Short-term velocity variations and sliding sensitivity of a slowly surging glacier
We use daily surface velocities measured over several weeks in 2007 and 2008 on a slowly surging glacier in Yukon, Canada, to examine the ordinary melt-season dynamics in the context of the ongoing surge. Horizontal velocities within and just below the ~1.5 km-long zone of fastest flow, where the su...
Published in: | Annals of Glaciology |
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Language: | English |
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Cambridge University Press
2016
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Online Access: | https://doi.org/10.1017/aog.2016.7 https://doaj.org/article/0b9b7301ad784ff2b92933e85509cb9d |
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ftdoajarticles:oai:doaj.org/article:0b9b7301ad784ff2b92933e85509cb9d 2023-05-15T13:29:30+02:00 Short-term velocity variations and sliding sensitivity of a slowly surging glacier Gwenn E. Flowers Alexander H. Jarosch Patrick T. A. P. Belliveau Lucas A. Fuhrman 2016-07-01T00:00:00Z https://doi.org/10.1017/aog.2016.7 https://doaj.org/article/0b9b7301ad784ff2b92933e85509cb9d EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0260305516000070/type/journal_article https://doaj.org/toc/0260-3055 https://doaj.org/toc/1727-5644 doi:10.1017/aog.2016.7 0260-3055 1727-5644 https://doaj.org/article/0b9b7301ad784ff2b92933e85509cb9d Annals of Glaciology, Vol 57, Pp 71-83 (2016) glacier flow glacier mechanics glacier surges mountain glaciers subglacial processes Meteorology. Climatology QC851-999 article 2016 ftdoajarticles https://doi.org/10.1017/aog.2016.7 2023-03-12T01:31:57Z We use daily surface velocities measured over several weeks in 2007 and 2008 on a slowly surging glacier in Yukon, Canada, to examine the ordinary melt-season dynamics in the context of the ongoing surge. Horizontal velocities within and just below the ~1.5 km-long zone of fastest flow, where the surge is occurring, are often correlated during intervals of low melt. This correlation breaks down during melt events, with the lower reaches of the fast-flow zone responding first. Velocity variability in this lower reach is most highly correlated with melt; velocities above and below appear to respond at least as strongly to the velocity variations of this reach as to local melt. GPS height records are suggestive of ice/bed separation occurring in the fast-flow zone but not below it, pointing to a hydrological cause for the short-term flow variability in the surging region. Independent velocity measurements over 6 years show a maximum July flow anomaly coincident with the location most responsive to melt. Results from a simple model of dashpots and frictional elements lend support to the hypothesis that this zone partly drives the dynamics of the ice above and below it. We speculate that the slow surge may enhance glacier sensitivity to melt-season processes, including short-term summer sliding events. Article in Journal/Newspaper Annals of Glaciology glacier* Yukon Directory of Open Access Journals: DOAJ Articles Yukon Canada Annals of Glaciology 57 72 71 83 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
glacier flow glacier mechanics glacier surges mountain glaciers subglacial processes Meteorology. Climatology QC851-999 |
spellingShingle |
glacier flow glacier mechanics glacier surges mountain glaciers subglacial processes Meteorology. Climatology QC851-999 Gwenn E. Flowers Alexander H. Jarosch Patrick T. A. P. Belliveau Lucas A. Fuhrman Short-term velocity variations and sliding sensitivity of a slowly surging glacier |
topic_facet |
glacier flow glacier mechanics glacier surges mountain glaciers subglacial processes Meteorology. Climatology QC851-999 |
description |
We use daily surface velocities measured over several weeks in 2007 and 2008 on a slowly surging glacier in Yukon, Canada, to examine the ordinary melt-season dynamics in the context of the ongoing surge. Horizontal velocities within and just below the ~1.5 km-long zone of fastest flow, where the surge is occurring, are often correlated during intervals of low melt. This correlation breaks down during melt events, with the lower reaches of the fast-flow zone responding first. Velocity variability in this lower reach is most highly correlated with melt; velocities above and below appear to respond at least as strongly to the velocity variations of this reach as to local melt. GPS height records are suggestive of ice/bed separation occurring in the fast-flow zone but not below it, pointing to a hydrological cause for the short-term flow variability in the surging region. Independent velocity measurements over 6 years show a maximum July flow anomaly coincident with the location most responsive to melt. Results from a simple model of dashpots and frictional elements lend support to the hypothesis that this zone partly drives the dynamics of the ice above and below it. We speculate that the slow surge may enhance glacier sensitivity to melt-season processes, including short-term summer sliding events. |
format |
Article in Journal/Newspaper |
author |
Gwenn E. Flowers Alexander H. Jarosch Patrick T. A. P. Belliveau Lucas A. Fuhrman |
author_facet |
Gwenn E. Flowers Alexander H. Jarosch Patrick T. A. P. Belliveau Lucas A. Fuhrman |
author_sort |
Gwenn E. Flowers |
title |
Short-term velocity variations and sliding sensitivity of a slowly surging glacier |
title_short |
Short-term velocity variations and sliding sensitivity of a slowly surging glacier |
title_full |
Short-term velocity variations and sliding sensitivity of a slowly surging glacier |
title_fullStr |
Short-term velocity variations and sliding sensitivity of a slowly surging glacier |
title_full_unstemmed |
Short-term velocity variations and sliding sensitivity of a slowly surging glacier |
title_sort |
short-term velocity variations and sliding sensitivity of a slowly surging glacier |
publisher |
Cambridge University Press |
publishDate |
2016 |
url |
https://doi.org/10.1017/aog.2016.7 https://doaj.org/article/0b9b7301ad784ff2b92933e85509cb9d |
geographic |
Yukon Canada |
geographic_facet |
Yukon Canada |
genre |
Annals of Glaciology glacier* Yukon |
genre_facet |
Annals of Glaciology glacier* Yukon |
op_source |
Annals of Glaciology, Vol 57, Pp 71-83 (2016) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0260305516000070/type/journal_article https://doaj.org/toc/0260-3055 https://doaj.org/toc/1727-5644 doi:10.1017/aog.2016.7 0260-3055 1727-5644 https://doaj.org/article/0b9b7301ad784ff2b92933e85509cb9d |
op_doi |
https://doi.org/10.1017/aog.2016.7 |
container_title |
Annals of Glaciology |
container_volume |
57 |
container_issue |
72 |
container_start_page |
71 |
op_container_end_page |
83 |
_version_ |
1766001006697512960 |