Greenland subglacial drainage evolution regulated by weakly connected regions of the bed

Hoffman, Matthew J.; Andrews, Lauren C.; Price, Stephen A.; Catania, Ginny A.; Neumann, Thomas A.; Luthi, Martin P.; Gulley, Jason; Ryser, Claudia; Hawley, Robert L.; Morriss, Blaine

doi:10.1038/ncomms13903

Title: Greenland subglacial drainage evolution regulated by weakly connected regions of the bed

Journal Article · Mon Dec 19 00:00:00 EST 2016 · Nature Communications

DOI:https://doi.org/10.1038/ncomms13903· OSTI ID:1343703

^[1]; Andrews, Lauren C. ^[2]; Price, Stephen A. ^[1]; Catania, Ginny A. ^[3]; Neumann, Thomas A. ^[2]; Luthi, Martin P. ^[4]; Gulley, Jason ^[5]; Ryser, Claudia ^[6]; Hawley, Robert L. ^[7]; Morriss, Blaine ^[8]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
Univ. of Texas, Austin, TX (United States)
Univ. of Zurich, Zurich (Switzerland)
Univ. of South Florida, Tampa, FL (United States)
Swiss Federal Institute of Technology (ETH) Zurich, Zurich (Switzerland)
Dartmouth College, Hanover, NH (United States)
Cold Regions Research and Engineering Lab., Hanover, NH (United States)

Penetration of surface meltwater to the bed of the Greenland Ice Sheet each summer causes an initial increase in ice speed due to elevated basal water pressure, followed by slowdown in late summer that continues into fall and winter. While this seasonal pattern is commonly explained by an evolution of the subglacial drainage system from an inefficient distributed to efficient channelized configuration, mounting evidence indicates that subglacial channels are unable to explain important aspects of hydrodynamic coupling in late summer and fall. Here we use numerical models of subglacial drainage and ice flow to show that limited, gradual leakage of water and lowering of water pressure in weakly connected regions of the bed can explain the dominant features in late and post melt season ice dynamics. Finally, these results suggest that a third weakly connected drainage component should be included in the conceptual model of subglacial hydrology.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1343703

Report Number(s):: LA-UR-16-24080

Journal Information:: Nature Communications, Vol. 7; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 78 works

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Ice dynamic response to two modes of surface lake drainage on the Greenland ice sheet Tedesco, Marco; Willis, Ian C.; Hoffman, Matthew J. Columbia University https://doi.org/10.7916/d8h41rcg	text	January 2013
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Sustained high basal motion of the Greenland ice sheet revealed by borehole deformation Ryser, Claudia; Lüthi, Martin P.; Andrews, Lauren C. International Glaciological Society https://doi.org/10.5167/uzh-101718	text	January 2014
Thick sediments beneath Greenland's ablation zone and their potential role in future ice sheet dynamics Walter, Fabian; Chaput, Julien; Lüthi, Martin P. Geological Society of America https://doi.org/10.5167/uzh-101745	text	January 2014
The Effect of the Subglacial Water Pressure on the Sliding Velocity of a Glacier in an Idealized Numerical Model Iken, Almut Journal of Glaciology, Vol. 27, Issue 97 https://doi.org/10.1017/s0022143000011448	journal	January 1981

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Fluctuation analysis in the dynamic characteristics of continental glacier based on Full-Stokes model Wu, Zhen; Zhang, Huiwen; Liu, Shiyin Scientific Reports, Vol. 9, Issue 1 https://doi.org/10.1038/s41598-019-56864-3	journal	December 2019

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Title: Greenland subglacial drainage evolution regulated by weakly connected regions of the bed

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