Modeling tidal currents beneath Filchner-Ronne Ice Shelf and on the adjacent continental shelf: Their effect on mixing and transport
A depth-averaged tidal model has been applied to the southern Weddell Sea. The model domain covers the southern continental shelf, including the ocean cavity beneath Filchner-Ronne Ice Shelf. Reasonable agreement with the available current meter data has been achieved. Our results confirm that in ar...
Published in: | Journal of Geophysical Research: Oceans |
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American Geophysical Union
1999
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Online Access: | http://nora.nerc.ac.uk/id/eprint/503583/ https://doi.org/10.1029/1999JC900008 |
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ftnerc:oai:nora.nerc.ac.uk:503583 2023-05-15T15:44:19+02:00 Modeling tidal currents beneath Filchner-Ronne Ice Shelf and on the adjacent continental shelf: Their effect on mixing and transport Makinson, Keith Nicholls, Keith W. 1999 http://nora.nerc.ac.uk/id/eprint/503583/ https://doi.org/10.1029/1999JC900008 unknown American Geophysical Union Makinson, Keith orcid:0000-0002-5791-1767 Nicholls, Keith W. orcid:0000-0002-2188-4509 . 1999 Modeling tidal currents beneath Filchner-Ronne Ice Shelf and on the adjacent continental shelf: Their effect on mixing and transport. Journal of Geophysical Research, 104 (C6). 13449-13465. https://doi.org/10.1029/1999JC900008 <https://doi.org/10.1029/1999JC900008> Publication - Article PeerReviewed 1999 ftnerc https://doi.org/10.1029/1999JC900008 2023-02-04T19:37:54Z A depth-averaged tidal model has been applied to the southern Weddell Sea. The model domain covers the southern continental shelf, including the ocean cavity beneath Filchner-Ronne Ice Shelf. Reasonable agreement with the available current meter data has been achieved. Our results confirm that in areas with shallow water and large topographic gradients, tidal oscillations with peak velocities up to 1 m s−1 play a significant role in the vertical mixing and transport of water masses. The estimated energy dissipation beneath Filchner-Ronne Ice Shelf due to surface friction is 25 GW, approximately 1% of the world's total tidal dissipation. Tidally induced Lagrangian residual currents converging at the ice front, an area of strong mixing, draw together water masses from the continental shelf and sub-ice shelf cavity. The model indicates that Lagrangian residual currents have fluxes of up to 250,000 m3 s−1, and speeds of over 5 cm s−1 along the ice front, with over 350,000 m3 s−1 being exchanged between the sub-ice shelf cavity and adjacent continental shelf. These currents are particularly efficient in ventilating the sub-ice shelf cavity within 150 km of Ronne Ice Front. Such strong tidal mixing will significantly modify the properties of water masses that flow through this region, particularly to the west of Berkner Island. The model predictions indicate that tidal processes strongly influence the oceanographic conditions in the vicinity of Ronne Ice Front. Shipborne observations along the ice front support many of the model predictions concerning the effect of tides on the hydrography. Article in Journal/Newspaper Berkner Island Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ronne Ice Shelf Weddell Sea Natural Environment Research Council: NERC Open Research Archive Weddell Sea Weddell Ronne Ice Shelf ENVELOPE(-61.000,-61.000,-78.500,-78.500) Berkner Island ENVELOPE(-48.117,-48.117,-79.333,-79.333) Ronne Ice Front ENVELOPE(-55.000,-55.000,-76.000,-76.000) Journal of Geophysical Research: Oceans 104 C6 13449 13465 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
description |
A depth-averaged tidal model has been applied to the southern Weddell Sea. The model domain covers the southern continental shelf, including the ocean cavity beneath Filchner-Ronne Ice Shelf. Reasonable agreement with the available current meter data has been achieved. Our results confirm that in areas with shallow water and large topographic gradients, tidal oscillations with peak velocities up to 1 m s−1 play a significant role in the vertical mixing and transport of water masses. The estimated energy dissipation beneath Filchner-Ronne Ice Shelf due to surface friction is 25 GW, approximately 1% of the world's total tidal dissipation. Tidally induced Lagrangian residual currents converging at the ice front, an area of strong mixing, draw together water masses from the continental shelf and sub-ice shelf cavity. The model indicates that Lagrangian residual currents have fluxes of up to 250,000 m3 s−1, and speeds of over 5 cm s−1 along the ice front, with over 350,000 m3 s−1 being exchanged between the sub-ice shelf cavity and adjacent continental shelf. These currents are particularly efficient in ventilating the sub-ice shelf cavity within 150 km of Ronne Ice Front. Such strong tidal mixing will significantly modify the properties of water masses that flow through this region, particularly to the west of Berkner Island. The model predictions indicate that tidal processes strongly influence the oceanographic conditions in the vicinity of Ronne Ice Front. Shipborne observations along the ice front support many of the model predictions concerning the effect of tides on the hydrography. |
format |
Article in Journal/Newspaper |
author |
Makinson, Keith Nicholls, Keith W. |
spellingShingle |
Makinson, Keith Nicholls, Keith W. Modeling tidal currents beneath Filchner-Ronne Ice Shelf and on the adjacent continental shelf: Their effect on mixing and transport |
author_facet |
Makinson, Keith Nicholls, Keith W. |
author_sort |
Makinson, Keith |
title |
Modeling tidal currents beneath Filchner-Ronne Ice Shelf and on the adjacent continental shelf: Their effect on mixing and transport |
title_short |
Modeling tidal currents beneath Filchner-Ronne Ice Shelf and on the adjacent continental shelf: Their effect on mixing and transport |
title_full |
Modeling tidal currents beneath Filchner-Ronne Ice Shelf and on the adjacent continental shelf: Their effect on mixing and transport |
title_fullStr |
Modeling tidal currents beneath Filchner-Ronne Ice Shelf and on the adjacent continental shelf: Their effect on mixing and transport |
title_full_unstemmed |
Modeling tidal currents beneath Filchner-Ronne Ice Shelf and on the adjacent continental shelf: Their effect on mixing and transport |
title_sort |
modeling tidal currents beneath filchner-ronne ice shelf and on the adjacent continental shelf: their effect on mixing and transport |
publisher |
American Geophysical Union |
publishDate |
1999 |
url |
http://nora.nerc.ac.uk/id/eprint/503583/ https://doi.org/10.1029/1999JC900008 |
long_lat |
ENVELOPE(-61.000,-61.000,-78.500,-78.500) ENVELOPE(-48.117,-48.117,-79.333,-79.333) ENVELOPE(-55.000,-55.000,-76.000,-76.000) |
geographic |
Weddell Sea Weddell Ronne Ice Shelf Berkner Island Ronne Ice Front |
geographic_facet |
Weddell Sea Weddell Ronne Ice Shelf Berkner Island Ronne Ice Front |
genre |
Berkner Island Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ronne Ice Shelf Weddell Sea |
genre_facet |
Berkner Island Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ronne Ice Shelf Weddell Sea |
op_relation |
Makinson, Keith orcid:0000-0002-5791-1767 Nicholls, Keith W. orcid:0000-0002-2188-4509 . 1999 Modeling tidal currents beneath Filchner-Ronne Ice Shelf and on the adjacent continental shelf: Their effect on mixing and transport. Journal of Geophysical Research, 104 (C6). 13449-13465. https://doi.org/10.1029/1999JC900008 <https://doi.org/10.1029/1999JC900008> |
op_doi |
https://doi.org/10.1029/1999JC900008 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
104 |
container_issue |
C6 |
container_start_page |
13449 |
op_container_end_page |
13465 |
_version_ |
1766378616977883136 |