Strong tidal variations in ice flow observed across the entire Ronne Ice Shelf and adjoining ice streams
We present a compilation of GPS time series, including those for previously unpublished sites, showing that flow across the entire Ronne Ice Shelf and its adjoining ice streams is strongly affected by ocean tides. Previous observations have shown strong horizontal diurnal and semidiurnal motion of t...
Published in: | Earth System Science Data |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Copernicus Publications
2017
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Online Access: | https://nrl.northumbria.ac.uk/id/eprint/34564/ https://doi.org/10.5194/essd-9-849-2017 https://nrl.northumbria.ac.uk/id/eprint/34564/1/Rosier%20et%20al%20-%20Strong%20tidal%20variations%20in%20ice%20flow%20observed%20across%20the%20entire%20Ronne%20Ice%20Shelf%20and%20adjoining%20ice%20streams%20OA.pdf |
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ftunivnorthumb:oai:nrl.northumbria.ac.uk:34564 2023-05-15T13:56:54+02:00 Strong tidal variations in ice flow observed across the entire Ronne Ice Shelf and adjoining ice streams Rosier, Sebastian Gudmundsson, Hilmar King, Matt Nicholls, Keith Makinson, Keith Corr, Hugh 2017-11-20 text https://nrl.northumbria.ac.uk/id/eprint/34564/ https://doi.org/10.5194/essd-9-849-2017 https://nrl.northumbria.ac.uk/id/eprint/34564/1/Rosier%20et%20al%20-%20Strong%20tidal%20variations%20in%20ice%20flow%20observed%20across%20the%20entire%20Ronne%20Ice%20Shelf%20and%20adjoining%20ice%20streams%20OA.pdf en eng Copernicus Publications https://nrl.northumbria.ac.uk/id/eprint/34564/1/Rosier%20et%20al%20-%20Strong%20tidal%20variations%20in%20ice%20flow%20observed%20across%20the%20entire%20Ronne%20Ice%20Shelf%20and%20adjoining%20ice%20streams%20OA.pdf Rosier, Sebastian, Gudmundsson, Hilmar, King, Matt, Nicholls, Keith, Makinson, Keith and Corr, Hugh (2017) Strong tidal variations in ice flow observed across the entire Ronne Ice Shelf and adjoining ice streams. Earth System Science Data, 9 (2). pp. 849-860. ISSN 1866-3508 cc_by_4_0 CC-BY F800 Physical and Terrestrial Geographical and Environmental Sciences Article PeerReviewed 2017 ftunivnorthumb https://doi.org/10.5194/essd-9-849-2017 2022-09-25T06:07:25Z We present a compilation of GPS time series, including those for previously unpublished sites, showing that flow across the entire Ronne Ice Shelf and its adjoining ice streams is strongly affected by ocean tides. Previous observations have shown strong horizontal diurnal and semidiurnal motion of the ice shelf, and surface flow speeds of Rutford Ice Stream (RIS) are known to vary with a fortnightly (Msf) periodicity. Our new data set shows that the Msf flow modulation, first observed on RIS, is also found on Evans, Talutis, Institute, and Foundation ice streams, i.e. on all ice streams for which data are available. The amplitude of the Msf signal increases downstream of grounding lines, reaching up to 20 % of mean flow speeds where ice streams feed into the main ice shelf. Upstream of ice stream grounding lines, decay length scales are relatively uniform for all ice streams but the speed at which the Msf signal propagates upstream shows more variation. Observations and modelling of tidal variations in ice flow can help constrain crucial parameters that determine the rate and extent of potential ice mass loss from Antarctica. Given that the Msf modulation in ice flow is readily observed across the entire region at distances of up to 80 km upstream of grounding lines, but is not completely reproduced in any existing numerical model, this new data set suggests a pressing need to identify the missing processes responsible for its generation and propagation. The new GPS data set is publicly available through the UK Polar Data Centre at http://doi.org/10.5285/4fe11286-0e53-4a03-854c-a79a44d1e356. Article in Journal/Newspaper Antarc* Antarctica Ice Shelf Ronne Ice Shelf Rutford Ice Stream Northumbria University, Newcastle: Northumbria Research Link (NRL) 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) Earth System Science Data 9 2 849 860 |
institution |
Open Polar |
collection |
Northumbria University, Newcastle: Northumbria Research Link (NRL) |
op_collection_id |
ftunivnorthumb |
language |
English |
topic |
F800 Physical and Terrestrial Geographical and Environmental Sciences |
spellingShingle |
