Articles | Volume 15, issue 3
Research article
22 Mar 2021
Research article |  | 22 Mar 2021

Basal traction mainly dictated by hard-bed physics over grounded regions of Greenland

Nathan Maier, Florent Gimbert, Fabien Gillet-Chaulet, and Adrien Gilbert

Data sets

Basal shear stress of the Ross ice streams from control method inversions I. Joughin, D. R. MacAyeal, and S. Tulaczyk

MEaSUREs Greenland Ice Mapping Project (GIMP) Digital Elevation Model from GeoEye and WorldView Imagery I. Howat, A. Negrete, and B. Smith

IceBridge BedMachine Greenland, Version 3 M. Morlighem

Likely Basal Thermal State of the Greenland Ice Sheet, Version 1 J. MacGregor, M. Fahnestock, G. Catania, J. Paden, P. Gogineni, M. Morlighem, W. Colgan, S. M. Nowicki, G. Clow, A. Aschwanden, S.F. Price, and H. Seroussi

Firn Area Delineation (multi-year averaged snowline) B. Vandecrux, M. MacFerrin, H. Machguth, W. T. Colgan, D. van As, A. Heilig, C. M. Stevens, C. M., C. Charalampidis, R. S. Fausto, E. M. Morris, E. Mosley-Thompson, L. Koenig, L. N. Montgomery, C. Miege, S. B. Simonsen, T. Ingeman-Nielsen, and J. E. Box

Short summary
In Greenland, ice motion and the surface geometry depend on the friction at the bed. We use satellite measurements and modeling to determine how ice speeds and friction are related across the ice sheet. The relationships indicate that ice flowing over bed bumps sets the friction across most of the ice sheet's on-land regions. This result helps simplify and improve our understanding of how ice motion will change in the future.