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Bedmap2: Improved ice bed, surface and thickness datasets for Antarctica

Citation

Fretwell, P and Pritchard, HD and Vaughan, DG and Bamber, JL and Barrand, NE and Bell, R and Bianchi, C and Bingham, RG and Blankenship, DD and Casassa, G and Catania, G and Callens, D and Conway, H and Cook, AJ and Corr, HFJ and Damaske, D and Damm, V and Ferraccioli, F and Forsberg, R and Fujita, S and Gim, Y and Gogineni, P and Griggs, JA and Hindmarsh, RCA and Holmlund, P and Holt, JW and Jacobel, RW and Jenkins, A and Jokat, W and Jordan, T and King, EC and Kohler, J and Krabill, W and Riger-Kusk, M and Langley, KA and Leitchenkov, G and Leuschen, C and Luyendyk, BP and Matsuoka, K and Mouginot, J and Nitsche, FO and Nogi, Y and Nost, OA and Popov, SV and Rignot, E and Rippin, DM and Rivera, A and Roberts, Jason and Ross, N and Siegert, MJ and Smith, AM and Steinhage, D and Studinger, M and Sun, B and Tinto, BK and Welch, BC and Wilson, D and Young, DA and Xiangbin, C and Zirizzotti, A, Bedmap2: Improved ice bed, surface and thickness datasets for Antarctica, The Cryosphere, 7, (1) pp. 375-393. ISSN 1994-0416 (2013) [Refereed Article]


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Copyright the Authors 2013-This work is distributed under the Creative Commons Attribution 3.0 License.

DOI: doi:10.5194/tc-7-375-2013

Abstract

We present Bedmap2, a new suite of gridded products describing surface elevation, ice-thickness and the seafloor and subglacial bed elevation of the Antarctic south of 60 S. We derived these products using data from a variety of sources, including many substantial surveys completed since the original Bedmap compilation (Bedmap1) in 2001. In particular, the Bedmap2 ice thickness grid is made from 25 million measurements, over two orders of magnitude more than were used in Bedmap1. In most parts of Antarctica the subglacial landscape is visible in much greater detail than was previously available and the improved data-coverage has in many areas revealed the full scale of mountain ranges, valleys, basins and troughs, only fragments of which were previously indicated in local surveys. The derived statistics for Bedmap2 show that the volume of ice contained in the Antarctic ice sheet (27 million km3) and its potential contribution to sea-level rise (58 m) are similar to those of Bedmap1, but the mean thickness of the ice sheet is 4.6% greater, the mean depth of the bed beneath the grounded ice sheet is 72 m lower and the area of ice sheet grounded on bed below sea level is increased by 10%. The Bedmap2 compilation highlights several areas beneath the ice sheet where the bed elevation is substantially lower than the deepest bed indicated by Bedmap1. These products, along with grids of data coverage and uncertainty, provide new opportunities for detailed modelling of the past and future evolution of the Antarctic ice sheets.

Item Details

Item Type:Refereed Article
Keywords:Antarctica, ice sheet thickness, bedrock elevation
Research Division:Earth Sciences
Research Group:Physical Geography and Environmental Geoscience
Research Field:Glaciology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:Roberts, Jason (Dr Jason Roberts)
ID Code:86346
Year Published:2013
Web of Science® Times Cited:473
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2013-09-06
Last Modified:2014-07-22
Downloads:252 View Download Statistics

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