Data from: Isopycnal mixing suppression by the Antarctic Circumpolar Current and the Southern Ocean Meridional Overturning Circulation
The meridional overturning circulation (MOC) in the Southern Ocean is investigated using hydrographic observations combined with satellite measurements of sea surface height. A three-dimensional (spatial and vertical) estimate of the isopycnal eddy diffusivity in the Southern Ocean is obtained using...
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2020
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Online Access: | https://doi.org/10.5061/dryad.55bp8 |
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fttriple:oai:gotriple.eu:50|dedup_wf_001::f8e89ea10bdba56b16ba9db342ac9b0a 2023-05-15T13:46:29+02:00 Data from: Isopycnal mixing suppression by the Antarctic Circumpolar Current and the Southern Ocean Meridional Overturning Circulation Chapman, Christopher Sallée, Jean-Baptiste 2020-06-27 https://doi.org/10.5061/dryad.55bp8 en eng Dryad http://dx.doi.org/10.5061/dryad.55bp8 https://dx.doi.org/10.5061/dryad.55bp8 lic_creative-commons 10.5061/dryad.55bp8 oai:easy.dans.knaw.nl:easy-dataset:98219 oai:services.nod.dans.knaw.nl:Products/dans:oai:easy.dans.knaw.nl:easy-dataset:98219 10|openaire____::9e3be59865b2c1c335d32dae2fe7b254 10|re3data_____::94816e6421eeb072e7742ce6a9decc5f 10|re3data_____::84e123776089ce3c7a33db98d9cd15a8 10|eurocrisdris::fe4903425d9040f680d8610d9079ea14 re3data_____::r3d100000044 10|openaire____::081b82f96300b6a6e3d282bad31cb6e2 Recent (2005-2015) Physical Oceanography Life sciences medicine and health care Southern Ocean envir geo Dataset https://vocabularies.coar-repositories.org/resource_types/c_ddb1/ 2020 fttriple https://doi.org/10.5061/dryad.55bp8 2023-01-22T17:41:59Z The meridional overturning circulation (MOC) in the Southern Ocean is investigated using hydrographic observations combined with satellite measurements of sea surface height. A three-dimensional (spatial and vertical) estimate of the isopycnal eddy diffusivity in the Southern Ocean is obtained using the theory of Ferrari and Nikurashin that includes the influence of suppression of the diffusivity by the strong, time-mean flows. It is found that the eddy diffusivity is enhanced at depth, reaching a maximum at the critical layer near 1000 m. The estimate of diffusivity is used with a simple diffusive parameterization to estimate the meridional eddy volume flux. This estimate of eddy volume flux is combined with an estimate of the Ekman transport to reconstruct the time-mean overturning circulation. By comparing the reconstruction with, and without, suppression of the eddy diffusivity by the mean flow, the influence of the suppression on the overturning is illuminated. It is shown that the suppression of the eddy diffusivity results in a large reduction of interior eddy transports and a more realistic eddy-induced overturning circulation. Finally, a simple conceptual model is used to show that the MOC is influenced not only by the existence of enhanced diffusivity at depth but also by the details of the vertical structure of the eddy diffusivity, such as the depth of the critical layer. mapped_gamma_all_sources_2005Neutral Density (Jackett & McDougall, 1997) for the year 2005 (with annual and semi-annual harmonics) from 75S to 30S.mapped_gamma_all_sources_2006Neutral Density (Jackett & McDougall, 1997) for the year 2006 (with annual and semi-annual harmonics) from 75S to 30S.mapped_gamma_all_sources_2007Neutral Density (Jackett & McDougall, 1997) for the year 2007 (with annual and semi-annual harmonics) from 75S to 30S.mapped_gamma_all_sources_2008Neutral Density (Jackett & McDougall, 1997) for the year 2008 (with annual and semi-annual harmonics) from 75S to 30S.mapped_gamma_all_sources_2009Neutral ... Dataset Antarc* Antarctic Southern Ocean Unknown Antarctic Southern Ocean The Antarctic |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
Recent (2005-2015) Physical Oceanography Life sciences medicine and health care Southern Ocean envir geo |
spellingShingle |
