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BedMachine v3 : complete bed topography and ocean bathymetry mapping of Greenland from multibeam echo sounding combined with mass conservation.

Morlighem, M. and Williams, C. N. and Rignot, E. and An, L. and Arndt, J. E. and Bamber, J. L. and Catania, G. and Chauché, N. and Dowdeswell, J. A. and Dorschel, B. and Fenty, I. and Hogan, K. and Howat, I. and Hubbard, A. and Jakobsson, M. and Jordan, T. M. and Kjeldsen, K. K. and Millan, R. and Mayer, L. and Mouginot, J. and Noël, B. P. Y. and O'Cofaigh, C. and Palmer, S. and Rysgaard, S. and Seroussi, H. and Siegert, M. J. and Slabon, P. and Straneo, F. and van den Broeke, M. R. and Weinrebe, W. and Wood, M. and Zinglersen, K. B. (2017) 'BedMachine v3 : complete bed topography and ocean bathymetry mapping of Greenland from multibeam echo sounding combined with mass conservation.', Geophysical research letters., 44 (21). 11,051-11,061.


Greenland's bed topography is a primary control on ice flow, grounding line migration, calving dynamics, and subglacial drainage. Moreover, fjord bathymetry regulates the penetration of warm Atlantic water (AW) that rapidly melts and undercuts Greenland's marine-terminating glaciers. Here we present a new compilation of Greenland bed topography that assimilates seafloor bathymetry and ice thickness data through a mass conservation approach. A new 150 m horizontal resolution bed topography/bathymetric map of Greenland is constructed with seamless transitions at the ice/ocean interface, yielding major improvements over previous data sets, particularly in the marine-terminating sectors of northwest and southeast Greenland. Our map reveals that the total sea level potential of the Greenland ice sheet is 7.42 ± 0.05 m, which is 7 cm greater than previous estimates. Furthermore, it explains recent calving front response of numerous outlet glaciers and reveals new pathways by which AW can access glaciers with marine-based basins, thereby highlighting sectors of Greenland that are most vulnerable to future oceanic forcing.

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Publisher statement:© 2017. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Date accepted:11 September 2017
Date deposited:14 December 2017
Date of first online publication:01 November 2017
Date first made open access:14 December 2017

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