Diapycnal and isopycnal transports in the Southern Ocean estimated by a box inverse model
Quantitative descriptions of Circumpolar Deep Water upwelling and evolution into a lighter mode and heavier bottom waters in the Southern Ocean are still not well constrained. Here, data from two occupations of eight hydrographic sections are combined and used in a box inverse model to estimate isop...
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ftunivtasecite:oai:ecite.utas.edu.au:119106 2023-05-15T13:49:03+02:00 Diapycnal and isopycnal transports in the Southern Ocean estimated by a box inverse model Katsumata, K Sloyan, BM Masuda, S 2013 application/pdf https://doi.org/10.1175/JPO-D-12-0210.1 http://ecite.utas.edu.au/119106 en eng Amer Meteorological Soc http://ecite.utas.edu.au/119106/1/Diapycnal and Isopycnal Transports.pdf http://dx.doi.org/10.1175/JPO-D-12-0210.1 Katsumata, K and Sloyan, BM and Masuda, S, Diapycnal and isopycnal transports in the Southern Ocean estimated by a box inverse model, Journal of Physical Oceanography, 43, (11) pp. 2270-2287. ISSN 0022-3670 (2013) [Refereed Article] http://ecite.utas.edu.au/119106 Earth Sciences Oceanography Physical Oceanography Refereed Article PeerReviewed 2013 ftunivtasecite https://doi.org/10.1175/JPO-D-12-0210.1 2019-12-13T22:18:22Z Quantitative descriptions of Circumpolar Deep Water upwelling and evolution into a lighter mode and heavier bottom waters in the Southern Ocean are still not well constrained. Here, data from two occupations of eight hydrographic sections are combined and used in a box inverse model to estimate isopycnal and diapycnal transports in the Southern Ocean. A mixed layer box allows diapycnal transports in the surface mixed layer to be estimated separately. Current velocity at 1000 dbar was constrained by the mean velocity field estimated from subsurface float drift data. The estimated isopycnal transports are largely consistent with past estimates and with outputs of three ocean general circulation models. The estimated subduction and upwelling at the base of the Southern Ocean mixed layer show that Upper Circumpolar Deep Water upwells [16 15 and 17 21 Sv (where 1Sv ≡ 106m 3 s -1 ) by different inversion methods] and evolves into heavier Lower Circumpolar Deep Water (5 13 and 6 18 Sv) and Bottom Water (8 9 and 8 13 Sv) or lighter Mode and Intermediate Waters (9 18 and 13 24 Sv). Meridional transport in the surface mixed layer is due to northward Ekman transport and mostly southward eddy transport. In seasonal ice-covered areas near Antarctica, a significant (14 14 Sv) southward transport was found. The southward eddy transport is largest north of the Antarctic Circumpolar Current and decreases poleward because of the poleward decrease in the eddy diffusivity. The interior diapycnal transports, which can be either upward (gaining buoyancy) or downward (gaining density), are comparable in magnitude to the horizontal diapycnal transports within the surface mixed layer. Article in Journal/Newspaper Antarc* Antarctic Antarctica Southern Ocean ice covered areas eCite UTAS (University of Tasmania) Antarctic Southern Ocean The Antarctic Journal of Physical Oceanography 43 11 2270 2287 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Oceanography Physical Oceanography |
spellingShingle |
Earth Sciences Oceanography Physical Oceanography Katsumata, K Sloyan, BM Masuda, S Diapycnal and isopycnal transports in the Southern Ocean estimated by a box inverse model |
topic_facet |
Earth Sciences Oceanography Physical Oceanography |
description |
Quantitative descriptions of Circumpolar Deep Water upwelling and evolution into a lighter mode and heavier bottom waters in the Southern Ocean are still not well constrained. Here, data from two occupations of eight hydrographic sections are combined and used in a box inverse model to estimate isopycnal and diapycnal transports in the Southern Ocean. A mixed layer box allows diapycnal transports in the surface mixed layer to be estimated separately. Current velocity at 1000 dbar was constrained by the mean velocity field estimated from subsurface float drift data. The estimated isopycnal transports are largely consistent with past estimates and with outputs of three ocean general circulation models. The estimated subduction and upwelling at the base of the Southern Ocean mixed layer show that Upper Circumpolar Deep Water upwells [16 15 and 17 21 Sv (where 1Sv ≡ 106m 3 s -1 ) by different inversion methods] and evolves into heavier Lower Circumpolar Deep Water (5 13 and 6 18 Sv) and Bottom Water (8 9 and 8 13 Sv) or lighter Mode and Intermediate Waters (9 18 and 13 24 Sv). Meridional transport in the surface mixed layer is due to northward Ekman transport and mostly southward eddy transport. In seasonal ice-covered areas near Antarctica, a significant (14 14 Sv) southward transport was found. The southward eddy transport is largest north of the Antarctic Circumpolar Current and decreases poleward because of the poleward decrease in the eddy diffusivity. The interior diapycnal transports, which can be either upward (gaining buoyancy) or downward (gaining density), are comparable in magnitude to the horizontal diapycnal transports within the surface mixed layer. |
format |
Article in Journal/Newspaper |
author |
Katsumata, K Sloyan, BM Masuda, S |
author_facet |
Katsumata, K Sloyan, BM Masuda, S |
author_sort |
Katsumata, K |
title |
Diapycnal and isopycnal transports in the Southern Ocean estimated by a box inverse model |
title_short |
Diapycnal and isopycnal transports in the Southern Ocean estimated by a box inverse model |
title_full |
Diapycnal and isopycnal transports in the Southern Ocean estimated by a box inverse model |
title_fullStr |
Diapycnal and isopycnal transports in the Southern Ocean estimated by a box inverse model |
title_full_unstemmed |
Diapycnal and isopycnal transports in the Southern Ocean estimated by a box inverse model |
title_sort |
diapycnal and isopycnal transports in the southern ocean estimated by a box inverse model |
publisher |
Amer Meteorological Soc |
publishDate |
2013 |
url |
https://doi.org/10.1175/JPO-D-12-0210.1 http://ecite.utas.edu.au/119106 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctica Southern Ocean ice covered areas |
genre_facet |
Antarc* Antarctic Antarctica Southern Ocean ice covered areas |
op_relation |
http://ecite.utas.edu.au/119106/1/Diapycnal and Isopycnal Transports.pdf http://dx.doi.org/10.1175/JPO-D-12-0210.1 Katsumata, K and Sloyan, BM and Masuda, S, Diapycnal and isopycnal transports in the Southern Ocean estimated by a box inverse model, Journal of Physical Oceanography, 43, (11) pp. 2270-2287. ISSN 0022-3670 (2013) [Refereed Article] http://ecite.utas.edu.au/119106 |
op_doi |
https://doi.org/10.1175/JPO-D-12-0210.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
43 |
container_issue |
11 |
container_start_page |
2270 |
op_container_end_page |
2287 |
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1766250716888825856 |