Acceleration of the Antarctic Circumpolar Current by Wind Stress along the Coast of Antarctica
The influence of wind forcing on variability of the Antarctic Circumpolar Current (ACC) is investigated using a series of eddy-permitting ocean–sea ice models. At interannual and decadal time scales the ACC transport is sensitive to both the mean strength of westerly winds along the ACC circumpolar...
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2013
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ftnerc:oai:nora.nerc.ac.uk:504489 2023-05-15T13:48:08+02:00 Acceleration of the Antarctic Circumpolar Current by Wind Stress along the Coast of Antarctica Zika, Jan D. Le Sommer, Julien Dufour, Carolina O. Naveira-Garabato, Alberto Blaker, Adam 2013-12 text http://nora.nerc.ac.uk/id/eprint/504489/ https://nora.nerc.ac.uk/id/eprint/504489/1/jpo-d-13-091%252E1-Zika-2013.pdf https://doi.org/10.1175/JPO-D-13-091.1 en eng https://nora.nerc.ac.uk/id/eprint/504489/1/jpo-d-13-091%252E1-Zika-2013.pdf Zika, Jan D.; Le Sommer, Julien; Dufour, Carolina O.; Naveira-Garabato, Alberto; Blaker, Adam orcid:0000-0001-5454-0131 . 2013 Acceleration of the Antarctic Circumpolar Current by Wind Stress along the Coast of Antarctica. Journal of Physical Oceanography, 43 (12). 2772-2784. https://doi.org/10.1175/JPO-D-13-091.1 <https://doi.org/10.1175/JPO-D-13-091.1> Publication - Article PeerReviewed 2013 ftnerc https://doi.org/10.1175/JPO-D-13-091.1 2023-02-04T19:38:27Z The influence of wind forcing on variability of the Antarctic Circumpolar Current (ACC) is investigated using a series of eddy-permitting ocean–sea ice models. At interannual and decadal time scales the ACC transport is sensitive to both the mean strength of westerly winds along the ACC circumpolar path, consistent with zonal momentum balance theories, and sensitive to the wind stresses along the coast of Antarctica, consistent with the “free mode” theory of Hughes et al. A linear combination of the two factors explains differences in ACC transport across 11 regional quasi-equilibrium experiments. Repeated single-year global experiments show that the ACC can be robustly accelerated by both processes. Across an ensemble of simulations with realistic forcing over the second half of the twentieth century, interannual ACC transport variability owing to the free-mode mechanism exceeds that due to the zonal momentum balance mechanism by a factor of between 3.5 and 5 to one. While the ACC transport may not accelerate significantly owing to projected increases in along-ACC winds in future decades, significant changes in transport could still occur because of changes in the stress along the coast of Antarctica. Article in Journal/Newspaper Antarc* Antarctic Antarctica Antarctica Journal Sea ice Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Journal of Physical Oceanography 43 12 2772 2784 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
The influence of wind forcing on variability of the Antarctic Circumpolar Current (ACC) is investigated using a series of eddy-permitting ocean–sea ice models. At interannual and decadal time scales the ACC transport is sensitive to both the mean strength of westerly winds along the ACC circumpolar path, consistent with zonal momentum balance theories, and sensitive to the wind stresses along the coast of Antarctica, consistent with the “free mode” theory of Hughes et al. A linear combination of the two factors explains differences in ACC transport across 11 regional quasi-equilibrium experiments. Repeated single-year global experiments show that the ACC can be robustly accelerated by both processes. Across an ensemble of simulations with realistic forcing over the second half of the twentieth century, interannual ACC transport variability owing to the free-mode mechanism exceeds that due to the zonal momentum balance mechanism by a factor of between 3.5 and 5 to one. While the ACC transport may not accelerate significantly owing to projected increases in along-ACC winds in future decades, significant changes in transport could still occur because of changes in the stress along the coast of Antarctica. |
format |
Article in Journal/Newspaper |
author |
Zika, Jan D. Le Sommer, Julien Dufour, Carolina O. Naveira-Garabato, Alberto Blaker, Adam |
spellingShingle |
Zika, Jan D. Le Sommer, Julien Dufour, Carolina O. Naveira-Garabato, Alberto Blaker, Adam Acceleration of the Antarctic Circumpolar Current by Wind Stress along the Coast of Antarctica |
author_facet |
Zika, Jan D. Le Sommer, Julien Dufour, Carolina O. Naveira-Garabato, Alberto Blaker, Adam |
author_sort |
Zika, Jan D. |
title |
Acceleration of the Antarctic Circumpolar Current by Wind Stress along the Coast of Antarctica |
title_short |
Acceleration of the Antarctic Circumpolar Current by Wind Stress along the Coast of Antarctica |
title_full |
Acceleration of the Antarctic Circumpolar Current by Wind Stress along the Coast of Antarctica |
title_fullStr |
Acceleration of the Antarctic Circumpolar Current by Wind Stress along the Coast of Antarctica |
title_full_unstemmed |
Acceleration of the Antarctic Circumpolar Current by Wind Stress along the Coast of Antarctica |
title_sort |
acceleration of the antarctic circumpolar current by wind stress along the coast of antarctica |
publishDate |
2013 |
url |
http://nora.nerc.ac.uk/id/eprint/504489/ https://nora.nerc.ac.uk/id/eprint/504489/1/jpo-d-13-091%252E1-Zika-2013.pdf https://doi.org/10.1175/JPO-D-13-091.1 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctica Antarctica Journal Sea ice |
genre_facet |
Antarc* Antarctic Antarctica Antarctica Journal Sea ice |
op_relation |
https://nora.nerc.ac.uk/id/eprint/504489/1/jpo-d-13-091%252E1-Zika-2013.pdf Zika, Jan D.; Le Sommer, Julien; Dufour, Carolina O.; Naveira-Garabato, Alberto; Blaker, Adam orcid:0000-0001-5454-0131 . 2013 Acceleration of the Antarctic Circumpolar Current by Wind Stress along the Coast of Antarctica. Journal of Physical Oceanography, 43 (12). 2772-2784. https://doi.org/10.1175/JPO-D-13-091.1 <https://doi.org/10.1175/JPO-D-13-091.1> |
op_doi |
https://doi.org/10.1175/JPO-D-13-091.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
43 |
container_issue |
12 |
container_start_page |
2772 |
op_container_end_page |
2784 |
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1766248735049777152 |