Modelling mass balance using photogrammetric and geophysical data: a pilot study at Griesgletscher, Swiss Alps
Abstract The kinematic boundary condition al the glacier surface can be used to give glacier mass balance at a point as a function of changes in the surface elevation, and of the horizontal and vertical velocities. Vertical velocity can in turn be estimated from basal slope, basal ice velocity and s...
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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/s0022143000001453 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000001453 |
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crcambridgeupr:10.1017/s0022143000001453 2024-06-23T07:54:15+00:00 Modelling mass balance using photogrammetric and geophysical data: a pilot study at Griesgletscher, Swiss Alps Kääb, Andreas Funk, Martin 1999 http://dx.doi.org/10.1017/s0022143000001453 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000001453 en eng Cambridge University Press (CUP) Journal of Glaciology volume 45, issue 151, page 575-583 ISSN 0022-1430 1727-5652 journal-article 1999 crcambridgeupr https://doi.org/10.1017/s0022143000001453 2024-06-05T04:01:17Z Abstract The kinematic boundary condition al the glacier surface can be used to give glacier mass balance at a point as a function of changes in the surface elevation, and of the horizontal and vertical velocities. Vertical velocity can in turn be estimated from basal slope, basal ice velocity and surface strain. In a pilot study on the tongue of Griesgletscher, Swiss Alps, the applicability of the relation for modelling area-wide ice flow and mass-balance distribution is tested. The key input of the calculations, i.e. the area-wide surface velocity field, is obtained using a newly developed photogrammetric technique. Ice thickness is derived from radar-echo soundings. Error estimates and comparisons with stake measurements show an average accuracy of approximately ±0.3 ma -1 for the calculated vertical ice velocity at the surface and ±0.7 ma -1 for the calculated mass balance. Due to photogrammetric restrictions and model-inherent sensitivities the applied model appeared to be most suitable for determining area-wide mass balance and ice flow on flat-lying ablation areas, but is so far not very well suited for steep ablation areas and most parts of accumulation areas. Nevertheless, the study on Griesgletscher opens a new and promising perspective for the monitoring of spatial and temporal glacier mass-balance variations. Article in Journal/Newspaper Journal of Glaciology Cambridge University Press Journal of Glaciology 45 151 575 583 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
Abstract The kinematic boundary condition al the glacier surface can be used to give glacier mass balance at a point as a function of changes in the surface elevation, and of the horizontal and vertical velocities. Vertical velocity can in turn be estimated from basal slope, basal ice velocity and surface strain. In a pilot study on the tongue of Griesgletscher, Swiss Alps, the applicability of the relation for modelling area-wide ice flow and mass-balance distribution is tested. The key input of the calculations, i.e. the area-wide surface velocity field, is obtained using a newly developed photogrammetric technique. Ice thickness is derived from radar-echo soundings. Error estimates and comparisons with stake measurements show an average accuracy of approximately ±0.3 ma -1 for the calculated vertical ice velocity at the surface and ±0.7 ma -1 for the calculated mass balance. Due to photogrammetric restrictions and model-inherent sensitivities the applied model appeared to be most suitable for determining area-wide mass balance and ice flow on flat-lying ablation areas, but is so far not very well suited for steep ablation areas and most parts of accumulation areas. Nevertheless, the study on Griesgletscher opens a new and promising perspective for the monitoring of spatial and temporal glacier mass-balance variations. |
format |
Article in Journal/Newspaper |
author |
Kääb, Andreas Funk, Martin |
spellingShingle |
Kääb, Andreas Funk, Martin Modelling mass balance using photogrammetric and geophysical data: a pilot study at Griesgletscher, Swiss Alps |
author_facet |
Kääb, Andreas Funk, Martin |
author_sort |
Kääb, Andreas |
title |
Modelling mass balance using photogrammetric and geophysical data: a pilot study at Griesgletscher, Swiss Alps |
title_short |
Modelling mass balance using photogrammetric and geophysical data: a pilot study at Griesgletscher, Swiss Alps |
title_full |
Modelling mass balance using photogrammetric and geophysical data: a pilot study at Griesgletscher, Swiss Alps |
title_fullStr |
Modelling mass balance using photogrammetric and geophysical data: a pilot study at Griesgletscher, Swiss Alps |
title_full_unstemmed |
Modelling mass balance using photogrammetric and geophysical data: a pilot study at Griesgletscher, Swiss Alps |
title_sort |
modelling mass balance using photogrammetric and geophysical data: a pilot study at griesgletscher, swiss alps |
publisher |
Cambridge University Press (CUP) |
publishDate |
1999 |
url |
http://dx.doi.org/10.1017/s0022143000001453 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000001453 |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology volume 45, issue 151, page 575-583 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000001453 |
container_title |
Journal of Glaciology |
container_volume |
45 |
container_issue |
151 |
container_start_page |
575 |
op_container_end_page |
583 |
_version_ |
1802646352016965632 |