Deformation motion tracks sliding changes through summer, western Greenland
Surface speeds in Greenland's ablation zone undergo substantial variability on an annual basis which are presumed to mainly be driven by changes in sliding. Yet, meltwater-forced changes in ice–bed coupling can also produce variable deformation motion, which impacts the magnitude of sliding cha...
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Language: | English |
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Cambridge University Press
2022
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Online Access: | https://doi.org/10.1017/jog.2021.87 https://doaj.org/article/a92b9a5f8ef84966befef6882fe31a85 |
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ftdoajarticles:oai:doaj.org/article:a92b9a5f8ef84966befef6882fe31a85 2023-05-15T16:21:25+02:00 Deformation motion tracks sliding changes through summer, western Greenland Nathan Maier Neil Humphrey Toby Meierbachtol Joel Harper 2022-02-01T00:00:00Z https://doi.org/10.1017/jog.2021.87 https://doaj.org/article/a92b9a5f8ef84966befef6882fe31a85 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143021000873/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2021.87 0022-1430 1727-5652 https://doaj.org/article/a92b9a5f8ef84966befef6882fe31a85 Journal of Glaciology, Vol 68, Pp 187-196 (2022) Basal ice glacier flow ice dynamics Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2022 ftdoajarticles https://doi.org/10.1017/jog.2021.87 2023-03-12T01:30:57Z Surface speeds in Greenland's ablation zone undergo substantial variability on an annual basis which are presumed to mainly be driven by changes in sliding. Yet, meltwater-forced changes in ice–bed coupling can also produce variable deformation motion, which impacts the magnitude of sliding changes inferred from surface measurements and provides important context to flow dynamics. We examine spatiotemporal changes in deformation, sliding and surface velocities over a 2-year period using GPS and a dense network of inclinometers installed in borehole grid drilled in western Greenland's ablation zone. We find time variations in deformation motion track sliding changes through the summer and entire measurement period. A distinct spatial deformation and sliding pattern is also observed within the borehole grid which remains similar during winter and summer flow. We suggest that positively covarying sliding and deformation across seasonal timescales is characteristic of passive areas that are coupled to regions undergoing transient forcing, and the spatial patterns are consistent with variations in the local bed topography. The covarying deformation and sliding result in a 1.5–17% overestimate of sliding changes during summer compared to that inferred from surface velocity changes alone. This suggests that summer sliding increases are likely overestimated in many locations across Greenland. Article in Journal/Newspaper glacier Greenland Journal of Glaciology Directory of Open Access Journals: DOAJ Articles Greenland Journal of Glaciology 68 267 187 196 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Basal ice glacier flow ice dynamics Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
Basal ice glacier flow ice dynamics Environmental sciences GE1-350 Meteorology. Climatology QC851-999 Nathan Maier Neil Humphrey Toby Meierbachtol Joel Harper Deformation motion tracks sliding changes through summer, western Greenland |
topic_facet |
Basal ice glacier flow ice dynamics Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
description |
Surface speeds in Greenland's ablation zone undergo substantial variability on an annual basis which are presumed to mainly be driven by changes in sliding. Yet, meltwater-forced changes in ice–bed coupling can also produce variable deformation motion, which impacts the magnitude of sliding changes inferred from surface measurements and provides important context to flow dynamics. We examine spatiotemporal changes in deformation, sliding and surface velocities over a 2-year period using GPS and a dense network of inclinometers installed in borehole grid drilled in western Greenland's ablation zone. We find time variations in deformation motion track sliding changes through the summer and entire measurement period. A distinct spatial deformation and sliding pattern is also observed within the borehole grid which remains similar during winter and summer flow. We suggest that positively covarying sliding and deformation across seasonal timescales is characteristic of passive areas that are coupled to regions undergoing transient forcing, and the spatial patterns are consistent with variations in the local bed topography. The covarying deformation and sliding result in a 1.5–17% overestimate of sliding changes during summer compared to that inferred from surface velocity changes alone. This suggests that summer sliding increases are likely overestimated in many locations across Greenland. |
format |
Article in Journal/Newspaper |
author |
Nathan Maier Neil Humphrey Toby Meierbachtol Joel Harper |
author_facet |
Nathan Maier Neil Humphrey Toby Meierbachtol Joel Harper |
author_sort |
Nathan Maier |
title |
Deformation motion tracks sliding changes through summer, western Greenland |
title_short |
Deformation motion tracks sliding changes through summer, western Greenland |
title_full |
Deformation motion tracks sliding changes through summer, western Greenland |
title_fullStr |
Deformation motion tracks sliding changes through summer, western Greenland |
title_full_unstemmed |
Deformation motion tracks sliding changes through summer, western Greenland |
title_sort |
deformation motion tracks sliding changes through summer, western greenland |
publisher |
Cambridge University Press |
publishDate |
2022 |
url |
https://doi.org/10.1017/jog.2021.87 https://doaj.org/article/a92b9a5f8ef84966befef6882fe31a85 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
glacier Greenland Journal of Glaciology |
genre_facet |
glacier Greenland Journal of Glaciology |
op_source |
Journal of Glaciology, Vol 68, Pp 187-196 (2022) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143021000873/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2021.87 0022-1430 1727-5652 https://doaj.org/article/a92b9a5f8ef84966befef6882fe31a85 |
op_doi |
https://doi.org/10.1017/jog.2021.87 |
container_title |
Journal of Glaciology |
container_volume |
68 |
container_issue |
267 |
container_start_page |
187 |
op_container_end_page |
196 |
_version_ |
1766009420439879680 |