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, K.; 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.

doi:10.1002/2017gl074954

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, K.; 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.

Authors

M. Morlighem

C.N. Williams

E. Rignot

L. An

J.E. Arndt

J.L. Bamber

G. Catania

N. Chauché

J.A. Dowdeswell

B. Dorschel

I. Fenty

K. Hogan

I. Howat

A. Hubbard

M. Jakobsson

T.M. Jordan

K.K. Kjeldsen

R. Millan

L. Mayer

J. Mouginot

B.P.Y. Noël

Professor Colm O'Cofaigh colm.ocofaigh@durham.ac.uk
Professor

S. Palmer

S. Rysgaard

H. Seroussi

M.J. Siegert

P. Slabon

F. Straneo

M.R. van den Broeke

W. Weinrebe

M. Wood

K.B. Zinglersen

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.

Citation

Morlighem, M., Williams, C., Rignot, E., An, L., Arndt, J., Bamber, J., …Zinglersen, K. (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

Journal Article Type	Article
Acceptance Date	Sep 11, 2017
Online Publication Date	Nov 1, 2017
Publication Date	Nov 16, 2017
Deposit Date	Dec 14, 2017
Publicly Available Date	Dec 14, 2017
Journal	Geophysical Research Letters
Print ISSN	0094-8276
Electronic ISSN	1944-8007
Publisher	Wiley
Peer Reviewed	Peer Reviewed
Volume	44
Issue	21
Pages	11,051-11,061
DOI	https://doi.org/10.1002/2017gl074954

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© 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.