Surface Meltwater Impounded by Seasonal Englacial Storage in West Greenland

Kendrick, A. K. and Schroeder, D. M. and Chu, W. and Young, T. J. and Christoffersen, P. and Todd, J. and Doyle, S. H. and Box, J. E. and Hubbard, A. and Hubbard, B. and Brennan, P. V. and Nicholls, K. W. and Lok, L. B. (2018) Surface Meltwater Impounded by Seasonal Englacial Storage in West Greenland. Geophysical Research Letters, 45 (19). 10,474-10,481. ISSN 0094-8276

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Abstract

The delivery of surface meltwater through englacial drainage systems to the bed of the Greenland Ice Sheet modulates ice flow through basal lubrication. Recent studies in Southeast Greenland have identified a perennial firn aquifer; however, there are few observations quantifying the input or residence time of water within the englacial system and it remains unknown whether water can be stored within solid ice. Using hourly stationary radar measurements, we present observations of englacial and episodic subglacial water in the ablation zone of Store Glacier in West Greenland. We find significant storage of meltwater in solid ice damaged by crevasses extending down to 48 m below the ice surface during the summer, which is released or refrozen during winter. This is a significant hydrological component newly observed in the ablation zone of Greenland that could delay the delivery of meltwater to the bed, changing the ice dynamic response to surface meltwater.

Item Type:
Journal Article
Journal or Publication Title:
Geophysical Research Letters
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1900
Subjects:
ID Code:
128864
Deposited By:
Deposited On:
08 Nov 2018 10:12
Refereed?:
Yes
Published?:
Published
Last Modified:
18 Sep 2020 04:35