Forcing of the overturning circulation across a circumpolar channel by internal wave breaking
The hypothesis that the impingement of mesoscale eddy flows on small-scale topography regulates diapycnal mixing and meridional overturning across the deep Southern Ocean is assessed in an idealised model. The model simulates an eddying circumpolar current coupled to a double-celled meridional overt...
Published in: | Journal of Geophysical Research: Oceans |
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Language: | English |
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2016
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ftsouthampton:oai:eprints.soton.ac.uk:397467 2023-08-27T04:12:10+02:00 Forcing of the overturning circulation across a circumpolar channel by internal wave breaking Broadbridge, Maria B. Naveira Garabato, Alberto Nurser, A.J. George 2016-08-05 text https://eprints.soton.ac.uk/397467/ https://eprints.soton.ac.uk/397467/1/jgrc21824.pdf https://eprints.soton.ac.uk/397467/2/jgrc21824.pdf en English eng https://eprints.soton.ac.uk/397467/1/jgrc21824.pdf https://eprints.soton.ac.uk/397467/2/jgrc21824.pdf Broadbridge, Maria B., Naveira Garabato, Alberto and Nurser, A.J. George (2016) Forcing of the overturning circulation across a circumpolar channel by internal wave breaking. Journal of Geophysical Research: Oceans, 121 (8), 5436-5451. (doi:10.1002/2015JC011597 <http://dx.doi.org/10.1002/2015JC011597>). accepted_manuscript cc_by_4 Article PeerReviewed 2016 ftsouthampton https://doi.org/10.1002/2015JC011597 2023-08-03T22:21:46Z The hypothesis that the impingement of mesoscale eddy flows on small-scale topography regulates diapycnal mixing and meridional overturning across the deep Southern Ocean is assessed in an idealised model. The model simulates an eddying circumpolar current coupled to a double-celled meridional overturning with properties broadly resembling those of the Southern Ocean circulation, and represents lee wave-induced diapycnal mixing using an online formulation grounded on wave radiation theory. The diapycnal mixing generated by the simulated eddy field is found to play a major role in sustaining the lower overturning cell in the model, and to underpin a significant sensitivity of this cell to wind forcing. The vertical structure of lower overturning is set by mesoscale eddies, which propagate the effects of near-bottom diapycnal mixing by displacing isopycnals vertically. Article in Journal/Newspaper Southern Ocean University of Southampton: e-Prints Soton Southern Ocean Journal of Geophysical Research: Oceans 121 8 5436 5451 |
institution |
Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
description |
The hypothesis that the impingement of mesoscale eddy flows on small-scale topography regulates diapycnal mixing and meridional overturning across the deep Southern Ocean is assessed in an idealised model. The model simulates an eddying circumpolar current coupled to a double-celled meridional overturning with properties broadly resembling those of the Southern Ocean circulation, and represents lee wave-induced diapycnal mixing using an online formulation grounded on wave radiation theory. The diapycnal mixing generated by the simulated eddy field is found to play a major role in sustaining the lower overturning cell in the model, and to underpin a significant sensitivity of this cell to wind forcing. The vertical structure of lower overturning is set by mesoscale eddies, which propagate the effects of near-bottom diapycnal mixing by displacing isopycnals vertically. |
format |
Article in Journal/Newspaper |
author |
Broadbridge, Maria B. Naveira Garabato, Alberto Nurser, A.J. George |
spellingShingle |
Broadbridge, Maria B. Naveira Garabato, Alberto Nurser, A.J. George Forcing of the overturning circulation across a circumpolar channel by internal wave breaking |
author_facet |
Broadbridge, Maria B. Naveira Garabato, Alberto Nurser, A.J. George |
author_sort |
Broadbridge, Maria B. |
title |
Forcing of the overturning circulation across a circumpolar channel by internal wave breaking |
title_short |
Forcing of the overturning circulation across a circumpolar channel by internal wave breaking |
title_full |
Forcing of the overturning circulation across a circumpolar channel by internal wave breaking |
title_fullStr |
Forcing of the overturning circulation across a circumpolar channel by internal wave breaking |
title_full_unstemmed |
Forcing of the overturning circulation across a circumpolar channel by internal wave breaking |
title_sort |
forcing of the overturning circulation across a circumpolar channel by internal wave breaking |
publishDate |
2016 |
url |
https://eprints.soton.ac.uk/397467/ https://eprints.soton.ac.uk/397467/1/jgrc21824.pdf https://eprints.soton.ac.uk/397467/2/jgrc21824.pdf |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
https://eprints.soton.ac.uk/397467/1/jgrc21824.pdf https://eprints.soton.ac.uk/397467/2/jgrc21824.pdf Broadbridge, Maria B., Naveira Garabato, Alberto and Nurser, A.J. George (2016) Forcing of the overturning circulation across a circumpolar channel by internal wave breaking. Journal of Geophysical Research: Oceans, 121 (8), 5436-5451. (doi:10.1002/2015JC011597 <http://dx.doi.org/10.1002/2015JC011597>). |
op_rights |
accepted_manuscript cc_by_4 |
op_doi |
https://doi.org/10.1002/2015JC011597 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
121 |
container_issue |
8 |
container_start_page |
5436 |
op_container_end_page |
5451 |
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1775356012939706368 |