Water pressure and basal sliding on Storglaciären, northern Sweden
Abstract The subglacial hydrology of the ablation area of Storglaciären, a small valley glacier in northern Sweden, is dramatically affected by a subglacial ridge, or riegel. Water pressures above this riegel are relatively constant, while down-glacier from it they vary significantly. The lower part...
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Cambridge University Press (CUP)
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Online Access: | http://dx.doi.org/10.1017/s0022143000016130 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000016130 |
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crcambridgeupr:10.1017/s0022143000016130 2024-03-03T08:45:59+00:00 Water pressure and basal sliding on Storglaciären, northern Sweden Jansson, Peter 1995 http://dx.doi.org/10.1017/s0022143000016130 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000016130 en eng Cambridge University Press (CUP) Journal of Glaciology volume 41, issue 138, page 232-240 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1995 crcambridgeupr https://doi.org/10.1017/s0022143000016130 2024-02-08T08:36:15Z Abstract The subglacial hydrology of the ablation area of Storglaciären, a small valley glacier in northern Sweden, is dramatically affected by a subglacial ridge, or riegel. Water pressures above this riegel are relatively constant, while down-glacier from it they vary significantly. The lower part of the glacier accelerates in response to peaks in basal water pressure. The upper part may be weakly coupled to the lower part during these peaks. A power-law fit of observed basal water pressures and measured surface velocities yields where u s is the surface velocity and P E is the effective water pressure (ice overburden pressure minus subglacial water pressure). Data from Findelengletscher, reported by Iken and Bindschadler (1986), yield an identical exponent and a coefficient one order of magnitude larger. The similar exponent implies that the process producing the velocity variations on both glaciers is similar. The variations in velocity are inferred to be due to hydraulic jacking on both glaciers. Article in Journal/Newspaper Journal of Glaciology Northern Sweden Cambridge University Press Storglaciären ENVELOPE(18.560,18.560,67.904,67.904) Iken ENVELOPE(88.949,88.949,70.523,70.523) Journal of Glaciology 41 138 232 240 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Jansson, Peter Water pressure and basal sliding on Storglaciären, northern Sweden |
topic_facet |
Earth-Surface Processes |
description |
Abstract The subglacial hydrology of the ablation area of Storglaciären, a small valley glacier in northern Sweden, is dramatically affected by a subglacial ridge, or riegel. Water pressures above this riegel are relatively constant, while down-glacier from it they vary significantly. The lower part of the glacier accelerates in response to peaks in basal water pressure. The upper part may be weakly coupled to the lower part during these peaks. A power-law fit of observed basal water pressures and measured surface velocities yields where u s is the surface velocity and P E is the effective water pressure (ice overburden pressure minus subglacial water pressure). Data from Findelengletscher, reported by Iken and Bindschadler (1986), yield an identical exponent and a coefficient one order of magnitude larger. The similar exponent implies that the process producing the velocity variations on both glaciers is similar. The variations in velocity are inferred to be due to hydraulic jacking on both glaciers. |
format |
Article in Journal/Newspaper |
author |
Jansson, Peter |
author_facet |
Jansson, Peter |
author_sort |
Jansson, Peter |
title |
Water pressure and basal sliding on Storglaciären, northern Sweden |
title_short |
Water pressure and basal sliding on Storglaciären, northern Sweden |
title_full |
Water pressure and basal sliding on Storglaciären, northern Sweden |
title_fullStr |
Water pressure and basal sliding on Storglaciären, northern Sweden |
title_full_unstemmed |
Water pressure and basal sliding on Storglaciären, northern Sweden |
title_sort |
water pressure and basal sliding on storglaciären, northern sweden |
publisher |
Cambridge University Press (CUP) |
publishDate |
1995 |
url |
http://dx.doi.org/10.1017/s0022143000016130 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000016130 |
long_lat |
ENVELOPE(18.560,18.560,67.904,67.904) ENVELOPE(88.949,88.949,70.523,70.523) |
geographic |
Storglaciären Iken |
geographic_facet |
Storglaciären Iken |
genre |
Journal of Glaciology Northern Sweden |
genre_facet |
Journal of Glaciology Northern Sweden |
op_source |
Journal of Glaciology volume 41, issue 138, page 232-240 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000016130 |
container_title |
Journal of Glaciology |
container_volume |
41 |
container_issue |
138 |
container_start_page |
232 |
op_container_end_page |
240 |
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1792501748520189952 |