Journal
NATURE COMMUNICATIONS
Volume 7, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms13903
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Funding
- Laboratory Directed Research and Development Early Career Research Program (LDRD-ECR) at Los Alamos National Laboratory, Climate Modeling Programs within the U.S. Department of Energy Office of Science
- National Science Foundation [ANT-0424589]
- National Science Foundation Division of Earth Sciences (EAR) Postdoctoral Fellowship [0946767]
- United States National Science Foundation [OPP-0908156, OPP-0909454]
- Swiss National Science Foundation [200021_127197]
- National Geographic Society [9067-12]
- NASA Cryospheric Sciences
- Swiss National Science Foundation (SNF) [200021_127197] Funding Source: Swiss National Science Foundation (SNF)
- Directorate For Geosciences
- Division Of Earth Sciences [0946767] Funding Source: National Science Foundation
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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. These results suggest that a third weakly connected drainage component should be included in the conceptual model of subglacial hydrology.
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