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

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.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL)

Sponsoring Organization:: LDRD; USDOE

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1343703

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

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

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Physical conditions of fast glacier flow: 1. measurements from boreholes drilled to the bed of Store Glacier, West Greenland Doyle, Sh; Hubbard, B.; Christoffersen, Poul Apollo - University of Cambridge Repository https://doi.org/10.17863/cam.17485	text	January 2018
Cascading lake drainage on the Greenland Ice Sheet triggered by tensile shock and fracture. Christoffersen, Poul; Bougamont, Marion; Hubbard, Alun Apollo - University of Cambridge Repository https://doi.org/10.17863/cam.22013	text	January 2018
Dual-satellite (Sentinel-2 and Landsat 8) remote sensing of supraglacial lakes in Greenland Williamson, Andrew; Banwell, Af; Willis, Ian Apollo - University of Cambridge Repository https://doi.org/10.17863/cam.32538	text	January 2018
Modelling seasonal meltwater forcing of the velocity of land-terminating margins of the Greenland Ice Sheet Koziol, Conrad P.; Arnold, Neil Apollo - University of Cambridge Repository https://doi.org/10.17863/cam.32770	text	January 2018
The Influence of Hydrology on the Dynamics of Land-Terminating Sectors of the Greenland Ice Sheet Davison, Benjamin Joseph; Sole, Andrew John; Livingstone, Stephen John Frontiers in Earth Science, Vol. 7 https://doi.org/10.3389/feart.2019.00010	journal	February 2019
Seasonal evolution of the subglacial hydrologic system modified by supraglacial lake drainage in western Greenland C., Andrews, Lauren; J., Hoffman, Matthew; A., Neumann, Thomas Wiley-Blackwell Publishing, Inc. https://doi.org/10.5167/uzh-162832	text	January 2018
SHAKTI: Subglacial Hydrology and Kinetic, Transient Interactions v1.0 Sommers, Aleah; Rajaram, Harihar; Morlighem, Mathieu Geoscientific Model Development, Vol. 11, Issue 7 https://doi.org/10.5194/gmd-11-2955-2018	journal	January 2018
Dual-satellite (Sentinel-2 and Landsat 8) remote sensing of supraglacial lakes in Greenland Williamson, Andrew G.; Banwell, Alison F.; Willis, Ian C. The Cryosphere, Vol. 12, Issue 9 https://doi.org/10.5194/tc-12-3045-2018	journal	January 2018
Basal control of supraglacial meltwater catchments on the Greenland Ice Sheet Crozier, Josh; Karlstrom, Leif; Yang, Kang The Cryosphere, Vol. 12, Issue 10 https://doi.org/10.5194/tc-12-3383-2018	journal	January 2018
Modelling seasonal meltwater forcing of the velocity of land-terminating margins of the Greenland Ice Sheet Koziol, Conrad P.; Arnold, Neil The Cryosphere, Vol. 12, Issue 3 https://doi.org/10.5194/tc-12-971-2018	journal	January 2018
Relationship Between Greenland Ice Sheet Surface Speed And Modeled Effective Pressure Stevens, Laura A.; Hewitt, Ian; Das, Sarah B. Zenodo https://doi.org/10.5281/zenodo.1299944	text	January 2018
Relationship Between Greenland Ice Sheet Surface Speed And Modeled Effective Pressure Stevens, Laura A.; Hewitt, Ian; Das, Sarah B. Zenodo https://doi.org/10.5281/zenodo.1299945	text	January 2018

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