Bed topography; Dynamic component; Greenland; Greenland Ice Sheet; Ice sheet; Mass loss; Sea level rise; Geophysics; Earth and Planetary Sciences (all); General Earth and Planetary Sciences
Abstract :
[en] Greenland's outlet glaciers have been a leading source of mass loss and accompanying sea-level rise from the Greenland Ice Sheet (GrIS) over the last 25 years. The dynamic component of outlet glacier mass loss depends on both the ice flux through the terminus and the inland extent of glacier thinning, initiated at the ice-ocean interface. Here, we find limits to the inland spread of thinning that initiates at glacier termini for 141 ocean-terminating outlet glaciers around the GrIS. Inland diffusion of thinning is limited by steep reaches of bed topography that we call "knickpoints." We show that knickpoints exist beneath the majority of outlet glaciers but they are less steep in regions of gentle bed topography, giving glaciers in gentle bed topography the potential to contribute to ongoing and future mass loss from the GrIS by allowing the diffusion of thinning far into the ice sheet interior.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Felikson, Denis ; Cryospheric Sciences Laboratory NASA Goddard Space Flight Center Greenbelt MD USA ; Goddard Earth Sciences Technology and Research Studies and Investigations Universities Space Research Association Columbia MD USA
A Catania, Ginny ; University of Texas Institute for Geophysics University of Texas at Austin Austin TX USA ; Department of Geological Sciences University of Texas at Austin Austin TX USA
Bartholomaus, Timothy C ; Department of Geological Sciences University of Idaho Moscow ID USA
Morlighem, Mathieu ; Department of Earth System Science University of California, Irvine Irvine CA USA
Noël, Brice ; Université de Liège - ULiège > Département de géographie > Climatologie et Topoclimatologie ; Institute for Marine and Atmospheric Research Utrecht Utrecht University Utrecht The Netherlands
Language :
English
Title :
Steep Glacier Bed Knickpoints Mitigate Inland Thinning in Greenland.
NASA - National Aeronautics and Space Administration NWO - Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Funding text :
We wish to thank two anonymous reviewers of this manuscript for their particular attention to detail and constructive comments. This research was funded by NASA grant NNX12AP50G, the Gale White Fellowship at the University of Texas Institute for Geophysics, and the NASA Postdoctoral Program at the Goddard Space Flight Center, administered by Universities Space Research Association under contract with NASA. B. P. Y. Noël was funded by NWO VENI grant VI.Veni.192.019. ArcticDEM was provided by the Polar Geospatial Center under NSF OPP awards 1043681, 1559691, and 1542736.
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