The residual circulation of the Southern Ocean: which spatio-temporal scales are needed?
The Southern Ocean circulation consists of a complicated mixture of processes and phenomena that arise at different time and spatial scales which need to be parametrized in the state-of-the-art climate models. The temporal and spatial scales that give rise to the present-day residual mean circulatio...
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ftunivreading:oai:centaur.reading.ac.uk:34252 2024-06-23T07:47:04+00:00 The residual circulation of the Southern Ocean: which spatio-temporal scales are needed? Ballarotta, Maxime Drijfhout, Sybren Kuhlbrodt, Till Döös, Kristofer 2013 https://centaur.reading.ac.uk/34252/ unknown Elsevier Ballarotta, M., Drijfhout, S., Kuhlbrodt, T. <https://centaur.reading.ac.uk/view/creators/90000754.html> orcid:0000-0003-2328-6729 and Döös, K. (2013) The residual circulation of the Southern Ocean: which spatio-temporal scales are needed? Ocean Modelling, 64. pp. 46-55. ISSN 1463-5003 doi: https://doi.org/10.1016/j.ocemod.2013.01.005 <https://doi.org/10.1016/j.ocemod.2013.01.005> Article PeerReviewed 2013 ftunivreading 2024-06-11T15:01:09Z The Southern Ocean circulation consists of a complicated mixture of processes and phenomena that arise at different time and spatial scales which need to be parametrized in the state-of-the-art climate models. The temporal and spatial scales that give rise to the present-day residual mean circulation are here investigated by calculating the Meridional Overturning Circulation (MOC) in density coordinates from an eddy-permitting global model. The region sensitive to the temporal decomposition is located between 38°S and 63°S, associated with the eddy-induced transport. The ‘‘Bolus’’ component of the residual circulation corresponds to the eddy-induced transport. It is dominated by timescales between 1 month and 1 year. The temporal behavior of the transient eddies is examined in splitting the ‘‘Bolus’’ component into a ‘‘Seasonal’’, an ‘‘Eddy’’ and an ‘‘Inter-monthly’’ component, respectively representing the correlation between density and velocity fluctuations due to the average seasonal cycle, due to mesoscale eddies and due to large-scale motion on timescales longer than one month that is not due to the seasonal cycle. The ‘‘Seasonal’’ bolus cell is important at all latitudes near the surface. The ‘‘Eddy’’ bolus cell is dominant in the thermocline between 50°S and 35°S and over the whole ocean depth at the latitude of the Drake Passage. The ‘‘Inter-monthly’’ bolus cell is important in all density classes and is maximal in the Brazil–Malvinas Confluence and the Agulhas Return Current. The spatial decomposition indicates that a large part of the Eulerian mean circulation is recovered for spatial scales larger than 11.25°, implying that small-scale meanders in the Antarctic Circumpolar Current (ACC), near the Subantarctic and Polar Fronts, and near the Subtropical Front are important in the compensation of the Eulerian mean flow. Article in Journal/Newspaper Antarc* Antarctic Drake Passage Southern Ocean CentAUR: Central Archive at the University of Reading Antarctic Southern Ocean The Antarctic Drake Passage Ocean Modelling 64 46 55 |
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Open Polar |
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CentAUR: Central Archive at the University of Reading |
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ftunivreading |
language |
unknown |
description |
The Southern Ocean circulation consists of a complicated mixture of processes and phenomena that arise at different time and spatial scales which need to be parametrized in the state-of-the-art climate models. The temporal and spatial scales that give rise to the present-day residual mean circulation are here investigated by calculating the Meridional Overturning Circulation (MOC) in density coordinates from an eddy-permitting global model. The region sensitive to the temporal decomposition is located between 38°S and 63°S, associated with the eddy-induced transport. The ‘‘Bolus’’ component of the residual circulation corresponds to the eddy-induced transport. It is dominated by timescales between 1 month and 1 year. The temporal behavior of the transient eddies is examined in splitting the ‘‘Bolus’’ component into a ‘‘Seasonal’’, an ‘‘Eddy’’ and an ‘‘Inter-monthly’’ component, respectively representing the correlation between density and velocity fluctuations due to the average seasonal cycle, due to mesoscale eddies and due to large-scale motion on timescales longer than one month that is not due to the seasonal cycle. The ‘‘Seasonal’’ bolus cell is important at all latitudes near the surface. The ‘‘Eddy’’ bolus cell is dominant in the thermocline between 50°S and 35°S and over the whole ocean depth at the latitude of the Drake Passage. The ‘‘Inter-monthly’’ bolus cell is important in all density classes and is maximal in the Brazil–Malvinas Confluence and the Agulhas Return Current. The spatial decomposition indicates that a large part of the Eulerian mean circulation is recovered for spatial scales larger than 11.25°, implying that small-scale meanders in the Antarctic Circumpolar Current (ACC), near the Subantarctic and Polar Fronts, and near the Subtropical Front are important in the compensation of the Eulerian mean flow. |
format |
Article in Journal/Newspaper |
author |
Ballarotta, Maxime Drijfhout, Sybren Kuhlbrodt, Till Döös, Kristofer |
spellingShingle |
Ballarotta, Maxime Drijfhout, Sybren Kuhlbrodt, Till Döös, Kristofer The residual circulation of the Southern Ocean: which spatio-temporal scales are needed? |
author_facet |
Ballarotta, Maxime Drijfhout, Sybren Kuhlbrodt, Till Döös, Kristofer |
author_sort |
Ballarotta, Maxime |
title |
The residual circulation of the Southern Ocean: which spatio-temporal scales are needed? |
title_short |
The residual circulation of the Southern Ocean: which spatio-temporal scales are needed? |
title_full |
The residual circulation of the Southern Ocean: which spatio-temporal scales are needed? |
title_fullStr |
The residual circulation of the Southern Ocean: which spatio-temporal scales are needed? |
title_full_unstemmed |
The residual circulation of the Southern Ocean: which spatio-temporal scales are needed? |
title_sort |
residual circulation of the southern ocean: which spatio-temporal scales are needed? |
publisher |
Elsevier |
publishDate |
2013 |
url |
https://centaur.reading.ac.uk/34252/ |
geographic |
Antarctic Southern Ocean The Antarctic Drake Passage |
geographic_facet |
Antarctic Southern Ocean The Antarctic Drake Passage |
genre |
Antarc* Antarctic Drake Passage Southern Ocean |
genre_facet |
Antarc* Antarctic Drake Passage Southern Ocean |
op_relation |
Ballarotta, M., Drijfhout, S., Kuhlbrodt, T. <https://centaur.reading.ac.uk/view/creators/90000754.html> orcid:0000-0003-2328-6729 and Döös, K. (2013) The residual circulation of the Southern Ocean: which spatio-temporal scales are needed? Ocean Modelling, 64. pp. 46-55. ISSN 1463-5003 doi: https://doi.org/10.1016/j.ocemod.2013.01.005 <https://doi.org/10.1016/j.ocemod.2013.01.005> |
container_title |
Ocean Modelling |
container_volume |
64 |
container_start_page |
46 |
op_container_end_page |
55 |
_version_ |
1802650651195342848 |