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Bedmap2: Improved Ice Bed, Surface and Thickness Datasets for Antarctica : Volume 6, Issue 5 (11/10/2012)

By Fretwell, P.

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Book Id: WPLBN0004022752
Format Type: PDF Article :
File Size: Pages 57
Reproduction Date: 2015

Title: Bedmap2: Improved Ice Bed, Surface and Thickness Datasets for Antarctica : Volume 6, Issue 5 (11/10/2012)  
Author: Fretwell, P.
Volume: Vol. 6, Issue 5
Language: English
Subject: Science, Cryosphere, Discussions
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Vaughan, D. G., Cook, A. J., Fujita, S., Bamber, J. L., Forsberg, R., Roberts, J.,...Ferraccioli, F. (2012). Bedmap2: Improved Ice Bed, Surface and Thickness Datasets for Antarctica : Volume 6, Issue 5 (11/10/2012). Retrieved from http://www.ebooklibrary.org/


Description
Description: British Antarctic Survey, Cambridge, UK. 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 coverage of data 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.

Summary
Bedmap2: improved ice bed, surface and thickness datasets for Antarctica

Excerpt
Bamber, J. L., Baldwin, D. J., and Gogineni, S. P.: A new bedrock and surface elevation dataset for modelling the Greenland ice sheet, Ann. Glaciol., 37, 351–356, 2003.; Bamber, J. L., Gomez-Dans, J. L., and Griggs, J. A.: A new 1 km digital elevation model of the Antarctic derived from combined satellite radar and laser data – Part 1: Data and methods, The Cryosphere, 3, 101–111, doi:10.5194/tc-3-101-2009, 2009a.; Bamber, J. L., Riva, R. E. M., Vermeersen, B. L. A., and LeBrocq, A. M.: Reassessment of the Potential Sea-Level Rise from a Collapse of the West Antarctic Ice Sheet, Science, 324, 901–903, doi:10.1126/science.1169335, 2009b.; Bell, R. E., Ferraccioli, F., Creyts, T. T., Braaten, D., Corr, H., Das, I., Damaske, D., Frearson, N., Jordan, T., Rose, K., Studinger, M., and Wolovick, M.: Widespread persistent thickening of the East Antarctic Ice Sheet by freezing from the base, Science, 331, 1592–1595, 10.1126/science.1200109, 2011.; Bentley, C. R.: The structure of Antarctica and its ice cover, in: Research in Geophysics, vol. 2, Solid Earth and Interface Phenomena, edited by: Odishaw, H., MIT Press, Cambridge, Mass., 335–389, 1964.; Bindschadler, R., Vornberger, P., Fleming, A., Fox, A., Mullins, J. L., Binnie, D., Paulsen, S. J., Granneman, B., and Gorodetzky, D.: The Landsat image mosaic of Antarctica, Remote Sens. Environ., 112, 13, doi:10.1016/j.rse.2008.07.006 2008.; Bingham, R. G., Ferraccioli, F., King, E. C., Larter, R. D., Pritchard, H. D., Smith, A. M., and Vaughan, D. G.: Inland thinning of West Antarctic Ice Sheet steered along subglacial rifts, Nature, 487, 468–471, doi:10.1038/nature11292, 2012.; Bohlander, J. and Scambos, T.: Antarctic coastlines and grounding line derived from MODIS Mosaic of Antarctica (MOA), National Snow and Ice Data Center, Boulder, CO, USA, 2007.; Griggs, J. A. and Bamber, J. L.: Antarctic ice-shelf thickness from satellite radar altimetry, J. Glaciol., 57, 485–498, 2011.; Brenner, A. C., DiMarzio, J. R., and Zwally, H. J.: Precision and accuracy of satellite radar and laser altimeter data over the continental ice sheets, IEEE T. Geosci. Remote, 45, 321–331, doi:10.1109/TGRS.2006.887172, 2007.; Cook, A. J., Murray, T., Luckman, A., Vaughan, D. G., and Barrand, N. E.: A new 100-m Digital Elevation Model of the Antarctic Peninsula derived from ASTER Global DEM: methods and accuracy assessment, Earth Syst. Sci. Data Discuss., 5, 365–403, doi:10.5194/essdd-5-365-2012, 2012.; DiMarzio, J., Brenner, A., Schutz, R., Shuman, C. A., and Zwally, H. J.: GLAS/ICESat 500 m laser altimetry digital elevation model of Antarctica: Digital media, National Snow and Ice Data Center, Boulder, CO, USA, 2007.; Drewry, D. J. and Jordan, S. R.: The Bedrock Surface of Antarctica, Scott Polar Research Institute, Cambridge, 1983.; Drewry,&a

 

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