Deep Western Boundary Current transport variability in the South Atlantic: preliminary results from a pilot array at 34.5° S
The first direct estimates of the temporal variability of the absolute transport in the Deep Western Boundary Current (DWBC) at 34.5° S in the South Atlantic Ocean are obtained using just under one year of data from a line of four pressure-equipped inverted echo sounders. Hydrographic sections colle...
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ftdoajarticles:oai:doaj.org/article:5b5d402d51f347158eb22e2e3646cf79 2023-05-15T17:35:00+02:00 Deep Western Boundary Current transport variability in the South Atlantic: preliminary results from a pilot array at 34.5° S C. S. Meinen A. R. Piola R. C. Perez S. L. Garzoli 2012-11-01T00:00:00Z https://doi.org/10.5194/os-8-1041-2012 https://doaj.org/article/5b5d402d51f347158eb22e2e3646cf79 EN eng Copernicus Publications http://www.ocean-sci.net/8/1041/2012/os-8-1041-2012.pdf https://doaj.org/toc/1812-0784 https://doaj.org/toc/1812-0792 doi:10.5194/os-8-1041-2012 1812-0784 1812-0792 https://doaj.org/article/5b5d402d51f347158eb22e2e3646cf79 Ocean Science, Vol 8, Iss 6, Pp 1041-1054 (2012) Geography. Anthropology. Recreation G Environmental sciences GE1-350 article 2012 ftdoajarticles https://doi.org/10.5194/os-8-1041-2012 2022-12-31T13:27:04Z The first direct estimates of the temporal variability of the absolute transport in the Deep Western Boundary Current (DWBC) at 34.5° S in the South Atlantic Ocean are obtained using just under one year of data from a line of four pressure-equipped inverted echo sounders. Hydrographic sections collected in 2009 and 2010 confirm, based on neutral density, temperature, salinity, and oxygen values, the presence of the DWBC, one of the main deep pathways of the Meridional Overturning Circulation. Both data sets indicate that the DWBC reconstitutes itself after breaking into eddies in the western sub-tropical Atlantic near 8° S. The amplitude and spectral character of the DWBC transport variability are comparable with those observed in the North Atlantic, where longer records exist, with the DWBC at 34.5° S exhibiting a transport standard deviation of 25 Sv and variations of ∼ 40 Sv occurring within periods as short as a few days. There is little indication of an annual cycle in the DWBC transports, although the observational records are too short to be definitive. A Monte Carlo-style analysis using 27 yr of model output from the same location as the observations indicates that about 48–60 months of data will be required to fully assess the deep transport variability. The model suggests the presence of an annual cycle in DWBC transport, however its statistical significance with even 27 yr of model output is low, suggesting that seasonal variations in the model are weak. Article in Journal/Newspaper North Atlantic South Atlantic Ocean Directory of Open Access Journals: DOAJ Articles Ocean Science 8 6 1041 1054 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 |
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Geography. Anthropology. Recreation G Environmental sciences GE1-350 C. S. Meinen A. R. Piola R. C. Perez S. L. Garzoli Deep Western Boundary Current transport variability in the South Atlantic: preliminary results from a pilot array at 34.5° S |
topic_facet |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 |
description |
The first direct estimates of the temporal variability of the absolute transport in the Deep Western Boundary Current (DWBC) at 34.5° S in the South Atlantic Ocean are obtained using just under one year of data from a line of four pressure-equipped inverted echo sounders. Hydrographic sections collected in 2009 and 2010 confirm, based on neutral density, temperature, salinity, and oxygen values, the presence of the DWBC, one of the main deep pathways of the Meridional Overturning Circulation. Both data sets indicate that the DWBC reconstitutes itself after breaking into eddies in the western sub-tropical Atlantic near 8° S. The amplitude and spectral character of the DWBC transport variability are comparable with those observed in the North Atlantic, where longer records exist, with the DWBC at 34.5° S exhibiting a transport standard deviation of 25 Sv and variations of ∼ 40 Sv occurring within periods as short as a few days. There is little indication of an annual cycle in the DWBC transports, although the observational records are too short to be definitive. A Monte Carlo-style analysis using 27 yr of model output from the same location as the observations indicates that about 48–60 months of data will be required to fully assess the deep transport variability. The model suggests the presence of an annual cycle in DWBC transport, however its statistical significance with even 27 yr of model output is low, suggesting that seasonal variations in the model are weak. |
format |
Article in Journal/Newspaper |
author |
C. S. Meinen A. R. Piola R. C. Perez S. L. Garzoli |
author_facet |
C. S. Meinen A. R. Piola R. C. Perez S. L. Garzoli |
author_sort |
C. S. Meinen |
title |
Deep Western Boundary Current transport variability in the South Atlantic: preliminary results from a pilot array at 34.5° S |
title_short |
Deep Western Boundary Current transport variability in the South Atlantic: preliminary results from a pilot array at 34.5° S |
title_full |
Deep Western Boundary Current transport variability in the South Atlantic: preliminary results from a pilot array at 34.5° S |
title_fullStr |
Deep Western Boundary Current transport variability in the South Atlantic: preliminary results from a pilot array at 34.5° S |
title_full_unstemmed |
Deep Western Boundary Current transport variability in the South Atlantic: preliminary results from a pilot array at 34.5° S |
title_sort |
deep western boundary current transport variability in the south atlantic: preliminary results from a pilot array at 34.5° s |
publisher |
Copernicus Publications |
publishDate |
2012 |
url |
https://doi.org/10.5194/os-8-1041-2012 https://doaj.org/article/5b5d402d51f347158eb22e2e3646cf79 |
genre |
North Atlantic South Atlantic Ocean |
genre_facet |
North Atlantic South Atlantic Ocean |
op_source |
Ocean Science, Vol 8, Iss 6, Pp 1041-1054 (2012) |
op_relation |
http://www.ocean-sci.net/8/1041/2012/os-8-1041-2012.pdf https://doaj.org/toc/1812-0784 https://doaj.org/toc/1812-0792 doi:10.5194/os-8-1041-2012 1812-0784 1812-0792 https://doaj.org/article/5b5d402d51f347158eb22e2e3646cf79 |
op_doi |
https://doi.org/10.5194/os-8-1041-2012 |
container_title |
Ocean Science |
container_volume |
8 |
container_issue |
6 |
container_start_page |
1041 |
op_container_end_page |
1054 |
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1766134012962668544 |