Accuracy of three-dimensional glacier surface volocities derived from radar interfeometry and ice-soundin radar measurements
We present a method for analyzing the errors involved in measuring three-dimensional glacier velocities with interferometric radar. We address the surface-parallel flow assumption and an augmented approach with a flux-divergence (FD) term. The errors in an interferometric ERS-1/-2 satellite radar da...
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2003
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ftdtupubl:oai:pure.atira.dk:publications/f910767a-7535-40cf-b3a3-12eb3bf77e6e 2023-05-15T16:21:14+02:00 Accuracy of three-dimensional glacier surface volocities derived from radar interfeometry and ice-soundin radar measurements Mohr, Johan Jacob Reeh, Niels Madsen, Søren Nørvang 2003 https://orbit.dtu.dk/en/publications/f910767a-7535-40cf-b3a3-12eb3bf77e6e http://www.oersted.dtu.dk/publications/p.php?536 eng eng info:eu-repo/semantics/restrictedAccess Mohr , J J , Reeh , N & Madsen , S N 2003 , ' Accuracy of three-dimensional glacier surface volocities derived from radar interfeometry and ice-soundin radar measurements ' , Journal of Glaciology , vol. 49 , no. 165 , pp. 210-222 . < http://www.oersted.dtu.dk/publications/p.php?536 > article 2003 ftdtupubl 2023-01-11T23:53:01Z We present a method for analyzing the errors involved in measuring three-dimensional glacier velocities with interferometric radar. We address the surface-parallel flow assumption and an augmented approach with a flux-divergence (FD) term. The errors in an interferometric ERS-1/-2 satellite radar dataset with ascending- and descending-orbit data covering Storstrommen glacier, northeast Greenland, are assessed. The FD error assessment is carried out on airborne 60 MHz ice-sounding radar data from the same area. A simple model of an interferometric radar system is developed and analyzed. The error sources considered include phase noise, atmospheric distortions, baseline calibration errors, a dry snow layer, and the stationary-flow assumption used in differential interferometry. The additional error sources in the analysis of FD errors are noise, bias and unknown variations of the ice thickness, and approximations of the ice-flow model. The example glacier is now building up following a surge. The analysis shows that in the case study presented the errors are small enough to justify the use of both the estimated surface-parallel flow term of the vertical velocity and the estimated FD term of the vertical velocity. Article in Journal/Newspaper glacier Greenland Journal of Glaciology Technical University of Denmark: DTU Orbit Greenland |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
description |
We present a method for analyzing the errors involved in measuring three-dimensional glacier velocities with interferometric radar. We address the surface-parallel flow assumption and an augmented approach with a flux-divergence (FD) term. The errors in an interferometric ERS-1/-2 satellite radar dataset with ascending- and descending-orbit data covering Storstrommen glacier, northeast Greenland, are assessed. The FD error assessment is carried out on airborne 60 MHz ice-sounding radar data from the same area. A simple model of an interferometric radar system is developed and analyzed. The error sources considered include phase noise, atmospheric distortions, baseline calibration errors, a dry snow layer, and the stationary-flow assumption used in differential interferometry. The additional error sources in the analysis of FD errors are noise, bias and unknown variations of the ice thickness, and approximations of the ice-flow model. The example glacier is now building up following a surge. The analysis shows that in the case study presented the errors are small enough to justify the use of both the estimated surface-parallel flow term of the vertical velocity and the estimated FD term of the vertical velocity. |
format |
Article in Journal/Newspaper |
author |
Mohr, Johan Jacob Reeh, Niels Madsen, Søren Nørvang |
spellingShingle |
Mohr, Johan Jacob Reeh, Niels Madsen, Søren Nørvang Accuracy of three-dimensional glacier surface volocities derived from radar interfeometry and ice-soundin radar measurements |
author_facet |
Mohr, Johan Jacob Reeh, Niels Madsen, Søren Nørvang |
author_sort |
Mohr, Johan Jacob |
title |
Accuracy of three-dimensional glacier surface volocities derived from radar interfeometry and ice-soundin radar measurements |
title_short |
Accuracy of three-dimensional glacier surface volocities derived from radar interfeometry and ice-soundin radar measurements |
title_full |
Accuracy of three-dimensional glacier surface volocities derived from radar interfeometry and ice-soundin radar measurements |
title_fullStr |
Accuracy of three-dimensional glacier surface volocities derived from radar interfeometry and ice-soundin radar measurements |
title_full_unstemmed |
Accuracy of three-dimensional glacier surface volocities derived from radar interfeometry and ice-soundin radar measurements |
title_sort |
accuracy of three-dimensional glacier surface volocities derived from radar interfeometry and ice-soundin radar measurements |
publishDate |
2003 |
url |
https://orbit.dtu.dk/en/publications/f910767a-7535-40cf-b3a3-12eb3bf77e6e http://www.oersted.dtu.dk/publications/p.php?536 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
glacier Greenland Journal of Glaciology |
genre_facet |
glacier Greenland Journal of Glaciology |
op_source |
Mohr , J J , Reeh , N & Madsen , S N 2003 , ' Accuracy of three-dimensional glacier surface volocities derived from radar interfeometry and ice-soundin radar measurements ' , Journal of Glaciology , vol. 49 , no. 165 , pp. 210-222 . < http://www.oersted.dtu.dk/publications/p.php?536 > |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1766009242277380096 |