Tidally Driven Ice Speed Variation at Helheim Glacier, Greenland, Observed with Terrestrial Radar Interferometry
We used a terrestrial radar interferometer (TRI) at Helheim Glacier, Greenland, in August 2013, to study the effects of tidal forcing on the terminal zone of this tidewater glacier. During our study period, the glacier velocity was up to 25 m d–1. Our measurements show that the glacier moves out of...
Published in: | Journal of Glaciology |
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Digital Commons @ University of South Florida
2015
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Online Access: | https://digitalcommons.usf.edu/geo_facpub/1532 https://doi.org/10.3189/2015JoG14J173 |
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ftusouthflorida:oai:digitalcommons.usf.edu:geo_facpub-2471 2023-07-30T04:03:36+02:00 Tidally Driven Ice Speed Variation at Helheim Glacier, Greenland, Observed with Terrestrial Radar Interferometry Voytenko, Denis Stern, Alon Hollander, David J. Dixon, Timothy H. Christianson, Knut Walker, Ryan T. 2015-01-01T08:00:00Z https://digitalcommons.usf.edu/geo_facpub/1532 https://doi.org/10.3189/2015JoG14J173 unknown Digital Commons @ University of South Florida https://digitalcommons.usf.edu/geo_facpub/1532 doi:10.3189/2015JoG14J173 https://doi.org/10.3189/2015JoG14J173 School of Geosciences Faculty and Staff Publications glacier flow glaciological instruments and methods ice dynamics ice/ocean interactions remote sensing Earth Sciences article 2015 ftusouthflorida https://doi.org/10.3189/2015JoG14J173 2023-07-13T20:43:52Z We used a terrestrial radar interferometer (TRI) at Helheim Glacier, Greenland, in August 2013, to study the effects of tidal forcing on the terminal zone of this tidewater glacier. During our study period, the glacier velocity was up to 25 m d–1. Our measurements show that the glacier moves out of phase with the semi-diurnal tides and the densely packed melange in the fjord. Here detrended glacier displacement lags behind the forecasted tidal height by ∼8 hours. The transition in phase lag between the glacier and the melange happens within a narrow (∼500 m) zone in the fjord in front of the ice cliff. The TRI data also suggest that the impact of tidal forcing decreases rapidly up-glacier of the terminus. A flowline model suggests this pattern of velocity perturbation is consistent with weak ice flowing over a weakly nonlinear bed. Article in Journal/Newspaper glacier Greenland Tidewater University of South Florida St. Petersburg: Digital USFSP Greenland Journal of Glaciology 61 226 301 308 |
institution |
Open Polar |
collection |
University of South Florida St. Petersburg: Digital USFSP |
op_collection_id |
ftusouthflorida |
language |
unknown |
topic |
glacier flow glaciological instruments and methods ice dynamics ice/ocean interactions remote sensing Earth Sciences |
spellingShingle |
glacier flow glaciological instruments and methods ice dynamics ice/ocean interactions remote sensing Earth Sciences Voytenko, Denis Stern, Alon Hollander, David J. Dixon, Timothy H. Christianson, Knut Walker, Ryan T. Tidally Driven Ice Speed Variation at Helheim Glacier, Greenland, Observed with Terrestrial Radar Interferometry |
topic_facet |
glacier flow glaciological instruments and methods ice dynamics ice/ocean interactions remote sensing Earth Sciences |
description |
We used a terrestrial radar interferometer (TRI) at Helheim Glacier, Greenland, in August 2013, to study the effects of tidal forcing on the terminal zone of this tidewater glacier. During our study period, the glacier velocity was up to 25 m d–1. Our measurements show that the glacier moves out of phase with the semi-diurnal tides and the densely packed melange in the fjord. Here detrended glacier displacement lags behind the forecasted tidal height by ∼8 hours. The transition in phase lag between the glacier and the melange happens within a narrow (∼500 m) zone in the fjord in front of the ice cliff. The TRI data also suggest that the impact of tidal forcing decreases rapidly up-glacier of the terminus. A flowline model suggests this pattern of velocity perturbation is consistent with weak ice flowing over a weakly nonlinear bed. |
format |
Article in Journal/Newspaper |
author |
Voytenko, Denis Stern, Alon Hollander, David J. Dixon, Timothy H. Christianson, Knut Walker, Ryan T. |
author_facet |
Voytenko, Denis Stern, Alon Hollander, David J. Dixon, Timothy H. Christianson, Knut Walker, Ryan T. |
author_sort |
Voytenko, Denis |
title |
Tidally Driven Ice Speed Variation at Helheim Glacier, Greenland, Observed with Terrestrial Radar Interferometry |
title_short |
Tidally Driven Ice Speed Variation at Helheim Glacier, Greenland, Observed with Terrestrial Radar Interferometry |
title_full |
Tidally Driven Ice Speed Variation at Helheim Glacier, Greenland, Observed with Terrestrial Radar Interferometry |
title_fullStr |
Tidally Driven Ice Speed Variation at Helheim Glacier, Greenland, Observed with Terrestrial Radar Interferometry |
title_full_unstemmed |
Tidally Driven Ice Speed Variation at Helheim Glacier, Greenland, Observed with Terrestrial Radar Interferometry |
title_sort |
tidally driven ice speed variation at helheim glacier, greenland, observed with terrestrial radar interferometry |
publisher |
Digital Commons @ University of South Florida |
publishDate |
2015 |
url |
https://digitalcommons.usf.edu/geo_facpub/1532 https://doi.org/10.3189/2015JoG14J173 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
glacier Greenland Tidewater |
genre_facet |
glacier Greenland Tidewater |
op_source |
School of Geosciences Faculty and Staff Publications |
op_relation |
https://digitalcommons.usf.edu/geo_facpub/1532 doi:10.3189/2015JoG14J173 https://doi.org/10.3189/2015JoG14J173 |
op_doi |
https://doi.org/10.3189/2015JoG14J173 |
container_title |
Journal of Glaciology |
container_volume |
61 |
container_issue |
226 |
container_start_page |
301 |
op_container_end_page |
308 |
_version_ |
1772814631097597952 |