F800 Physical and Terrestrial Geographical and Environmental Sciences Rosier, Sebastian Gudmundsson, Hilmar King, Matt Nicholls, Keith Makinson, Keith Corr, Hugh Strong tidal variations in ice flow observed across the entire Ronne Ice Shelf and adjoining ice streams |
topic_facet |
F800 Physical and Terrestrial Geographical and Environmental Sciences |
description |
We present a compilation of GPS time series, including those for previously unpublished sites, showing that flow across the entire Ronne Ice Shelf and its adjoining ice streams is strongly affected by ocean tides. Previous observations have shown strong horizontal diurnal and semidiurnal motion of the ice shelf, and surface flow speeds of Rutford Ice Stream (RIS) are known to vary with a fortnightly (Msf) periodicity. Our new data set shows that the Msf flow modulation, first observed on RIS, is also found on Evans, Talutis, Institute, and Foundation ice streams, i.e. on all ice streams for which data are available. The amplitude of the Msf signal increases downstream of grounding lines, reaching up to 20 % of mean flow speeds where ice streams feed into the main ice shelf. Upstream of ice stream grounding lines, decay length scales are relatively uniform for all ice streams but the speed at which the Msf signal propagates upstream shows more variation. Observations and modelling of tidal variations in ice flow can help constrain crucial parameters that determine the rate and extent of potential ice mass loss from Antarctica. Given that the Msf modulation in ice flow is readily observed across the entire region at distances of up to 80 km upstream of grounding lines, but is not completely reproduced in any existing numerical model, this new data set suggests a pressing need to identify the missing processes responsible for its generation and propagation. The new GPS data set is publicly available through the UK Polar Data Centre at http://doi.org/10.5285/4fe11286-0e53-4a03-854c-a79a44d1e356. |
format |
Article in Journal/Newspaper |
author |
Rosier, Sebastian Gudmundsson, Hilmar King, Matt Nicholls, Keith Makinson, Keith Corr, Hugh |
author_facet |
Rosier, Sebastian Gudmundsson, Hilmar King, Matt Nicholls, Keith Makinson, Keith Corr, Hugh |
author_sort |
Rosier, Sebastian |
title |
Strong tidal variations in ice flow observed across the entire Ronne Ice Shelf and adjoining ice streams |
title_short |
Strong tidal variations in ice flow observed across the entire Ronne Ice Shelf and adjoining ice streams |
title_full |
Strong tidal variations in ice flow observed across the entire Ronne Ice Shelf and adjoining ice streams |
title_fullStr |
Strong tidal variations in ice flow observed across the entire Ronne Ice Shelf and adjoining ice streams |
title_full_unstemmed |
Strong tidal variations in ice flow observed across the entire Ronne Ice Shelf and adjoining ice streams |
title_sort |
strong tidal variations in ice flow observed across the entire ronne ice shelf and adjoining ice streams |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://nrl.northumbria.ac.uk/id/eprint/34564/ https://doi.org/10.5194/essd-9-849-2017 https://nrl.northumbria.ac.uk/id/eprint/34564/1/Rosier%20et%20al%20-%20Strong%20tidal%20variations%20in%20ice%20flow%20observed%20across%20the%20entire%20Ronne%20Ice%20Shelf%20and%20adjoining%20ice%20streams%20OA.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 |
geographic_facet |
Ronne Ice Shelf Rutford Rutford Ice Stream |
genre |
Antarc* Antarctica Ice Shelf Ronne Ice Shelf Rutford Ice Stream |
genre_facet |
Antarc* Antarctica Ice Shelf Ronne Ice Shelf Rutford Ice Stream |
op_relation |
https://nrl.northumbria.ac.uk/id/eprint/34564/1/Rosier%20et%20al%20-%20Strong%20tidal%20variations%20in%20ice%20flow%20observed%20across%20the%20entire%20Ronne%20Ice%20Shelf%20and%20adjoining%20ice%20streams%20OA.pdf Rosier, Sebastian, Gudmundsson, Hilmar, King, Matt, Nicholls, Keith, Makinson, Keith and Corr, Hugh (2017) Strong tidal variations in ice flow observed across the entire Ronne Ice Shelf and adjoining ice streams. Earth System Science Data, 9 (2). pp. 849-860. ISSN 1866-3508 |
op_rights |
cc_by_4_0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/essd-9-849-2017 |
container_title |
Earth System Science Data |
container_volume |
9 |
container_issue |
2 |
container_start_page |
849 |
op_container_end_page |
860 |
_version_ |
1766264493460946944 |