A novel tilt sensor for studying ice deformation: application to streaming ice on Jarvis Glacier, Alaska
We developed a tilt sensor for studying ice deformation and installed our tilt sensor systems in two boreholes drilled close to the shear margin of Jarvis Glacier, Alaska to obtain kinematic measurements of streaming ice. We used the collected tilt data to calculate borehole deformation by tracking...
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Cambridge University Press
2020
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Online Access: | https://doi.org/10.1017/jog.2019.84 https://doaj.org/article/80da70a82f7e4e1d816b81e6eaf76655 |
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ftdoajarticles:oai:doaj.org/article:80da70a82f7e4e1d816b81e6eaf76655 2023-05-15T16:20:24+02:00 A novel tilt sensor for studying ice deformation: application to streaming ice on Jarvis Glacier, Alaska Ian R. Lee Robert L. Hawley Steven Bernsen Seth W. Campbell David Clemens-Sewall Christopher C. Gerbi Kate Hruby 2020-02-01T00:00:00Z https://doi.org/10.1017/jog.2019.84 https://doaj.org/article/80da70a82f7e4e1d816b81e6eaf76655 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143019000844/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2019.84 0022-1430 1727-5652 https://doaj.org/article/80da70a82f7e4e1d816b81e6eaf76655 Journal of Glaciology, Vol 66, Pp 74-82 (2020) Anisotropic ice flow glaciological instruments and methods glacier geophysics Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2020 ftdoajarticles https://doi.org/10.1017/jog.2019.84 2023-03-12T01:30:57Z We developed a tilt sensor for studying ice deformation and installed our tilt sensor systems in two boreholes drilled close to the shear margin of Jarvis Glacier, Alaska to obtain kinematic measurements of streaming ice. We used the collected tilt data to calculate borehole deformation by tracking the orientation of the sensors over time. The sensors' tilts generally trended down-glacier, with an element of cross-glacier flow in the borehole closer to the shear margin. We also evaluated our results against flow dynamic parameters derived from Glen's exponential flow law and explored the parameter space of the stress exponent n and enhancement factor E. Comparison with values from ice deformation experiments shows that the ice on Jarvis is characterized by higher n values than that is expected in regions of low stress, particularly at the shear margin (~3.4). The higher n values could be attributed to the observed high total strains coupled with potential dynamic recrystallization, causing anisotropic development and consequently sped up ice flow. Jarvis' n values place the creep regime of the ice between basal slip and dislocation creep. Tuning E towards a theoretical upper limit of 10 for anisotropic ice with single-maximum fabric reduces the n values by 0.2. Article in Journal/Newspaper glacier Journal of Glaciology Alaska Directory of Open Access Journals: DOAJ Articles Jarvis Glacier ENVELOPE(-136.537,-136.537,59.449,59.449) Journal of Glaciology 66 255 74 82 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Anisotropic ice flow glaciological instruments and methods glacier geophysics Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
Anisotropic ice flow glaciological instruments and methods glacier geophysics Environmental sciences GE1-350 Meteorology. Climatology QC851-999 Ian R. Lee Robert L. Hawley Steven Bernsen Seth W. Campbell David Clemens-Sewall Christopher C. Gerbi Kate Hruby A novel tilt sensor for studying ice deformation: application to streaming ice on Jarvis Glacier, Alaska |
topic_facet |
Anisotropic ice flow glaciological instruments and methods glacier geophysics Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
description |
We developed a tilt sensor for studying ice deformation and installed our tilt sensor systems in two boreholes drilled close to the shear margin of Jarvis Glacier, Alaska to obtain kinematic measurements of streaming ice. We used the collected tilt data to calculate borehole deformation by tracking the orientation of the sensors over time. The sensors' tilts generally trended down-glacier, with an element of cross-glacier flow in the borehole closer to the shear margin. We also evaluated our results against flow dynamic parameters derived from Glen's exponential flow law and explored the parameter space of the stress exponent n and enhancement factor E. Comparison with values from ice deformation experiments shows that the ice on Jarvis is characterized by higher n values than that is expected in regions of low stress, particularly at the shear margin (~3.4). The higher n values could be attributed to the observed high total strains coupled with potential dynamic recrystallization, causing anisotropic development and consequently sped up ice flow. Jarvis' n values place the creep regime of the ice between basal slip and dislocation creep. Tuning E towards a theoretical upper limit of 10 for anisotropic ice with single-maximum fabric reduces the n values by 0.2. |
format |
Article in Journal/Newspaper |
author |
Ian R. Lee Robert L. Hawley Steven Bernsen Seth W. Campbell David Clemens-Sewall Christopher C. Gerbi Kate Hruby |
author_facet |
Ian R. Lee Robert L. Hawley Steven Bernsen Seth W. Campbell David Clemens-Sewall Christopher C. Gerbi Kate Hruby |
author_sort |
Ian R. Lee |
title |
A novel tilt sensor for studying ice deformation: application to streaming ice on Jarvis Glacier, Alaska |
title_short |
A novel tilt sensor for studying ice deformation: application to streaming ice on Jarvis Glacier, Alaska |
title_full |
A novel tilt sensor for studying ice deformation: application to streaming ice on Jarvis Glacier, Alaska |
title_fullStr |
A novel tilt sensor for studying ice deformation: application to streaming ice on Jarvis Glacier, Alaska |
title_full_unstemmed |
A novel tilt sensor for studying ice deformation: application to streaming ice on Jarvis Glacier, Alaska |
title_sort |
novel tilt sensor for studying ice deformation: application to streaming ice on jarvis glacier, alaska |
publisher |
Cambridge University Press |
publishDate |
2020 |
url |
https://doi.org/10.1017/jog.2019.84 https://doaj.org/article/80da70a82f7e4e1d816b81e6eaf76655 |
long_lat |
ENVELOPE(-136.537,-136.537,59.449,59.449) |
geographic |
Jarvis Glacier |
geographic_facet |
Jarvis Glacier |
genre |
glacier Journal of Glaciology Alaska |
genre_facet |
glacier Journal of Glaciology Alaska |
op_source |
Journal of Glaciology, Vol 66, Pp 74-82 (2020) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143019000844/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2019.84 0022-1430 1727-5652 https://doaj.org/article/80da70a82f7e4e1d816b81e6eaf76655 |
op_doi |
https://doi.org/10.1017/jog.2019.84 |
container_title |
Journal of Glaciology |
container_volume |
66 |
container_issue |
255 |
container_start_page |
74 |
op_container_end_page |
82 |
_version_ |
1766008318963220480 |