Articles | Volume 15, issue 3
https://doi.org/10.5194/tc-15-1435-2021
https://doi.org/10.5194/tc-15-1435-2021
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

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Cited articles

Alley, R. B. and Joughin, I.: Modeling Ice-Sheet Flow, Science, 336, 551–552, 2012. 
Bons, P. D., Kleiner, T., Llorens, M., Prior, D. J., Sachau, T., Weikusat, I., and Jansen, D.: Greenland Ice Sheet: Higher nonlinearity of ice flow significantly reduces estimated basal motion, Geophys. Res. Lett., 45, 6542–6548, 2018. 
Booth, A. D., Clark, R. A., Kulessa, B., Murray, T., Carter, J., Doyle, S., and Hubbard, A.: Thin-layer effects in glaciological seismic amplitude-versus-angle (AVA) analysis: implications for characterising a subglacial till unit, Russell Glacier, West Greenland, The Cryosphere, 6, 909–922, https://doi.org/10.5194/tc-6-909-2012, 2012. 
Bougamont, M., Christoffersen, P., Hubbard, A., Fitzpatrick, A., Doyle, S., and Carter, S.: Sensitive response of the Greenland Ice Sheet to surface melt drainage over a soft bed, Nat. Commun., 5, 19, https://doi.org/10.1038/ncomms6052, 2014. 
Carr, J. R., Vieli, A., Stokes, C., Jamieson, S., Palmer, S., Christoffersen, P., Dowdeswell, J., Nick, F., Blankenship, D. D., and Young, D. A.: Basal topographic controls on rapid retreat of Humboldt Glacier, northern Greenland, J. Glaciol., 61, 137–150, 2015. 
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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.