BedMachine v3: Complete Bed Topography and Ocean Bathymetry Mapping of Greenland From Multibeam Echo Sounding Combined With Mass Conservation

Morlighem, M.; Williams, C. N.; Rignot, E.; An, L.; Arndt, J. E.; Bamber, J. L.; Catania, G.; Chauché, N.; Dowdeswell, J. A.; Dorschel, B.; Fenty, I.; Hogan, Kelly ORCID: https://orcid.org/0000-0002-1256-8010; Howat, I.; Hubbard, A.; Jakobsson, M.; Jordan, T. M.; Kjeldsen, K. K.; Millan, R.; Mayer, L.; Mouginot, J.; Noël, B. P. Y.; O'Cofaigh, C.; Palmer, S.; Rysgaard, S.; Seroussi, H.; Siegert, M. J.; Slabon, P.; Straneo, F.; van den Broeke, M. R.; Weinrebe, W.; Wood, M.; 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. https://doi.org/10.1002/2017GL074954

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Official URL: http://dx.doi.org/10.1002/2017GL074954

Abstract/Summary

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.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1002/2017GL074954
ISSN:	00948276
Additional Keywords:	Greenland, bathymetry, mass conservation, multibeam echo sounding, radio echo sounding, glaciology
Date made live:	16 Jan 2018 11:51 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/518979

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.1002/2017GL074954

ISSN:

00948276

Additional Keywords:

Greenland, bathymetry, mass conservation, multibeam echo sounding, radio echo sounding, glaciology

Date made live:

16 Jan 2018 11:51 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/518979