BEDMAP: A new ice thickness and subglacial topographic model of Antarctica

• Published in: Journal of Geophysical Research: Solid Earth
• Main Authors: Lythe, Matthew, Vaughan, David G., Lambrecht, A., Miller, H., Nixdorf, U., Oerter, H., Steinhage, D., Allison, I.F., Craven, M., Goodwin, I.D., Jacka, J., Morgan, V., Ruddell, A., Young, N., Wellman, P., Cooper, A.P.R., Corr, H.F.J., Doake, C.S.M., Hindmarsh, R.C.A., Jenkins, A., Johnson, M.R., Jones, P., King, E.C., Smith, A.M., Thomson, J.W., Thorley, M.R., Jezek, K., Li, B., Liu, H., Damm, V., Nishio, F., Fujita, S., Skvarca, P., Remy, F., Testut, L., Sievers, J., Kapitsa, A., Macheret, Y., Scambos, T., Filina, I., Masolov, V., Popov, S., Johnstone, G., Jacobel, B., Holmlund, P., Naslund, J., Anandakrishnan, S., Bamber, J.L., Bassford, R., Decleir, H.
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: American Geophysical Union 2001
• Subjects: Antarctic; The Antarctic; West Antarctic Ice Sheet; East Antarctic Ice Sheet; Antarc*; Antarctica; Antarctica Journal; Ice Sheet; Ice Shelf; Ice Shelves
• Online Access: http://nora.nerc.ac.uk/id/eprint/19869/; https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2000JB900449

Measurements of ice thickness on the Antarctic ice sheet collected during surveys undertaken over the past 50 years have been brought together into a single database. From these data, a seamless suite of digital topographic models have been compiled for Antarctica and its surrounding ocean. This includes grids of ice sheet thickness over the grounded ice sheet and ice shelves, water column thickness beneath the floating ice shelves, bed elevation beneath the grounded ice sheet, and bathymetry to 60°S, including the sub-ice-shelf cavities. These grids are consistent with a recent high-resolution surface elevation model of Antarctica. While the digital models have a nominal spatial resolution of 5 km, such high resolution is justified by the original data density only over a few parts of the ice sheet. The suite does, however, provide an unparalleled vision of the geosphere beneath the ice sheet and a more reliable basis for ice sheet modeling than earlier maps. The total volume of the Antarctic ice sheet calculated from the BEDMAP grid is 25.4 million km3, and the total sea level equivalent, derived from the amount of ice contained within the grounded ice sheet, is 57 m, comprising 52 m from the East Antarctic ice sheet and 5 m from the West Antarctic ice sheet, slightly less than earlier estimates. The gridded data sets can be obtained from the authors.