Wind stress mediated variability of the Filchner Trough overflow, Weddell Sea
The Filchner Trough (FT) is a key site for exchange of water masses between the Weddell Sea continental shelf and the deep ocean. Cold and dense Ice Shelf Water (ISW), a precursor for Antarctic Bottom Water, flows north along the FT and overflows the Filchner Sill. Although access of warm water to t...
Published in: | Journal of Geophysical Research: Oceans |
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Online Access: | https://hdl.handle.net/1956/20561 https://doi.org/10.1002/2017jc013579 |
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ftunivbergen:oai:bora.uib.no:1956/20561 2023-05-15T14:01:16+02:00 Wind stress mediated variability of the Filchner Trough overflow, Weddell Sea Daae, Kjersti Darelius, Elin Maria K. Fer, Ilker Østerhus, Svein Ryan, S. 2019-01-24T09:03:58Z application/pdf https://hdl.handle.net/1956/20561 https://doi.org/10.1002/2017jc013579 eng eng American Geophysical Union Norges forskningsråd: 211415 Norges forskningsråd: 231549 urn:issn:0148-0227 urn:issn:2156-2202 https://hdl.handle.net/1956/20561 https://doi.org/10.1002/2017jc013579 cristin:1581715 Attribution-Non Commercial-No Derivatives CC BY-NC-ND http://creativecommons.org/licenses/by-nc-nd/4.0/ Copyright 2018 The Authors Journal of Geophysical Research VDP::Matematikk og naturvitenskap: 400::Geofag: 450::Oseanografi: 452 VDP::Mathematics and natural scienses: 400::Geosciences: 450::Oceanography: 452 Peer reviewed Journal article 2019 ftunivbergen https://doi.org/10.1002/2017jc013579 2023-03-14T17:40:46Z The Filchner Trough (FT) is a key site for exchange of water masses between the Weddell Sea continental shelf and the deep ocean. Cold and dense Ice Shelf Water (ISW), a precursor for Antarctic Bottom Water, flows north along the FT and overflows the Filchner Sill. Although access of warm water to the Weddell Sea continental shelf is limited due to the presence of the Antarctic Slope Front, southward transport of warm water is facilitated through the FT. We use moored current meters from the Filchner Sill region to show that the monthly scale variability of the ISW overflow is connected to the variability of the alongslope wind stress upstream. Periods with significant correlation between the wind and ISW overflow are characterized by (I) wind directed along the continental slope, (II) high ISW overflow speed, and (III) high variability in the 16–64 day period band for wind and current. We propose that a recirculation of the slope current, associated with the Antarctic Slope Front, may occur in the FT during periods of strong wind forcing, and that such recirculation could explain the correlation between the wind stress and the ISW overflow. We further show that an increased wind stress along the continental slope leads to increased current speed within the slope current and the Antarctic Coastal Current, with possible implications for the on-shore heat transport. publishedVersion Article in Journal/Newspaper Antarc* Antarctic Ice Shelf Weddell Sea University of Bergen: Bergen Open Research Archive (BORA-UiB) Antarctic Filchner Trough ENVELOPE(-36.000,-36.000,-77.000,-77.000) The Antarctic Weddell Weddell Sea Journal of Geophysical Research: Oceans 123 5 3186 3203 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
VDP::Matematikk og naturvitenskap: 400::Geofag: 450::Oseanografi: 452 VDP::Mathematics and natural scienses: 400::Geosciences: 450::Oceanography: 452 |
spellingShingle |
VDP::Matematikk og naturvitenskap: 400::Geofag: 450::Oseanografi: 452 VDP::Mathematics and natural scienses: 400::Geosciences: 450::Oceanography: 452 Daae, Kjersti Darelius, Elin Maria K. Fer, Ilker Østerhus, Svein Ryan, S. Wind stress mediated variability of the Filchner Trough overflow, Weddell Sea |
topic_facet |
VDP::Matematikk og naturvitenskap: 400::Geofag: 450::Oseanografi: 452 VDP::Mathematics and natural scienses: 400::Geosciences: 450::Oceanography: 452 |
description |
The Filchner Trough (FT) is a key site for exchange of water masses between the Weddell Sea continental shelf and the deep ocean. Cold and dense Ice Shelf Water (ISW), a precursor for Antarctic Bottom Water, flows north along the FT and overflows the Filchner Sill. Although access of warm water to the Weddell Sea continental shelf is limited due to the presence of the Antarctic Slope Front, southward transport of warm water is facilitated through the FT. We use moored current meters from the Filchner Sill region to show that the monthly scale variability of the ISW overflow is connected to the variability of the alongslope wind stress upstream. Periods with significant correlation between the wind and ISW overflow are characterized by (I) wind directed along the continental slope, (II) high ISW overflow speed, and (III) high variability in the 16–64 day period band for wind and current. We propose that a recirculation of the slope current, associated with the Antarctic Slope Front, may occur in the FT during periods of strong wind forcing, and that such recirculation could explain the correlation between the wind stress and the ISW overflow. We further show that an increased wind stress along the continental slope leads to increased current speed within the slope current and the Antarctic Coastal Current, with possible implications for the on-shore heat transport. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Daae, Kjersti Darelius, Elin Maria K. Fer, Ilker Østerhus, Svein Ryan, S. |
author_facet |
Daae, Kjersti Darelius, Elin Maria K. Fer, Ilker Østerhus, Svein Ryan, S. |
author_sort |
Daae, Kjersti |
title |
Wind stress mediated variability of the Filchner Trough overflow, Weddell Sea |
title_short |
Wind stress mediated variability of the Filchner Trough overflow, Weddell Sea |
title_full |
Wind stress mediated variability of the Filchner Trough overflow, Weddell Sea |
title_fullStr |
Wind stress mediated variability of the Filchner Trough overflow, Weddell Sea |
title_full_unstemmed |
Wind stress mediated variability of the Filchner Trough overflow, Weddell Sea |
title_sort |
wind stress mediated variability of the filchner trough overflow, weddell sea |
publisher |
American Geophysical Union |
publishDate |
2019 |
url |
https://hdl.handle.net/1956/20561 https://doi.org/10.1002/2017jc013579 |
long_lat |
ENVELOPE(-36.000,-36.000,-77.000,-77.000) |
geographic |
Antarctic Filchner Trough The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic Filchner Trough The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Ice Shelf Weddell Sea |
genre_facet |
Antarc* Antarctic Ice Shelf Weddell Sea |
op_source |
Journal of Geophysical Research |
op_relation |
Norges forskningsråd: 211415 Norges forskningsråd: 231549 urn:issn:0148-0227 urn:issn:2156-2202 https://hdl.handle.net/1956/20561 https://doi.org/10.1002/2017jc013579 cristin:1581715 |
op_rights |
Attribution-Non Commercial-No Derivatives CC BY-NC-ND http://creativecommons.org/licenses/by-nc-nd/4.0/ Copyright 2018 The Authors |
op_doi |
https://doi.org/10.1002/2017jc013579 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
123 |
container_issue |
5 |
container_start_page |
3186 |
op_container_end_page |
3203 |
_version_ |
1766270871258791936 |