Ice flow modulated by tides at up to annual periods on Rutford Ice Stream, West Antarctica
For over 2-years we have collected GPS data similar to 40 km upstream of the grounding line on Rutford Ice Stream, West Antarctica. Here we examine deviations from mean downstream flow. Although the record is incomplete during winter, there is clear modulation of flow at semi-diurnal, diurnal, two-w...
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American Geophysical Union
2007
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Online Access: | http://nora.nerc.ac.uk/id/eprint/11842/ |
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ftnerc:oai:nora.nerc.ac.uk:11842 2023-05-15T13:45:10+02:00 Ice flow modulated by tides at up to annual periods on Rutford Ice Stream, West Antarctica Murray, T. Smith, A.M. King, M.A. Weedon, G.P. 2007 http://nora.nerc.ac.uk/id/eprint/11842/ unknown American Geophysical Union Murray, T.; Smith, A.M. orcid:0000-0001-8577-482X King, M.A.; Weedon, G.P. 2007 Ice flow modulated by tides at up to annual periods on Rutford Ice Stream, West Antarctica. Geophysical Research Letters, 34 (18), L18503. 6, pp. https://doi.org/10.1029/2007GL031207 <https://doi.org/10.1029/2007GL031207> Glaciology Publication - Article PeerReviewed 2007 ftnerc https://doi.org/10.1029/2007GL031207 2023-02-04T19:27:39Z For over 2-years we have collected GPS data similar to 40 km upstream of the grounding line on Rutford Ice Stream, West Antarctica. Here we examine deviations from mean downstream flow. Although the record is incomplete during winter, there is clear modulation of flow at semi-diurnal, diurnal, two-weekly, semi-annual, and annual ocean tidal frequencies. This is the first observation of ice stream flow variations over such a long time-period, and such a wide range of frequencies. The ice stream flows fastest at equinoxes when there are two semi-diurnal tides of equal magnitude, and slowest at solstices when one of the semi-diurnal tides has lower amplitude. The sensitivity of the downstream flow is greatest to the long-period forcing, which suggests that ice stream velocity may be affected by future changes in sea level. If so, this effect would provide a feedback whereby rising sea levels could increase ice stream velocity and hence discharge. Article in Journal/Newspaper Antarc* Antarctica Rutford Ice Stream West Antarctica Natural Environment Research Council: NERC Open Research Archive West Antarctica Rutford ENVELOPE(-85.300,-85.300,-78.600,-78.600) Rutford Ice Stream ENVELOPE(-80.000,-80.000,-79.167,-79.167) Geophysical Research Letters 34 18 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
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unknown |
topic |
Glaciology |
spellingShingle |
Glaciology Murray, T. Smith, A.M. King, M.A. Weedon, G.P. Ice flow modulated by tides at up to annual periods on Rutford Ice Stream, West Antarctica |
topic_facet |
Glaciology |
description |
For over 2-years we have collected GPS data similar to 40 km upstream of the grounding line on Rutford Ice Stream, West Antarctica. Here we examine deviations from mean downstream flow. Although the record is incomplete during winter, there is clear modulation of flow at semi-diurnal, diurnal, two-weekly, semi-annual, and annual ocean tidal frequencies. This is the first observation of ice stream flow variations over such a long time-period, and such a wide range of frequencies. The ice stream flows fastest at equinoxes when there are two semi-diurnal tides of equal magnitude, and slowest at solstices when one of the semi-diurnal tides has lower amplitude. The sensitivity of the downstream flow is greatest to the long-period forcing, which suggests that ice stream velocity may be affected by future changes in sea level. If so, this effect would provide a feedback whereby rising sea levels could increase ice stream velocity and hence discharge. |
format |
Article in Journal/Newspaper |
author |
Murray, T. Smith, A.M. King, M.A. Weedon, G.P. |
author_facet |
Murray, T. Smith, A.M. King, M.A. Weedon, G.P. |
author_sort |
Murray, T. |
title |
Ice flow modulated by tides at up to annual periods on Rutford Ice Stream, West Antarctica |
title_short |
Ice flow modulated by tides at up to annual periods on Rutford Ice Stream, West Antarctica |
title_full |
Ice flow modulated by tides at up to annual periods on Rutford Ice Stream, West Antarctica |
title_fullStr |
Ice flow modulated by tides at up to annual periods on Rutford Ice Stream, West Antarctica |
title_full_unstemmed |
Ice flow modulated by tides at up to annual periods on Rutford Ice Stream, West Antarctica |
title_sort |
ice flow modulated by tides at up to annual periods on rutford ice stream, west antarctica |
publisher |
American Geophysical Union |
publishDate |
2007 |
url |
http://nora.nerc.ac.uk/id/eprint/11842/ |
long_lat |
ENVELOPE(-85.300,-85.300,-78.600,-78.600) ENVELOPE(-80.000,-80.000,-79.167,-79.167) |
geographic |
West Antarctica Rutford Rutford Ice Stream |
geographic_facet |
West Antarctica Rutford Rutford Ice Stream |
genre |
Antarc* Antarctica Rutford Ice Stream West Antarctica |
genre_facet |
Antarc* Antarctica Rutford Ice Stream West Antarctica |
op_relation |
Murray, T.; Smith, A.M. orcid:0000-0001-8577-482X King, M.A.; Weedon, G.P. 2007 Ice flow modulated by tides at up to annual periods on Rutford Ice Stream, West Antarctica. Geophysical Research Letters, 34 (18), L18503. 6, pp. https://doi.org/10.1029/2007GL031207 <https://doi.org/10.1029/2007GL031207> |
op_doi |
https://doi.org/10.1029/2007GL031207 |
container_title |
Geophysical Research Letters |
container_volume |
34 |
container_issue |
18 |
_version_ |
1766214774769582080 |