Recent (2005-2015) Physical Oceanography Life sciences medicine and health care Southern Ocean envir geo Chapman, Christopher Sallée, Jean-Baptiste Data from: Isopycnal mixing suppression by the Antarctic Circumpolar Current and the Southern Ocean Meridional Overturning Circulation |
topic_facet |
Recent (2005-2015) Physical Oceanography Life sciences medicine and health care Southern Ocean envir geo |
description |
The meridional overturning circulation (MOC) in the Southern Ocean is investigated using hydrographic observations combined with satellite measurements of sea surface height. A three-dimensional (spatial and vertical) estimate of the isopycnal eddy diffusivity in the Southern Ocean is obtained using the theory of Ferrari and Nikurashin that includes the influence of suppression of the diffusivity by the strong, time-mean flows. It is found that the eddy diffusivity is enhanced at depth, reaching a maximum at the critical layer near 1000 m. The estimate of diffusivity is used with a simple diffusive parameterization to estimate the meridional eddy volume flux. This estimate of eddy volume flux is combined with an estimate of the Ekman transport to reconstruct the time-mean overturning circulation. By comparing the reconstruction with, and without, suppression of the eddy diffusivity by the mean flow, the influence of the suppression on the overturning is illuminated. It is shown that the suppression of the eddy diffusivity results in a large reduction of interior eddy transports and a more realistic eddy-induced overturning circulation. Finally, a simple conceptual model is used to show that the MOC is influenced not only by the existence of enhanced diffusivity at depth but also by the details of the vertical structure of the eddy diffusivity, such as the depth of the critical layer. mapped_gamma_all_sources_2005Neutral Density (Jackett & McDougall, 1997) for the year 2005 (with annual and semi-annual harmonics) from 75S to 30S.mapped_gamma_all_sources_2006Neutral Density (Jackett & McDougall, 1997) for the year 2006 (with annual and semi-annual harmonics) from 75S to 30S.mapped_gamma_all_sources_2007Neutral Density (Jackett & McDougall, 1997) for the year 2007 (with annual and semi-annual harmonics) from 75S to 30S.mapped_gamma_all_sources_2008Neutral Density (Jackett & McDougall, 1997) for the year 2008 (with annual and semi-annual harmonics) from 75S to 30S.mapped_gamma_all_sources_2009Neutral ... |
format |
Dataset |
author |
Chapman, Christopher Sallée, Jean-Baptiste |
author_facet |
Chapman, Christopher Sallée, Jean-Baptiste |
author_sort |
Chapman, Christopher |
title |
Data from: Isopycnal mixing suppression by the Antarctic Circumpolar Current and the Southern Ocean Meridional Overturning Circulation |
title_short |
Data from: Isopycnal mixing suppression by the Antarctic Circumpolar Current and the Southern Ocean Meridional Overturning Circulation |
title_full |
Data from: Isopycnal mixing suppression by the Antarctic Circumpolar Current and the Southern Ocean Meridional Overturning Circulation |
title_fullStr |
Data from: Isopycnal mixing suppression by the Antarctic Circumpolar Current and the Southern Ocean Meridional Overturning Circulation |
title_full_unstemmed |
Data from: Isopycnal mixing suppression by the Antarctic Circumpolar Current and the Southern Ocean Meridional Overturning Circulation |
title_sort |
data from: isopycnal mixing suppression by the antarctic circumpolar current and the southern ocean meridional overturning circulation |
publisher |
Dryad |
publishDate |
2020 |
url |
https://doi.org/10.5061/dryad.55bp8 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
10.5061/dryad.55bp8 oai:easy.dans.knaw.nl:easy-dataset:98219 oai:services.nod.dans.knaw.nl:Products/dans:oai:easy.dans.knaw.nl:easy-dataset:98219 10|openaire____::9e3be59865b2c1c335d32dae2fe7b254 10|re3data_____::94816e6421eeb072e7742ce6a9decc5f 10|re3data_____::84e123776089ce3c7a33db98d9cd15a8 10|eurocrisdris::fe4903425d9040f680d8610d9079ea14 re3data_____::r3d100000044 10|openaire____::081b82f96300b6a6e3d282bad31cb6e2 |
op_relation |
http://dx.doi.org/10.5061/dryad.55bp8 https://dx.doi.org/10.5061/dryad.55bp8 |
op_rights |
lic_creative-commons |
op_doi |
https://doi.org/10.5061/dryad.55bp8 |
_version_ |
1766243246770487296 |