The subtropical Deacon cells
International audience The circulation of the subtropical gyres can be decomposed into a horizontal recirculation along contours of constant Bernoulli potential and an overturning circulation across these contours. While the geometry and topology of Bernoulli contours is more complicated in the subt...
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ftinsu:oai:HAL:hal-00298400v1 2023-11-12T04:26:34+01:00 The subtropical Deacon cells Polton, J. A. Marshall, D. P. Department of Meteorology 2006-07-21 https://hal.science/hal-00298400 https://hal.science/hal-00298400/document https://hal.science/hal-00298400/file/osd-3-867-2006.pdf en eng HAL CCSD European Geosciences Union hal-00298400 https://hal.science/hal-00298400 https://hal.science/hal-00298400/document https://hal.science/hal-00298400/file/osd-3-867-2006.pdf info:eu-repo/semantics/OpenAccess ISSN: 1812-0806 EISSN: 1812-0822 Ocean Science Discussions https://hal.science/hal-00298400 Ocean Science Discussions, 2006, 3 (4), pp.867-901 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2006 ftinsu 2023-10-25T16:28:01Z International audience The circulation of the subtropical gyres can be decomposed into a horizontal recirculation along contours of constant Bernoulli potential and an overturning circulation across these contours. While the geometry and topology of Bernoulli contours is more complicated in the subtropical gyres than in the Southern Ocean, these subtropical overturning circulations are very much analogous to the Deacon cell found in the Southern Ocean. This analogy is formalised through an exact integral constraint, including the rectified effects of transient eddies. The constraint can be interpreted either in terms of vertical fluxes of potential vorticity, or equivalently as an integral buoyancy budget for an imaginary fluid parcel recirculating around a closed Bernoulli contour. Under conditions of vanishing buoyancy and mechanical forcing, the constraint reduces to a generalised non-acceleration condition, under which the Eulerian-mean and eddy-induced overturning circulations exactly compensate. The terms in the integral constraint are diagnosed in an eddy-permitting ocean model in both the North Pacific subtropical gyre and the Southern Ocean. The extent to which the Eulerian-mean and eddy-induced overturning circulations compensate is discussed in each case. Article in Journal/Newspaper Southern Ocean Institut national des sciences de l'Univers: HAL-INSU Southern Ocean Pacific Deacon ENVELOPE(-59.987,-59.987,-73.248,-73.248) |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
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[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Polton, J. A. Marshall, D. P. The subtropical Deacon cells |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience The circulation of the subtropical gyres can be decomposed into a horizontal recirculation along contours of constant Bernoulli potential and an overturning circulation across these contours. While the geometry and topology of Bernoulli contours is more complicated in the subtropical gyres than in the Southern Ocean, these subtropical overturning circulations are very much analogous to the Deacon cell found in the Southern Ocean. This analogy is formalised through an exact integral constraint, including the rectified effects of transient eddies. The constraint can be interpreted either in terms of vertical fluxes of potential vorticity, or equivalently as an integral buoyancy budget for an imaginary fluid parcel recirculating around a closed Bernoulli contour. Under conditions of vanishing buoyancy and mechanical forcing, the constraint reduces to a generalised non-acceleration condition, under which the Eulerian-mean and eddy-induced overturning circulations exactly compensate. The terms in the integral constraint are diagnosed in an eddy-permitting ocean model in both the North Pacific subtropical gyre and the Southern Ocean. The extent to which the Eulerian-mean and eddy-induced overturning circulations compensate is discussed in each case. |
author2 |
Department of Meteorology |
format |
Article in Journal/Newspaper |
author |
Polton, J. A. Marshall, D. P. |
author_facet |
Polton, J. A. Marshall, D. P. |
author_sort |
Polton, J. A. |
title |
The subtropical Deacon cells |
title_short |
The subtropical Deacon cells |
title_full |
The subtropical Deacon cells |
title_fullStr |
The subtropical Deacon cells |
title_full_unstemmed |
The subtropical Deacon cells |
title_sort |
subtropical deacon cells |
publisher |
HAL CCSD |
publishDate |
2006 |
url |
https://hal.science/hal-00298400 https://hal.science/hal-00298400/document https://hal.science/hal-00298400/file/osd-3-867-2006.pdf |
long_lat |
ENVELOPE(-59.987,-59.987,-73.248,-73.248) |
geographic |
Southern Ocean Pacific Deacon |
geographic_facet |
Southern Ocean Pacific Deacon |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
ISSN: 1812-0806 EISSN: 1812-0822 Ocean Science Discussions https://hal.science/hal-00298400 Ocean Science Discussions, 2006, 3 (4), pp.867-901 |
op_relation |
hal-00298400 https://hal.science/hal-00298400 https://hal.science/hal-00298400/document https://hal.science/hal-00298400/file/osd-3-867-2006.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782340496990928896 |