Flow of Glaciar Moreno, Argentina, from repeat-pass Shuttle Imaging Radar images: comparison of the phase correlation method with radar interferometry
Abstract High-resolution radar images of Glaciar Moreno, Argentina, acquired by the Shuttle Imaging Radar C (SIR-C) on 9 and 10 October 1994 at 24 cm wavelength (L-band), are utilized to map the glacier velocity both interferometrically and using the phase correlation method. The precision of the in...
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Language: | English |
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Cambridge University Press (CUP)
1999
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Online Access: | http://dx.doi.org/10.1017/s0022143000003075 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000003075 |
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crcambridgeupr:10.1017/s0022143000003075 2024-06-23T07:54:15+00:00 Flow of Glaciar Moreno, Argentina, from repeat-pass Shuttle Imaging Radar images: comparison of the phase correlation method with radar interferometry Michel, Remi Rignot, Eric 1999 http://dx.doi.org/10.1017/s0022143000003075 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000003075 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Journal of Glaciology volume 45, issue 149, page 93-100 ISSN 0022-1430 1727-5652 journal-article 1999 crcambridgeupr https://doi.org/10.1017/s0022143000003075 2024-06-12T04:04:39Z Abstract High-resolution radar images of Glaciar Moreno, Argentina, acquired by the Shuttle Imaging Radar C (SIR-C) on 9 and 10 October 1994 at 24 cm wavelength (L-band), are utilized to map the glacier velocity both interferometrically and using the phase correlation method. The precision of the interferometric ice velocities is 1.8 cm d -1 (6 m a -1 ) (1 σ ). The phase correlation method measures ice velocity with a precision of 14 cm d -1 (50 m a -1 ) with image data at a 6 m sample spacing acquired 1 day apart. Averaged strain rates are measured with a precision of 10 -4 d -1 at a 240 m sample spacing with the phase correlation method, and 10 -5 d -l with radar interferometry. The phase correlation method is less precise than radar interferometry, but it performs better in areas of rapid flow, is more robust to temporal changes in glacier scattering and measures the glacier velocity in two dimensions with only one image pair. Using this technique, we find that Glaciar Moreno flows at 400 m a -1 in the terminal valley and 800 m a -1 at the calving front, in agreement with velocities recorded a decade ago. Assuming steady-state flow conditions, the vertical strain rates measured by SIR-C are combined with prior data on mass ablation to estimate the glacier thickness and ice discharge. The calculated discharge is 0.6 ± 0.2 km 3 ice a -1 at 300 m elevation, and 1.1 ± 0.2 km 3 ice a -1 at the equilibrium-line elevation (1150 m), which yields a balance accumulation of 6 ± 1 m ice a -1 . Article in Journal/Newspaper Journal of Glaciology Cambridge University Press Argentina Moreno ENVELOPE(-62.300,-62.300,-64.083,-64.083) Journal of Glaciology 45 149 93 100 |
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Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
Abstract High-resolution radar images of Glaciar Moreno, Argentina, acquired by the Shuttle Imaging Radar C (SIR-C) on 9 and 10 October 1994 at 24 cm wavelength (L-band), are utilized to map the glacier velocity both interferometrically and using the phase correlation method. The precision of the interferometric ice velocities is 1.8 cm d -1 (6 m a -1 ) (1 σ ). The phase correlation method measures ice velocity with a precision of 14 cm d -1 (50 m a -1 ) with image data at a 6 m sample spacing acquired 1 day apart. Averaged strain rates are measured with a precision of 10 -4 d -1 at a 240 m sample spacing with the phase correlation method, and 10 -5 d -l with radar interferometry. The phase correlation method is less precise than radar interferometry, but it performs better in areas of rapid flow, is more robust to temporal changes in glacier scattering and measures the glacier velocity in two dimensions with only one image pair. Using this technique, we find that Glaciar Moreno flows at 400 m a -1 in the terminal valley and 800 m a -1 at the calving front, in agreement with velocities recorded a decade ago. Assuming steady-state flow conditions, the vertical strain rates measured by SIR-C are combined with prior data on mass ablation to estimate the glacier thickness and ice discharge. The calculated discharge is 0.6 ± 0.2 km 3 ice a -1 at 300 m elevation, and 1.1 ± 0.2 km 3 ice a -1 at the equilibrium-line elevation (1150 m), which yields a balance accumulation of 6 ± 1 m ice a -1 . |
format |
Article in Journal/Newspaper |
author |
Michel, Remi Rignot, Eric |
spellingShingle |
Michel, Remi Rignot, Eric Flow of Glaciar Moreno, Argentina, from repeat-pass Shuttle Imaging Radar images: comparison of the phase correlation method with radar interferometry |
author_facet |
Michel, Remi Rignot, Eric |
author_sort |
Michel, Remi |
title |
Flow of Glaciar Moreno, Argentina, from repeat-pass Shuttle Imaging Radar images: comparison of the phase correlation method with radar interferometry |
title_short |
Flow of Glaciar Moreno, Argentina, from repeat-pass Shuttle Imaging Radar images: comparison of the phase correlation method with radar interferometry |
title_full |
Flow of Glaciar Moreno, Argentina, from repeat-pass Shuttle Imaging Radar images: comparison of the phase correlation method with radar interferometry |
title_fullStr |
Flow of Glaciar Moreno, Argentina, from repeat-pass Shuttle Imaging Radar images: comparison of the phase correlation method with radar interferometry |
title_full_unstemmed |
Flow of Glaciar Moreno, Argentina, from repeat-pass Shuttle Imaging Radar images: comparison of the phase correlation method with radar interferometry |
title_sort |
flow of glaciar moreno, argentina, from repeat-pass shuttle imaging radar images: comparison of the phase correlation method with radar interferometry |
publisher |
Cambridge University Press (CUP) |
publishDate |
1999 |
url |
http://dx.doi.org/10.1017/s0022143000003075 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000003075 |
long_lat |
ENVELOPE(-62.300,-62.300,-64.083,-64.083) |
geographic |
Argentina Moreno |
geographic_facet |
Argentina Moreno |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology volume 45, issue 149, page 93-100 ISSN 0022-1430 1727-5652 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0022143000003075 |
container_title |
Journal of Glaciology |
container_volume |
45 |
container_issue |
149 |
container_start_page |
93 |
op_container_end_page |
100 |
_version_ |
1802646330164641792 |