Articles | Volume 15, issue 2
https://doi.org/10.5194/tc-15-897-2021
https://doi.org/10.5194/tc-15-897-2021
Research article
 | 
19 Feb 2021
Research article |  | 19 Feb 2021

The cooling signature of basal crevasses in a hard-bedded region of the Greenland Ice Sheet

Ian E. McDowell, Neil F. Humphrey, Joel T. Harper, and Toby W. Meierbachtol

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Cited articles

Andrews, L. C., Catania, G. A., Hoffman, M. J., Gulley, J. D., Lüthi, M. P., Ryser, C., Hawley, R. L., and Neumann, T. A.: Direct observations of evolving subglacial drainage beneath the Greenland Ice Sheet, Nature, 514, 80–83, https://doi.org/10.1038/nature13796, 2014. 
Brown, J., Harper, J., and Humphrey, N.: Liquid water content in ice estimated through a full-depth ground radar profile and borehole measurements in western Greenland, The Cryosphere, 11, 669–679, https://doi.org/10.5194/tc-11-669-2017, 2017. 
Carslaw, H. S. and Jaeger, J. C.: Conduction of Heat in Solids, 2nd edition, Clarendon Press, Oxford, England, 1959. 
Catania, G. A. and Neumann, T. A.: Persistent englacial drainage features in the Greenland Ice Sheet, Geophys. Res. Lett., 37, L02501, https://doi.org/10.1029/2009GL041108, 2010. 
Catania, G. A., Conway, H., Raymond, C. F., and Scambos, T. A.: Surface morphology and internal layer stratigraphy in the downstream end of Kamb Ice Stream, West Antarctica, J. Glaciol., 51, 423–431, https://doi.org/10.3189/172756505781829142, 2005. 
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Short summary
Ice temperature controls rates of internal deformation and the onset of basal sliding. To identify heat transfer mechanisms and englacial heat sources within Greenland's ablation zone, we examine a 2–3-year continuous temperature record from nine full-depth boreholes. Thermal decay after basal crevasses release heat in the near-basal ice likely produces the observed cooling. Basal crevasses in Greenland can affect the basal ice rheology and indicate a potentially complex basal hydrologic system.