Glacier surge dynamics of Sortebræ, east Greenland, from synthetic aperture radar feature tracking
Article first published online: 5 AUG 2005
Copyright 2005 by the American Geophysical Union.
Journal of Geophysical Research: Earth Surface (2003–2012)
Volume 110, Issue F3, September 2005
How to Cite
2005), Glacier surge dynamics of Sortebræ, east Greenland, from synthetic aperture radar feature tracking, J. Geophys. Res., 110, F03005, doi:10.1029/2004JF000233., , , , and (
- Issue published online: 5 AUG 2005
- Article first published online: 5 AUG 2005
- Manuscript Accepted: 11 MAY 2005
- Manuscript Revised: 26 APR 2005
- Manuscript Received: 31 AUG 2004
 We have measured the surface flow rate of the large east Greenland glacier, Sortebræ, through both the initiation and termination of a major surge using synthetic aperture radar (SAR) feature tracking, optimized to minimize error. The Sortebræ surge began between November and January 1992–1993, after at least 6 weeks of subfreezing temperatures over the whole glacier, and propagated rapidly up-glacier from a central nucleus. Sortebræ reached sustained fast flow rates of up to 24 m d−1, and the active phase lasted for 28–32 months before terminating in June 1995. Termination was abrupt, coinciding with the arrival of the spring thaw and the apparent release of a large volume of stored water from a single outlet at the front. The surge mechanism is interpreted as a switch from channelized to distributed drainage, which at present is best explained by Kamb's linked cavity sliding model.