TERRAPUB Earth, Planets and Space

Earth Planets Space, Vol. 52 (No. 11), pp. 1031-1036, 2000

LETTER

Ice velocities of the Lambert Glacier from static GPS observations

Rachael Manson1, Richard Coleman1,2, Peter Morgan3, and Matt King1

1Centre for Spatial Information Science, University of Tasmania, GPO Box 252-76, Hobart, Tasmania 7001, Australia
2CSIRO Marine Research, GPO Box 1538, Hobart, Tasmania 7001, Australia
3School of Computing, University of Canberra, PO Box 1, Belconnen, Australian Capital Territory 2616, Australia

(Received December 25, 1999; Revised June 21, 2000; Accepted June 29, 2000)

Abstract: Between 1988 and 1995, five seasons of Global Positioning System (GPS) data were collected at seventy-three locations near the 2500 metre contour of the Lambert Glacier Drainage Basin (LGB). These data have been processed using GAMIT/GlobK software to determine surface velocities at the surveyed sites. Results show that velocities along the traverse route vary between 0.5 ma-1 and 63 ma-1 with the location of the major outlet glaciers inside the LGB clearly identifiable within the data. A subset of the LGB GPS data has been studied to investigate an efficient method for determination of ice velocities at remote sites within a single field season. Results from this study have shown that ice velocities within 2% of the long-term estimate may be determined using two to four hour GPS site occupations separated in time by a minimum of forty days.


Corresponding author E-mail: r manson@postoffice.utas.edu.au


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