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IceBridge BedMachine Greenland, Version 3
GB/NERC/BAS/PDC/01011

Summary

Abstract:
This data set contains a bed topography/bathymetric map of Greenland based on mass conservation, multi-beam data, and other techniques. The data set also includes surface elevation, ice thickness and an ice/ocean/land mask. Version 3 includes ocean bathymetry all around Greenland based on data from NASA's Ocean Melting Greenland (OMG) and other campaigns of bathymetry measurements. The subglacial bed topography has also been updated by including more ice thickness data and constraining the ice thickness at the ice/ocean interface based on bathymetry data when available.

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. This data set presents a new compilation of Greenland bed topography that assimilates seafloor bathymetry and ice thickness data through a mass conservation (MC) 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 datasets, particularly in the marine-terminating sectors of northwest and southeast Greenland. The map reveals 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.

Funding was provided by the UK NERC grant NE/M000869/1.

Keywords:
BPOG, Bathymetry, Bed topography, Greenland

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