Comparison between computed balance velocities and GPS measurements in the Lambert Glacier basin, East Antarctica
Comparisons between computed balance velocities, obtained from two different computing schemes, and global positioning system (GPS)-derived velocities were made in the Lambert Glacier basin region, East Antarctica. The two computing schemes used for the balance-velocity computations (a flowline (FL)...
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2003
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Online Access: | https://eprints.utas.edu.au/8368/ https://eprints.utas.edu.au/8368/1/testut_2003.pdf https://doi.org/10.3189/172756403781815672 |
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ftunivtasmania:oai:eprints.utas.edu.au:8368 2023-05-15T13:29:43+02:00 Comparison between computed balance velocities and GPS measurements in the Lambert Glacier basin, East Antarctica Testut, L Hurd, R Coleman, R Frédérique, R Legresy, B 2003-06-01 application/pdf https://eprints.utas.edu.au/8368/ https://eprints.utas.edu.au/8368/1/testut_2003.pdf https://doi.org/10.3189/172756403781815672 en eng https://eprints.utas.edu.au/8368/1/testut_2003.pdf Testut, L, Hurd, R, Coleman, R, Frédérique, R and Legresy, B 2003 , 'Comparison between computed balance velocities and GPS measurements in the Lambert Glacier basin, East Antarctica' , Annals of Glaciology, vol. 37, no. 1 , pp. 337-343 , doi:10.3189/172756403781815672 <http://dx.doi.org/10.3189/172756403781815672>. cc_utas Article PeerReviewed 2003 ftunivtasmania https://doi.org/10.3189/172756403781815672 2020-05-30T07:22:12Z Comparisons between computed balance velocities, obtained from two different computing schemes, and global positioning system (GPS)-derived velocities were made in the Lambert Glacier basin region, East Antarctica. The two computing schemes used for the balance-velocity computations (a flowline (FL) scheme (Rémy and Minster, 1993) and a finite-difference (BW) scheme (Budd and Warner, 1996; Fricker and others, 2000)) were first evaluated and compared. One of the key issues studied was the spatial resolution of the digital elevation model (DEM), representing the surface topography of the ice sheet, and the sensitivity of the balance velocities to the length of smoothing applied to the DEM. Comparison with the GPS velocities validated the two schemes to within 5-25% but showed the high sensitivity of the flowline method to the length scale of the smoothing. The finite-difference scheme was found to be robust to the chosen smoothing scale, but the balance-velocity values increased when a finer-resolution DEM was used. Both FL and BW computing schemes tended to overestimate the balance velocities in comparison with the GPS values; some of this discrepancy can be attributed to ice-sheet sliding. Article in Journal/Newspaper Annals of Glaciology Antarc* Antarctica East Antarctica Ice Sheet Lambert Glacier University of Tasmania: UTas ePrints East Antarctica Lambert Glacier ENVELOPE(67.490,67.490,-73.065,-73.065) Fricker ENVELOPE(-65.000,-65.000,-67.050,-67.050) Annals of Glaciology 37 337 343 |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
English |
description |
Comparisons between computed balance velocities, obtained from two different computing schemes, and global positioning system (GPS)-derived velocities were made in the Lambert Glacier basin region, East Antarctica. The two computing schemes used for the balance-velocity computations (a flowline (FL) scheme (Rémy and Minster, 1993) and a finite-difference (BW) scheme (Budd and Warner, 1996; Fricker and others, 2000)) were first evaluated and compared. One of the key issues studied was the spatial resolution of the digital elevation model (DEM), representing the surface topography of the ice sheet, and the sensitivity of the balance velocities to the length of smoothing applied to the DEM. Comparison with the GPS velocities validated the two schemes to within 5-25% but showed the high sensitivity of the flowline method to the length scale of the smoothing. The finite-difference scheme was found to be robust to the chosen smoothing scale, but the balance-velocity values increased when a finer-resolution DEM was used. Both FL and BW computing schemes tended to overestimate the balance velocities in comparison with the GPS values; some of this discrepancy can be attributed to ice-sheet sliding. |
format |
Article in Journal/Newspaper |
author |
Testut, L Hurd, R Coleman, R Frédérique, R Legresy, B |
spellingShingle |
Testut, L Hurd, R Coleman, R Frédérique, R Legresy, B Comparison between computed balance velocities and GPS measurements in the Lambert Glacier basin, East Antarctica |
author_facet |
Testut, L Hurd, R Coleman, R Frédérique, R Legresy, B |
author_sort |
Testut, L |
title |
Comparison between computed balance velocities and GPS measurements in the Lambert Glacier basin, East Antarctica |
title_short |
Comparison between computed balance velocities and GPS measurements in the Lambert Glacier basin, East Antarctica |
title_full |
Comparison between computed balance velocities and GPS measurements in the Lambert Glacier basin, East Antarctica |
title_fullStr |
Comparison between computed balance velocities and GPS measurements in the Lambert Glacier basin, East Antarctica |
title_full_unstemmed |
Comparison between computed balance velocities and GPS measurements in the Lambert Glacier basin, East Antarctica |
title_sort |
comparison between computed balance velocities and gps measurements in the lambert glacier basin, east antarctica |
publishDate |
2003 |
url |
https://eprints.utas.edu.au/8368/ https://eprints.utas.edu.au/8368/1/testut_2003.pdf https://doi.org/10.3189/172756403781815672 |
long_lat |
ENVELOPE(67.490,67.490,-73.065,-73.065) ENVELOPE(-65.000,-65.000,-67.050,-67.050) |
geographic |
East Antarctica Lambert Glacier Fricker |
geographic_facet |
East Antarctica Lambert Glacier Fricker |
genre |
Annals of Glaciology Antarc* Antarctica East Antarctica Ice Sheet Lambert Glacier |
genre_facet |
Annals of Glaciology Antarc* Antarctica East Antarctica Ice Sheet Lambert Glacier |
op_relation |
https://eprints.utas.edu.au/8368/1/testut_2003.pdf Testut, L, Hurd, R, Coleman, R, Frédérique, R and Legresy, B 2003 , 'Comparison between computed balance velocities and GPS measurements in the Lambert Glacier basin, East Antarctica' , Annals of Glaciology, vol. 37, no. 1 , pp. 337-343 , doi:10.3189/172756403781815672 <http://dx.doi.org/10.3189/172756403781815672>. |
op_rights |
cc_utas |
op_doi |
https://doi.org/10.3189/172756403781815672 |
container_title |
Annals of Glaciology |
container_volume |
37 |
container_start_page |
337 |
op_container_end_page |
343 |
_version_ |
1766002329736183808 |