Tides and the flow of Rutford Ice Stream, West Antarctica
[1] Surface speeds of Rutford Ice Stream, West Antarctica, are known to vary by around 10–20% (depending on location) with a fortnightly periodicity corresponding to a springneap tidal cycle. The reasons for these periodic variations in flow are unclear. Here the possible role of tidal stress transm...
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American Geophysical Union
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ftnerc:oai:nora.nerc.ac.uk:11746 2023-05-15T13:45:10+02:00 Tides and the flow of Rutford Ice Stream, West Antarctica Gudmundsson, G. Hilmar 2007 text http://nora.nerc.ac.uk/id/eprint/11746/ https://nora.nerc.ac.uk/id/eprint/11746/1/2006JF000731.pdf http://www.agu.org/journals/jf/jf0704/2006JF000731/2006JF000731.pdf en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/11746/1/2006JF000731.pdf Gudmundsson, G. Hilmar orcid:0000-0003-4236-5369 . 2007 Tides and the flow of Rutford Ice Stream, West Antarctica. Journal of Geophysical Research, 122 (F4), F04007. 8, pp. https://doi.org/10.1029/2006JF000731 <https://doi.org/10.1029/2006JF000731> Glaciology Hydrology Publication - Article PeerReviewed 2007 ftnerc https://doi.org/10.1029/2006JF000731 2023-02-04T19:27:34Z [1] Surface speeds of Rutford Ice Stream, West Antarctica, are known to vary by around 10–20% (depending on location) with a fortnightly periodicity corresponding to a springneap tidal cycle. The reasons for these periodic variations in flow are unclear. Here the possible role of tidal stress transmission upstream of the grounding line in affecting rates of basal motion is investigated. It is found that nonlinear rheological effects within the till, when coupled with transmission of tidal stresses within the ice that are linearly related to tidal amplitude, can give rise to the type of periodic oscillations in flow observed. This nonlinear interaction between tidal forcing and till deformation increases the mean ice flux across the grounding line by a few percent above what might be expected in the absence of tidal forcing. Periodic velocity fluctuations of this type have not been observed on other ice streams. However, modeling suggests that this may be due to lack of data and that such flow variations are likely to be common features of active ice streams draining into the Ronne Ice Shelf, as well as of other ice streams subjected to similar tidal forcing. Article in Journal/Newspaper Antarc* Antarctica Antarctica Journal Ice Shelf Ronne Ice Shelf Rutford Ice Stream West Antarctica Natural Environment Research Council: NERC Open Research Archive Ronne Ice Shelf ENVELOPE(-61.000,-61.000,-78.500,-78.500) Rutford ENVELOPE(-85.300,-85.300,-78.600,-78.600) Rutford Ice Stream ENVELOPE(-80.000,-80.000,-79.167,-79.167) West Antarctica Journal of Geophysical Research 112 F4 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
topic |
Glaciology Hydrology |
spellingShingle |
Glaciology Hydrology Gudmundsson, G. Hilmar Tides and the flow of Rutford Ice Stream, West Antarctica |
topic_facet |
Glaciology Hydrology |
description |
[1] Surface speeds of Rutford Ice Stream, West Antarctica, are known to vary by around 10–20% (depending on location) with a fortnightly periodicity corresponding to a springneap tidal cycle. The reasons for these periodic variations in flow are unclear. Here the possible role of tidal stress transmission upstream of the grounding line in affecting rates of basal motion is investigated. It is found that nonlinear rheological effects within the till, when coupled with transmission of tidal stresses within the ice that are linearly related to tidal amplitude, can give rise to the type of periodic oscillations in flow observed. This nonlinear interaction between tidal forcing and till deformation increases the mean ice flux across the grounding line by a few percent above what might be expected in the absence of tidal forcing. Periodic velocity fluctuations of this type have not been observed on other ice streams. However, modeling suggests that this may be due to lack of data and that such flow variations are likely to be common features of active ice streams draining into the Ronne Ice Shelf, as well as of other ice streams subjected to similar tidal forcing. |
format |
Article in Journal/Newspaper |
author |
Gudmundsson, G. Hilmar |
author_facet |
Gudmundsson, G. Hilmar |
author_sort |
Gudmundsson, G. Hilmar |
title |
Tides and the flow of Rutford Ice Stream, West Antarctica |
title_short |
Tides and the flow of Rutford Ice Stream, West Antarctica |
title_full |
Tides and the flow of Rutford Ice Stream, West Antarctica |
title_fullStr |
Tides and the flow of Rutford Ice Stream, West Antarctica |
title_full_unstemmed |
Tides and the flow of Rutford Ice Stream, West Antarctica |
title_sort |
tides and the flow of rutford ice stream, west antarctica |
publisher |
American Geophysical Union |
publishDate |
2007 |
url |
http://nora.nerc.ac.uk/id/eprint/11746/ https://nora.nerc.ac.uk/id/eprint/11746/1/2006JF000731.pdf http://www.agu.org/journals/jf/jf0704/2006JF000731/2006JF000731.pdf |
long_lat |
ENVELOPE(-61.000,-61.000,-78.500,-78.500) ENVELOPE(-85.300,-85.300,-78.600,-78.600) ENVELOPE(-80.000,-80.000,-79.167,-79.167) |
geographic |
Ronne Ice Shelf Rutford Rutford Ice Stream West Antarctica |
geographic_facet |
Ronne Ice Shelf Rutford Rutford Ice Stream West Antarctica |
genre |
Antarc* Antarctica Antarctica Journal Ice Shelf Ronne Ice Shelf Rutford Ice Stream West Antarctica |
genre_facet |
Antarc* Antarctica Antarctica Journal Ice Shelf Ronne Ice Shelf Rutford Ice Stream West Antarctica |
op_relation |
https://nora.nerc.ac.uk/id/eprint/11746/1/2006JF000731.pdf Gudmundsson, G. Hilmar orcid:0000-0003-4236-5369 . 2007 Tides and the flow of Rutford Ice Stream, West Antarctica. Journal of Geophysical Research, 122 (F4), F04007. 8, pp. https://doi.org/10.1029/2006JF000731 <https://doi.org/10.1029/2006JF000731> |
op_doi |
https://doi.org/10.1029/2006JF000731 |
container_title |
Journal of Geophysical Research |
container_volume |
112 |
container_issue |
F4 |
_version_ |
1766214732906233856 |