GPS determination of the velocity and strain-rate fields on Schirmacher Glacier, central Dronning Maud Land, Antarctica

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Abstract:

Global positioning system (GPS) campaigns were conducted during the 2003 and 2004 austral summer seasons to obtain insight into the velocity and strain-rate distribution on Schirmacher Glacier, central Dronning Maud Land, East Antarctica. GPS data were collected at 21 sites and analyzed to estimate the site coordinates, baselines and velocities. The short-term precision of the base station, MAIT, is estimated from the daily coordinate repeatability solutions during the two years. All GPS points on the glacier were constrained with respect to MAIT and nearby International GPS Service stations. Horizontal velocities of the glacier sites lie between 1.89±0.01 and 10.88±0.01 m a–1 to the north-northeast, with an average velocity of 6.21±0.01 m a–1. The principal strain rates provide a quantitative measurement of extension rates, which range from (0.11±0.01) × 10–3 to (1.48±0.85) × 10–3 a–1, and shortening rates, which range from (0.04±0.02) × 10–3 to (0.96±0.16) × 10–3 a–1. The velocity and strain-rate distributions across the GPS network in Schirmacher Glacier are spatially correlated with topography, subsurface undulations, fracture zones/crevasses and the partial blockage of the flow by nunataks and the Schirmacher Oasis.

Document Type: Research Article

DOI: http://dx.doi.org/10.3189/002214307784409199

Publication date: December 1, 2007

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  • The Journal of Glaciology is published six times per year. It accepts submissions from any discipline related to the study of snow and ice. All articles are peer reviewed. The Journal is included in the ISI Science Citation Index.
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