A microscale view of mixing and overturning across the Antarctic Circumpolar Current
The relative roles of isoneutral stirring by mesoscale eddies and dianeutral stirring by small-scale turbulence in setting the large-scale temperature–salinity relation of the Southern Ocean against the action of the overturning circulation are assessed by analyzing a set of shear and temperature mi...
Published in: | Journal of Physical Oceanography |
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ftsouthampton:oai:eprints.soton.ac.uk:390050 2023-07-30T03:57:16+02:00 A microscale view of mixing and overturning across the Antarctic Circumpolar Current Naveira Garabato, Alberto C. Polzin, Kurt L. Ferrari, Raffaele Zika, Jan D. Forryan, Alexander 2016-01 text https://eprints.soton.ac.uk/390050/ https://eprints.soton.ac.uk/390050/1/jpo-d-15-0025%25252E1.pdf en English eng https://eprints.soton.ac.uk/390050/1/jpo-d-15-0025%25252E1.pdf Naveira Garabato, Alberto C., Polzin, Kurt L., Ferrari, Raffaele, Zika, Jan D. and Forryan, Alexander (2016) A microscale view of mixing and overturning across the Antarctic Circumpolar Current. Journal of Physical Oceanography, 46 (1), 233-254. (doi:10.1175/JPO-D-15-0025.1 <http://dx.doi.org/10.1175/JPO-D-15-0025.1>). Article PeerReviewed 2016 ftsouthampton https://doi.org/10.1175/JPO-D-15-0025.1 2023-07-09T22:05:24Z The relative roles of isoneutral stirring by mesoscale eddies and dianeutral stirring by small-scale turbulence in setting the large-scale temperature–salinity relation of the Southern Ocean against the action of the overturning circulation are assessed by analyzing a set of shear and temperature microstructure measurements across Drake Passage in a “triple decomposition” framework. It is shown that a picture of mixing and overturning across a region of the Antarctic Circumpolar Current (ACC) may be constructed from a relatively modest number of microstructure profiles. The rates of isoneutral and dianeutral stirring are found to exhibit distinct, characteristic, and abrupt variations: most notably, a one to two orders of magnitude suppression of isoneutral stirring in the upper kilometer of the ACC frontal jets and an order of magnitude intensification of dianeutral stirring in the subpycnocline and deepest layers of the ACC. These variations balance an overturning circulation with meridional flows of O(1) mm s?1 across the ACC’s mean thermohaline structure. Isoneutral and dianeutral stirring play complementary roles in balancing the overturning, with isoneutral processes dominating in intermediate waters and the Upper Circumpolar Deep Water and dianeutral processes prevailing in lighter and denser layers. Article in Journal/Newspaper Antarc* Antarctic Drake Passage Southern Ocean University of Southampton: e-Prints Soton Antarctic Drake Passage Southern Ocean The Antarctic Journal of Physical Oceanography 46 1 233 254 |
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University of Southampton: e-Prints Soton |
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ftsouthampton |
language |
English |
description |
The relative roles of isoneutral stirring by mesoscale eddies and dianeutral stirring by small-scale turbulence in setting the large-scale temperature–salinity relation of the Southern Ocean against the action of the overturning circulation are assessed by analyzing a set of shear and temperature microstructure measurements across Drake Passage in a “triple decomposition” framework. It is shown that a picture of mixing and overturning across a region of the Antarctic Circumpolar Current (ACC) may be constructed from a relatively modest number of microstructure profiles. The rates of isoneutral and dianeutral stirring are found to exhibit distinct, characteristic, and abrupt variations: most notably, a one to two orders of magnitude suppression of isoneutral stirring in the upper kilometer of the ACC frontal jets and an order of magnitude intensification of dianeutral stirring in the subpycnocline and deepest layers of the ACC. These variations balance an overturning circulation with meridional flows of O(1) mm s?1 across the ACC’s mean thermohaline structure. Isoneutral and dianeutral stirring play complementary roles in balancing the overturning, with isoneutral processes dominating in intermediate waters and the Upper Circumpolar Deep Water and dianeutral processes prevailing in lighter and denser layers. |
format |
Article in Journal/Newspaper |
author |
Naveira Garabato, Alberto C. Polzin, Kurt L. Ferrari, Raffaele Zika, Jan D. Forryan, Alexander |
spellingShingle |
Naveira Garabato, Alberto C. Polzin, Kurt L. Ferrari, Raffaele Zika, Jan D. Forryan, Alexander A microscale view of mixing and overturning across the Antarctic Circumpolar Current |
author_facet |
Naveira Garabato, Alberto C. Polzin, Kurt L. Ferrari, Raffaele Zika, Jan D. Forryan, Alexander |
author_sort |
Naveira Garabato, Alberto C. |
title |
A microscale view of mixing and overturning across the Antarctic Circumpolar Current |
title_short |
A microscale view of mixing and overturning across the Antarctic Circumpolar Current |
title_full |
A microscale view of mixing and overturning across the Antarctic Circumpolar Current |
title_fullStr |
A microscale view of mixing and overturning across the Antarctic Circumpolar Current |
title_full_unstemmed |
A microscale view of mixing and overturning across the Antarctic Circumpolar Current |
title_sort |
microscale view of mixing and overturning across the antarctic circumpolar current |
publishDate |
2016 |
url |
https://eprints.soton.ac.uk/390050/ https://eprints.soton.ac.uk/390050/1/jpo-d-15-0025%25252E1.pdf |
geographic |
Antarctic Drake Passage Southern Ocean The Antarctic |
geographic_facet |
Antarctic Drake Passage Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Drake Passage Southern Ocean |
genre_facet |
Antarc* Antarctic Drake Passage Southern Ocean |
op_relation |
https://eprints.soton.ac.uk/390050/1/jpo-d-15-0025%25252E1.pdf Naveira Garabato, Alberto C., Polzin, Kurt L., Ferrari, Raffaele, Zika, Jan D. and Forryan, Alexander (2016) A microscale view of mixing and overturning across the Antarctic Circumpolar Current. Journal of Physical Oceanography, 46 (1), 233-254. (doi:10.1175/JPO-D-15-0025.1 <http://dx.doi.org/10.1175/JPO-D-15-0025.1>). |
op_doi |
https://doi.org/10.1175/JPO-D-15-0025.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
46 |
container_issue |
1 |
container_start_page |
233 |
op_container_end_page |
254 |
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1772816558307934208 |