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We present a compilation of GPS time series, including those for previously unpublished sites, showing that flow across the entire Ronne Ice Shelf and its adjoining ice streams is strongly affected by ocean tides.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...
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Online Access: | https://doi.org/10.5194/essd-9-849-2017 http://ecite.utas.edu.au/122667 |
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ftunivtasecite:oai:ecite.utas.edu.au:122667 2023-05-15T13:42:40+02:00 Strong tidal variations in ice flow observed across the entire Ronne Ice Shelf and adjoining ice streams Rosier, SHR Gudmundsson, GH King, MA Nicholls, KW Makinson, K Corr, HFJ 2017 application/pdf https://doi.org/10.5194/essd-9-849-2017 http://ecite.utas.edu.au/122667 en eng Copernicus GmbH http://ecite.utas.edu.au/122667/1/essd-9-849-2017.pdf http://dx.doi.org/10.5194/essd-9-849-2017 http://purl.org/au-research/grants/arc/FT110100207 Rosier, SHR and Gudmundsson, GH and King, MA and Nicholls, KW and Makinson, K and Corr, HFJ, Strong tidal variations in ice flow observed across the entire Ronne Ice Shelf and adjoining ice streams, Earth System Science Data, 9 pp. 849-860. ISSN 1866-3508 (2017) [Refereed Article] http://ecite.utas.edu.au/122667 Earth Sciences Geophysics Geodesy Refereed Article PeerReviewed 2017 ftunivtasecite https://doi.org/10.5194/essd-9-849-2017 2022-08-30T09:11:42Z We present a compilation of GPS time series, including those for previously unpublished sites, showing that flow across the entire Ronne Ice Shelf and its adjoining ice streams is strongly affected by ocean tides.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 (M sf ) periodicity. Our new data set shows that the M sf 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 M sf 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 M sf 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 M sf 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 eCite UTAS (University of Tasmania) 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 |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Geophysics Geodesy |
spellingShingle |
Earth Sciences Geophysics Geodesy Rosier, SHR Gudmundsson, GH King, MA Nicholls, KW Makinson, K Corr, HFJ Strong tidal variations in ice flow observed across the entire Ronne Ice Shelf and adjoining ice streams |
topic_facet |
Earth Sciences Geophysics Geodesy |
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 (M sf ) periodicity. Our new data set shows that the M sf 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 M sf 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 M sf 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 M sf 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, SHR Gudmundsson, GH King, MA Nicholls, KW Makinson, K Corr, HFJ |
author_facet |
Rosier, SHR Gudmundsson, GH King, MA Nicholls, KW Makinson, K Corr, HFJ |
author_sort |
Rosier, SHR |
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 GmbH |
publishDate |
2017 |
url |
https://doi.org/10.5194/essd-9-849-2017 http://ecite.utas.edu.au/122667 |
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 |
http://ecite.utas.edu.au/122667/1/essd-9-849-2017.pdf http://dx.doi.org/10.5194/essd-9-849-2017 http://purl.org/au-research/grants/arc/FT110100207 Rosier, SHR and Gudmundsson, GH and King, MA and Nicholls, KW and Makinson, K and Corr, HFJ, Strong tidal variations in ice flow observed across the entire Ronne Ice Shelf and adjoining ice streams, Earth System Science Data, 9 pp. 849-860. ISSN 1866-3508 (2017) [Refereed Article] http://ecite.utas.edu.au/122667 |
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_ |
1766171047983316992 |