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

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Morlighem, Mathieu
Williams, Chris N.
Rignot, Eric
An, Lu
Arndt, Jan Erik
Bamber, Jonathan L.
Catania, Ginny
Chauché, Nolwenn
Dowdeswell, Julian
Dorschel, Boris
Fenty, Ian
Hogan, Kelly
Howat, Ian M.
Hubbard, Alun
Jakobsson, Martin
Jordan, Tom M.
Kjeldsen, Kristian K.
Millan, Romain
Mayer, Larry A.
Mouginot, Jeremie
Noël, Brice P. Y.
O’Cofaigh, Colm
Palmer, Steven
Rysgaard, Soren
Seroussi, Helene
Siegert, Martin J.
Slabon, Patricia
Straneo, Fiamma
Van den Broeke, Michiel
Weinrebe, W.
Wood, Michael
Zinglersen, Karl Brix
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Mass conservation
Multibeam echo sounding
Radar echo sounding
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.
© The Author(s), 2017. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Geophysical Research Letters 44 (2017): 11,051–11,061, doi:10.1002/2017GL074954.
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Geophysical Research Letters 44 (2017): 11,051–11,061
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