Eddy cancellation of the Ekman cell in subtropical gyres
The presence of large-scale Ekman pumping associated with the climatological wind stress curl is the textbook explanation for low biological activity in the subtropical gyres. Using an idealized eddy-resolving model it is shown that Eulerian-mean Ekman pumping may be opposed by an eddy-driven circul...
Published in: | Journal of Physical Oceanography |
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Format: | Article in Journal/Newspaper |
Language: | unknown |
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American Meteorological Society
2016
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Online Access: | https://doi.org/10.1175/JPO-D-16-0097.1 https://ora.ox.ac.uk/objects/uuid:b53bc9b2-c622-46b1-aecf-9ff86411f0f2 |
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ftuloxford:oai:ora.ox.ac.uk:uuid:b53bc9b2-c622-46b1-aecf-9ff86411f0f2 2023-05-15T18:25:14+02:00 Eddy cancellation of the Ekman cell in subtropical gyres Doddridge, E Marshall, D Hogg, A 2016-07-29 https://doi.org/10.1175/JPO-D-16-0097.1 https://ora.ox.ac.uk/objects/uuid:b53bc9b2-c622-46b1-aecf-9ff86411f0f2 unknown American Meteorological Society doi:10.1175/JPO-D-16-0097.1 https://ora.ox.ac.uk/objects/uuid:b53bc9b2-c622-46b1-aecf-9ff86411f0f2 https://doi.org/10.1175/JPO-D-16-0097.1 info:eu-repo/semantics/openAccess CC Attribution (CC BY) CC-BY Journal article 2016 ftuloxford https://doi.org/10.1175/JPO-D-16-0097.1 2022-06-28T20:21:50Z The presence of large-scale Ekman pumping associated with the climatological wind stress curl is the textbook explanation for low biological activity in the subtropical gyres. Using an idealized eddy-resolving model it is shown that Eulerian-mean Ekman pumping may be opposed by an eddy-driven circulation, analogous to the way in which the atmospheric Ferrel cell and the Southern Ocean Deacon cell are opposed by eddy-driven circulations. Lagrangian particle tracking, potential vorticity fluxes, and depth-density streamfunctions are used to show that, in the model, the rectified effect of eddies acts to largely cancel the Eulerian-mean Ekman downwelling. To distinguish this effect from eddy compensation, it is proposed that the suppression of Eulerian-mean downwelling by eddies be called ``eddy cancellation.'' Article in Journal/Newspaper Southern Ocean ORA - Oxford University Research Archive Curl ENVELOPE(-63.071,-63.071,-70.797,-70.797) Deacon ENVELOPE(-59.987,-59.987,-73.248,-73.248) Southern Ocean Journal of Physical Oceanography 46 10 2995 3010 |
institution |
Open Polar |
collection |
ORA - Oxford University Research Archive |
op_collection_id |
ftuloxford |
language |
unknown |
description |
The presence of large-scale Ekman pumping associated with the climatological wind stress curl is the textbook explanation for low biological activity in the subtropical gyres. Using an idealized eddy-resolving model it is shown that Eulerian-mean Ekman pumping may be opposed by an eddy-driven circulation, analogous to the way in which the atmospheric Ferrel cell and the Southern Ocean Deacon cell are opposed by eddy-driven circulations. Lagrangian particle tracking, potential vorticity fluxes, and depth-density streamfunctions are used to show that, in the model, the rectified effect of eddies acts to largely cancel the Eulerian-mean Ekman downwelling. To distinguish this effect from eddy compensation, it is proposed that the suppression of Eulerian-mean downwelling by eddies be called ``eddy cancellation.'' |
format |
Article in Journal/Newspaper |
author |
Doddridge, E Marshall, D Hogg, A |
spellingShingle |
Doddridge, E Marshall, D Hogg, A Eddy cancellation of the Ekman cell in subtropical gyres |
author_facet |
Doddridge, E Marshall, D Hogg, A |
author_sort |
Doddridge, E |
title |
Eddy cancellation of the Ekman cell in subtropical gyres |
title_short |
Eddy cancellation of the Ekman cell in subtropical gyres |
title_full |
Eddy cancellation of the Ekman cell in subtropical gyres |
title_fullStr |
Eddy cancellation of the Ekman cell in subtropical gyres |
title_full_unstemmed |
Eddy cancellation of the Ekman cell in subtropical gyres |
title_sort |
eddy cancellation of the ekman cell in subtropical gyres |
publisher |
American Meteorological Society |
publishDate |
2016 |
url |
https://doi.org/10.1175/JPO-D-16-0097.1 https://ora.ox.ac.uk/objects/uuid:b53bc9b2-c622-46b1-aecf-9ff86411f0f2 |
long_lat |
ENVELOPE(-63.071,-63.071,-70.797,-70.797) ENVELOPE(-59.987,-59.987,-73.248,-73.248) |
geographic |
Curl Deacon Southern Ocean |
geographic_facet |
Curl Deacon Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
doi:10.1175/JPO-D-16-0097.1 https://ora.ox.ac.uk/objects/uuid:b53bc9b2-c622-46b1-aecf-9ff86411f0f2 https://doi.org/10.1175/JPO-D-16-0097.1 |
op_rights |
info:eu-repo/semantics/openAccess CC Attribution (CC BY) |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1175/JPO-D-16-0097.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
46 |
container_issue |
10 |
container_start_page |
2995 |
op_container_end_page |
3010 |
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1766206525219536896 |