Dynamics of a small surge-type glacier using one-dimensional geophysical inversion
ABSTRACT. We investigate the dynamics of a small surge-type valley glacier as part of a study to characterize glacier response to climate in the Donjek Range, southwest Yukon, Canada. Pole displacements were measured using kinematic GPS techniques during three consecutive summer field seasons. Measu...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.659.6599 2023-05-15T16:22:26+02:00 Dynamics of a small surge-type glacier using one-dimensional geophysical inversion Laetitia De Paoli Gwenn E. Flowers The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.659.6599 http://www.sfu.ca/%7Egflowers/pdf/DePaoli_and_Flowers_2009.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.659.6599 http://www.sfu.ca/%7Egflowers/pdf/DePaoli_and_Flowers_2009.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.sfu.ca/%7Egflowers/pdf/DePaoli_and_Flowers_2009.pdf text ftciteseerx 2016-01-08T16:46:51Z ABSTRACT. We investigate the dynamics of a small surge-type valley glacier as part of a study to characterize glacier response to climate in the Donjek Range, southwest Yukon, Canada. Pole displacements were measured using kinematic GPS techniques during three consecutive summer field seasons. Measured surface velocities range from <10ma−1 over the lower 1500m of the 5 km long glacier to a maximum of ∼25–35ma−1 over the upper 3500m. Basal velocities along an approximate flowline are reconstructed from the measured surface velocities using inverse methods. Control tests are used to validate the inversion scheme, and sensitivity tests are performed to evaluate the influence of the flow-law coefficient, shape factor and longitudinal averaging length. Inversion of the real data shows that basal motion accounts for 50–100 % of the total surface motion along the flowline. Based on these results, and several other lines of evidence, we suggest this glacier may be undergoing a slow surge. Text glacier* Long Glacier Yukon Unknown Canada Donjek Range ENVELOPE(-139.254,-139.254,61.083,61.083) Long Glacier ENVELOPE(-96.717,-96.717,-72.500,-72.500) Yukon |
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Open Polar |
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Unknown |
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ftciteseerx |
language |
English |
description |
ABSTRACT. We investigate the dynamics of a small surge-type valley glacier as part of a study to characterize glacier response to climate in the Donjek Range, southwest Yukon, Canada. Pole displacements were measured using kinematic GPS techniques during three consecutive summer field seasons. Measured surface velocities range from <10ma−1 over the lower 1500m of the 5 km long glacier to a maximum of ∼25–35ma−1 over the upper 3500m. Basal velocities along an approximate flowline are reconstructed from the measured surface velocities using inverse methods. Control tests are used to validate the inversion scheme, and sensitivity tests are performed to evaluate the influence of the flow-law coefficient, shape factor and longitudinal averaging length. Inversion of the real data shows that basal motion accounts for 50–100 % of the total surface motion along the flowline. Based on these results, and several other lines of evidence, we suggest this glacier may be undergoing a slow surge. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Laetitia De Paoli Gwenn E. Flowers |
spellingShingle |
Laetitia De Paoli Gwenn E. Flowers Dynamics of a small surge-type glacier using one-dimensional geophysical inversion |
author_facet |
Laetitia De Paoli Gwenn E. Flowers |
author_sort |
Laetitia De Paoli |
title |
Dynamics of a small surge-type glacier using one-dimensional geophysical inversion |
title_short |
Dynamics of a small surge-type glacier using one-dimensional geophysical inversion |
title_full |
Dynamics of a small surge-type glacier using one-dimensional geophysical inversion |
title_fullStr |
Dynamics of a small surge-type glacier using one-dimensional geophysical inversion |
title_full_unstemmed |
Dynamics of a small surge-type glacier using one-dimensional geophysical inversion |
title_sort |
dynamics of a small surge-type glacier using one-dimensional geophysical inversion |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.659.6599 http://www.sfu.ca/%7Egflowers/pdf/DePaoli_and_Flowers_2009.pdf |
long_lat |
ENVELOPE(-139.254,-139.254,61.083,61.083) ENVELOPE(-96.717,-96.717,-72.500,-72.500) |
geographic |
Canada Donjek Range Long Glacier Yukon |
geographic_facet |
Canada Donjek Range Long Glacier Yukon |
genre |
glacier* Long Glacier Yukon |
genre_facet |
glacier* Long Glacier Yukon |
op_source |
http://www.sfu.ca/%7Egflowers/pdf/DePaoli_and_Flowers_2009.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.659.6599 http://www.sfu.ca/%7Egflowers/pdf/DePaoli_and_Flowers_2009.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766010418427330560 |