BedMachine v3: Complete bed topography and ocean bathymetry mapping of Greenland from multi-beam radar sounding combined with mass conservation

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Title: BedMachine v3: Complete bed topography and ocean bathymetry mapping of Greenland from multi-beam radar sounding combined with mass conservation
Author(s): Morlighem, M
Williams, C
Rignot, E
An, L
Bamber, J
Chauche, N
Dowdeswell, J
Dorschel, B
Holland, DM
Holland, D
Howat, I
Hubbard, A
Jordan, T
Millan, R
Mouginot, J
Noel, B
O’Cofaigh, C
Seroussi, H
Siegert, M
Slabon, P
Van den Broeke, M
Weinrebe, W
Item Type: Journal Article
Abstract: 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.
Publication Date: 18-Sep-2017
Date of Acceptance: 16-Sep-2017
URI: http://hdl.handle.net/10044/1/51033
DOI: https://dx.doi.org/10.1002/2017GL074954
ISSN: 0094-8276
Publisher: American Geophysical Union
Start Page: 11,051
End Page: 11,061
Journal / Book Title: Geophysical Research Letters
Volume: 44
Issue: 21
Sponsor/Funder: Natural Environment Research Council (NERC)
Natural Environment Research Council (NERC)
Funder's Grant Number: NE/K004956/2
GEOG.RE2356
Copyright 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.
Keywords: MD Multidisciplinary
Meteorology & Atmospheric Sciences
Publication Status: Published online
Appears in Collections:Centre for Environmental Policy
Faculty of Natural Sciences



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