An increase in crevasse extent, West Greenland: Hydrologic implications
Article first published online: 16 SEP 2011
Copyright 2011 by the American Geophysical Union.
Geophysical Research Letters
Volume 38, Issue 18, September 2011
How to Cite
2011), An increase in crevasse extent, West Greenland: Hydrologic implications, Geophys. Res. Lett., 38, L18502, doi:10.1029/2011GL048491., , , , , , , and (
- Issue published online: 16 SEP 2011
- Article first published online: 16 SEP 2011
- Manuscript Accepted: 19 AUG 2011
- Manuscript Revised: 11 AUG 2011
- Manuscript Received: 10 JUN 2011
- mass balance;
 We compare high-resolution 1985 and 2009 imagery to assess changes in crevasse extent in the Sermeq Avannarleq ablation zone, West Greenland. The area occupied by crevasses >2 m wide significantly increased (13 ± 4%) over the 24-year period. This increase consists of an expansion of existing crevasse fields, and is accompanied by widespread changes in crevasse orientation (up to 45°). We suggest that a combination of ice sheet thinning and steepening are responsible for the increase in crevasse extent. We examine the potential impact of this change on the hydrology of the ice sheet. We provide a first-order demonstration that moulin-type drainage is more efficient in transferring meltwater fluctuations to the subglacial system than crevasse-type drainage. As enhanced basal sliding is associated with meltwater “pulses”, an increase in crevasse extent can therefore be expected to result in a net decrease in basal sliding sensitivity. An increase in crevasse extent may also accelerate cryo-hydrologic warming and enhance surface ablation.