Item Type: Journal Article
Abstract: We present a new digital elevation model (DEM) of the bed, with a 1 km gridding, of the Weddell Sea (WS) sector of the West Antarctic Ice Sheet (WAIS). The DEM has a total area of ∼ 125 000 km2 covering the Institute, Möller and Foundation ice streams, as well as the Bungenstock ice rise. In comparison with the Bedmap2 product, our DEM includes 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 improve bed elevation information from the single largest existing dataset in the region, collected by the British Antarctic Survey (BAS) Polarimetric radar Airborne Science Instrument (PASIN) in 2010–2011, from the relatively crude measurements determined in the field for quality control purposes used in Bedmap2. 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 subglacial trough (∼ 2 km below sea level) between the ice-sheet interior and the grounding line of the Foundation Ice Stream have been redefined. From the revised DEM, we are able to better derive the expected routing of basal water and, by comparison with that calculated using Bedmap2, we are able to assess regions where hydraulic flow is sensitive to change. Given the potential vulnerability of this sector to ocean-induced melting at the grounding line, especially in light of the 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, from this, the potential impact on global sea level. The new 1 km bed elevation product of the WS sector can be found at
Issue Date: 9-Apr-2018
Date of Acceptance: 5-Feb-2018
ISSN: 1866-3508
Publisher: Copernicus Publications
Start Page: 711
End Page: 725
Journal / Book Title: Earth System Science Data
Volume: 10
Issue: 2
Copyright Statement: © Author(s) 2018. This work is distributed under the Creative Commons Attribution 4.0 License (
Sponsor/Funder: Natural Environment Research Council (NERC)
British Council (UK)
Funder's Grant Number: GEOG.RE2356
Keywords: Science & Technology
Physical Sciences
Geosciences, Multidisciplinary
Meteorology & Atmospheric Sciences
Publication Status: Published
Appears in Collections:Centre for Environmental Policy
Faculty of Natural Sciences

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