Character of the Englacial and Subglacial Drainage System in the Upper Part of the Ablation Area of Storglaciären, Sweden
Abstract On 4 July 1986, dye was injected at a point slightly above the equilibrium line on Storglaciären, a small valley glacier in northern Sweden. Just below the equilibrium line, the glacier bed is over-deepened. The dye re-appeared in a stream at the glacier terminus over the next 35 d. This st...
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Cambridge University Press (CUP)
1988
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Online Access: | http://dx.doi.org/10.1017/s0022143000032275 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000032275 |
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crcambridgeupr:10.1017/s0022143000032275 2024-09-15T18:15:39+00:00 Character of the Englacial and Subglacial Drainage System in the Upper Part of the Ablation Area of Storglaciären, Sweden Hooke, Roger Leb. Miller, Sarah B. Kohler, Jack 1988 http://dx.doi.org/10.1017/s0022143000032275 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000032275 en eng Cambridge University Press (CUP) Journal of Glaciology volume 34, issue 117, page 228-231 ISSN 0022-1430 1727-5652 journal-article 1988 crcambridgeupr https://doi.org/10.1017/s0022143000032275 2024-07-31T04:03:44Z Abstract On 4 July 1986, dye was injected at a point slightly above the equilibrium line on Storglaciären, a small valley glacier in northern Sweden. Just below the equilibrium line, the glacier bed is over-deepened. The dye re-appeared in a stream at the glacier terminus over the next 35 d. This stream normally carries relatively little sediment, in constrast to the situation in another nearby stream that also emerges from the glacier. This suggests that the dye traveled in englacial rather than subglacial conduits. Tracer tests utilizing salt in bore holes in the overdeepening support this interpretation, as the bore holes were draining well above the bed. The dye appeared during three distinct events, suggesting that it became divided into at least three separate parcels shortly after injection. This probably occurred in the crevassed area in the vicinity of the injection point. The englacial location of the drainage may be explained by the fact that, in order to remain at the pressure melting-point, water in subglacial conduits coming out of the overdeepening may have had to warm up faster than would be possible by viscous heating alone. Such conduits would thus tend to freeze closed. Article in Journal/Newspaper Journal of Glaciology Northern Sweden Cambridge University Press Journal of Glaciology 34 117 228 231 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract On 4 July 1986, dye was injected at a point slightly above the equilibrium line on Storglaciären, a small valley glacier in northern Sweden. Just below the equilibrium line, the glacier bed is over-deepened. The dye re-appeared in a stream at the glacier terminus over the next 35 d. This stream normally carries relatively little sediment, in constrast to the situation in another nearby stream that also emerges from the glacier. This suggests that the dye traveled in englacial rather than subglacial conduits. Tracer tests utilizing salt in bore holes in the overdeepening support this interpretation, as the bore holes were draining well above the bed. The dye appeared during three distinct events, suggesting that it became divided into at least three separate parcels shortly after injection. This probably occurred in the crevassed area in the vicinity of the injection point. The englacial location of the drainage may be explained by the fact that, in order to remain at the pressure melting-point, water in subglacial conduits coming out of the overdeepening may have had to warm up faster than would be possible by viscous heating alone. Such conduits would thus tend to freeze closed. |
format |
Article in Journal/Newspaper |
author |
Hooke, Roger Leb. Miller, Sarah B. Kohler, Jack |
spellingShingle |
Hooke, Roger Leb. Miller, Sarah B. Kohler, Jack Character of the Englacial and Subglacial Drainage System in the Upper Part of the Ablation Area of Storglaciären, Sweden |
author_facet |
Hooke, Roger Leb. Miller, Sarah B. Kohler, Jack |
author_sort |
Hooke, Roger Leb. |
title |
Character of the Englacial and Subglacial Drainage System in the Upper Part of the Ablation Area of Storglaciären, Sweden |
title_short |
Character of the Englacial and Subglacial Drainage System in the Upper Part of the Ablation Area of Storglaciären, Sweden |
title_full |
Character of the Englacial and Subglacial Drainage System in the Upper Part of the Ablation Area of Storglaciären, Sweden |
title_fullStr |
Character of the Englacial and Subglacial Drainage System in the Upper Part of the Ablation Area of Storglaciären, Sweden |
title_full_unstemmed |
Character of the Englacial and Subglacial Drainage System in the Upper Part of the Ablation Area of Storglaciären, Sweden |
title_sort |
character of the englacial and subglacial drainage system in the upper part of the ablation area of storglaciären, sweden |
publisher |
Cambridge University Press (CUP) |
publishDate |
1988 |
url |
http://dx.doi.org/10.1017/s0022143000032275 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000032275 |
genre |
Journal of Glaciology Northern Sweden |
genre_facet |
Journal of Glaciology Northern Sweden |
op_source |
Journal of Glaciology volume 34, issue 117, page 228-231 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000032275 |
container_title |
Journal of Glaciology |
container_volume |
34 |
container_issue |
117 |
container_start_page |
228 |
op_container_end_page |
231 |
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1810453571307569152 |