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Tidally induced velocity variations of the Beardmore Glacier, Antarctica, and their representation in satellite measurements of ice velocity
- Source :
- The Cryosphere, Vol 7, Iss 5, Pp 1375-1384 (2013)
- Publication Year :
- 2013
- Publisher :
- Copernicus Publications, 2013.
-
Abstract
- Ocean tides close to the grounding line of outlet glaciers around Antarctica have been shown to directly influence ice velocity, both linearly and non-linearly. These fluctuations can be significant and have the potential to affect satellite measurements of ice discharge, which assume displacement between satellite passes to be consistent and representative of annual means. Satellite observations of horizontal velocity variation in the grounding zone are also contaminated by vertical tidal effects, the importance of which is highlighted here in speckle tracking measurements. Eight TerraSAR-X scenes from the grounding zone of the Beardmore Glacier are analysed in conjunction with GPS measurements to determine short-term and decadal trends in ice velocity. Diurnal tides produce horizontal velocity fluctuations of >50% on the ice shelf, recorded in the GPS data 4 km downstream of the grounding line. This variability decreases rapidly to
- Subjects :
- Environmental sciences
GE1-350
Geology
QE1-996.5
Subjects
Details
- Language :
- English
- ISSN :
- 19940416 and 19940424
- Volume :
- 7
- Issue :
- 5
- Database :
- Directory of Open Access Journals
- Journal :
- The Cryosphere
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.3c755d2fb513400cbe04cf992639b818
- Document Type :
- article
- Full Text :
- https://doi.org/10.5194/tc-7-1375-2013