Water mass transformation and subduction in the South Atlantic
The transformation of water masses induced by air–sea fluxes in the South Atlantic Ocean is calculated with a global ocean model, Ocean Circulation and Climate Advanced Modeling (OCCAM), and has been compared with several observational datasets. Air–sea interaction supplies buoyancy to the ocean at...
Published in: | Journal of Physical Oceanography |
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ftsouthampton:oai:eprints.soton.ac.uk:349161 2023-07-30T03:57:40+02:00 Water mass transformation and subduction in the South Atlantic Donners, J. Drijfhout, S.S. Hazeleger, W. 2005-10 https://eprints.soton.ac.uk/349161/ unknown Donners, J., Drijfhout, S.S. and Hazeleger, W. (2005) Water mass transformation and subduction in the South Atlantic. Journal of Physical Oceanography, 35 (10), 1841-1860. (doi:10.1175/JPO2782.1 <http://dx.doi.org/10.1175/JPO2782.1>). Article PeerReviewed 2005 ftsouthampton https://doi.org/10.1175/JPO2782.1 2023-07-09T21:44:43Z The transformation of water masses induced by air–sea fluxes in the South Atlantic Ocean is calculated with a global ocean model, Ocean Circulation and Climate Advanced Modeling (OCCAM), and has been compared with several observational datasets. Air–sea interaction supplies buoyancy to the ocean at almost all density levels. The uncertainty of the estimates of water mass transformations is at least 10 Sv (Sv ? 106 m3 s?1), largely caused by the uncertainties in heat fluxes. Further analysis of the buoyancy budget of the mixed layer in the OCCAM model shows that diffusion extracts buoyancy from the water column at all densities. In agreement with observations, water mass formation of surface water by air–sea interaction is completely balanced by consumption from diffusion. There is a large interocean exchange with the Indian and Pacific Oceans. Intermediate water is imported from the Pacific, and light surface water is imported from the Indian Ocean. South Atlantic Central Water and denser water masses are exported to the Indian Ocean. The air–sea formation rate is only a qualitative estimate of the sum of subduction and interocean exchange. Subduction generates teleconnections between the South Atlantic and remote areas where these water masses reemerge in the mixed layer. Therefore, the subduction is analyzed with a Lagrangian trajectory analysis. Surface water obducts in the South Atlantic, while all other water masses experience net subduction. The subducted Antarctic Intermediate Water and Subantarctic Mode Water reemerge mainly in the Antarctic Circumpolar Current farther downstream. Lighter waters reemerge in the eastern tropical Atlantic. As a result, the extratropical South Atlantic has a strong link with the tropical Atlantic basin and only a weak direct link with the extratropical North Atlantic. The impact of the South Atlantic on the upper branch of the thermohaline circulation is indirect: water is significantly transformed by air–sea fluxes and mixing in the South Atlantic, but most of it reemerges ... Article in Journal/Newspaper Antarc* Antarctic North Atlantic South Atlantic Ocean University of Southampton: e-Prints Soton Antarctic The Antarctic Pacific Indian Journal of Physical Oceanography 35 10 1841 1860 |
institution |
Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
unknown |
description |
The transformation of water masses induced by air–sea fluxes in the South Atlantic Ocean is calculated with a global ocean model, Ocean Circulation and Climate Advanced Modeling (OCCAM), and has been compared with several observational datasets. Air–sea interaction supplies buoyancy to the ocean at almost all density levels. The uncertainty of the estimates of water mass transformations is at least 10 Sv (Sv ? 106 m3 s?1), largely caused by the uncertainties in heat fluxes. Further analysis of the buoyancy budget of the mixed layer in the OCCAM model shows that diffusion extracts buoyancy from the water column at all densities. In agreement with observations, water mass formation of surface water by air–sea interaction is completely balanced by consumption from diffusion. There is a large interocean exchange with the Indian and Pacific Oceans. Intermediate water is imported from the Pacific, and light surface water is imported from the Indian Ocean. South Atlantic Central Water and denser water masses are exported to the Indian Ocean. The air–sea formation rate is only a qualitative estimate of the sum of subduction and interocean exchange. Subduction generates teleconnections between the South Atlantic and remote areas where these water masses reemerge in the mixed layer. Therefore, the subduction is analyzed with a Lagrangian trajectory analysis. Surface water obducts in the South Atlantic, while all other water masses experience net subduction. The subducted Antarctic Intermediate Water and Subantarctic Mode Water reemerge mainly in the Antarctic Circumpolar Current farther downstream. Lighter waters reemerge in the eastern tropical Atlantic. As a result, the extratropical South Atlantic has a strong link with the tropical Atlantic basin and only a weak direct link with the extratropical North Atlantic. The impact of the South Atlantic on the upper branch of the thermohaline circulation is indirect: water is significantly transformed by air–sea fluxes and mixing in the South Atlantic, but most of it reemerges ... |
format |
Article in Journal/Newspaper |
author |
Donners, J. Drijfhout, S.S. Hazeleger, W. |
spellingShingle |
Donners, J. Drijfhout, S.S. Hazeleger, W. Water mass transformation and subduction in the South Atlantic |
author_facet |
Donners, J. Drijfhout, S.S. Hazeleger, W. |
author_sort |
Donners, J. |
title |
Water mass transformation and subduction in the South Atlantic |
title_short |
Water mass transformation and subduction in the South Atlantic |
title_full |
Water mass transformation and subduction in the South Atlantic |
title_fullStr |
Water mass transformation and subduction in the South Atlantic |
title_full_unstemmed |
Water mass transformation and subduction in the South Atlantic |
title_sort |
water mass transformation and subduction in the south atlantic |
publishDate |
2005 |
url |
https://eprints.soton.ac.uk/349161/ |
geographic |
Antarctic The Antarctic Pacific Indian |
geographic_facet |
Antarctic The Antarctic Pacific Indian |
genre |
Antarc* Antarctic North Atlantic South Atlantic Ocean |
genre_facet |
Antarc* Antarctic North Atlantic South Atlantic Ocean |
op_relation |
Donners, J., Drijfhout, S.S. and Hazeleger, W. (2005) Water mass transformation and subduction in the South Atlantic. Journal of Physical Oceanography, 35 (10), 1841-1860. (doi:10.1175/JPO2782.1 <http://dx.doi.org/10.1175/JPO2782.1>). |
op_doi |
https://doi.org/10.1175/JPO2782.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
35 |
container_issue |
10 |
container_start_page |
1841 |
op_container_end_page |
1860 |
_version_ |
1772818765504839680 |