Brazil Current Volume Transport Variability during 2009–2015 from a Long-Term Moored Array at 34.5°S
The Brazil Current, the western limb of the subtropical gyre of the South Atlantic Ocean, is one of the major Western Boundary Currents of the global ocean. Here, we present the first multiyear continuous daily time series of Brazil Current absolute volume transport obtained using 6+ years of observ...
Published in: | Journal of Geophysical Research: Oceans |
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ftzenodo:oai:zenodo.org:4749672 2024-09-15T17:48:33+00:00 Brazil Current Volume Transport Variability during 2009–2015 from a Long-Term Moored Array at 34.5°S M. P. Chidichimo A. R. Piola C. S. Meinen R. C. Perez E. J. D. Campos S. Dong R. Lumpkin S. L. Garzoli 2021-04-07 https://doi.org/10.1029/2020JC017146 unknown Zenodo https://zenodo.org/communities/iatlantic-project-collection https://zenodo.org/communities/eu https://doi.org/10.1029/2020JC017146 oai:zenodo.org:4749672 info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode info:eu-repo/semantics/article 2021 ftzenodo https://doi.org/10.1029/2020JC017146 2024-07-26T13:36:49Z The Brazil Current, the western limb of the subtropical gyre of the South Atlantic Ocean, is one of the major Western Boundary Currents of the global ocean. Here, we present the first multiyear continuous daily time series of Brazil Current absolute volume transport obtained using 6+ years of observations from a line of four pressure-recording inverted echo sounders (PIES) deployed at 34.5°S. The array was augmented in December 2012 with two current meter-equipped PIES and in December 2013 with a moored Acoustic Doppler Current Profiler on the upper continental slope. The Brazil Current is bounded by the sea surface and the neutral density interface separating South Atlantic Central Water and Antarctic Intermediate Water, which is on average at a reference pressure of 628 ± 46 dbar, and it is confined west of 49.5°W. The Brazil Current has a mean strength of −14.0 ± 2.8 Sv (1 Sv ≡ 10 6 m 3 s −1 negative indicates southward flow) with a temporal standard deviation of 8.8 Sv and peak-to-peak range from −41.7 to +20 Sv. About 80% of the absolute transport variance is concentrated at periods shorter than 150 days with a prominent peak at 100 days. The baroclinic component accounts for 85% of the absolute transport variance, but the barotropic variance is not negligible. The baroclinic and barotropic transports are uncorrelated, demonstrating the need to measure both transport components independently. Given the energetic high frequency transport variations, statistically significant seasonal to interannual variability and trends have yet to be detected. Article in Journal/Newspaper Antarc* Antarctic South Atlantic Ocean Zenodo Journal of Geophysical Research: Oceans 126 5 |
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The Brazil Current, the western limb of the subtropical gyre of the South Atlantic Ocean, is one of the major Western Boundary Currents of the global ocean. Here, we present the first multiyear continuous daily time series of Brazil Current absolute volume transport obtained using 6+ years of observations from a line of four pressure-recording inverted echo sounders (PIES) deployed at 34.5°S. The array was augmented in December 2012 with two current meter-equipped PIES and in December 2013 with a moored Acoustic Doppler Current Profiler on the upper continental slope. The Brazil Current is bounded by the sea surface and the neutral density interface separating South Atlantic Central Water and Antarctic Intermediate Water, which is on average at a reference pressure of 628 ± 46 dbar, and it is confined west of 49.5°W. The Brazil Current has a mean strength of −14.0 ± 2.8 Sv (1 Sv ≡ 10 6 m 3 s −1 negative indicates southward flow) with a temporal standard deviation of 8.8 Sv and peak-to-peak range from −41.7 to +20 Sv. About 80% of the absolute transport variance is concentrated at periods shorter than 150 days with a prominent peak at 100 days. The baroclinic component accounts for 85% of the absolute transport variance, but the barotropic variance is not negligible. The baroclinic and barotropic transports are uncorrelated, demonstrating the need to measure both transport components independently. Given the energetic high frequency transport variations, statistically significant seasonal to interannual variability and trends have yet to be detected. |
format |
Article in Journal/Newspaper |
author |
M. P. Chidichimo A. R. Piola C. S. Meinen R. C. Perez E. J. D. Campos S. Dong R. Lumpkin S. L. Garzoli |
spellingShingle |
M. P. Chidichimo A. R. Piola C. S. Meinen R. C. Perez E. J. D. Campos S. Dong R. Lumpkin S. L. Garzoli Brazil Current Volume Transport Variability during 2009–2015 from a Long-Term Moored Array at 34.5°S |
author_facet |
M. P. Chidichimo A. R. Piola C. S. Meinen R. C. Perez E. J. D. Campos S. Dong R. Lumpkin S. L. Garzoli |
author_sort |
M. P. Chidichimo |
title |
Brazil Current Volume Transport Variability during 2009–2015 from a Long-Term Moored Array at 34.5°S |
title_short |
Brazil Current Volume Transport Variability during 2009–2015 from a Long-Term Moored Array at 34.5°S |
title_full |
Brazil Current Volume Transport Variability during 2009–2015 from a Long-Term Moored Array at 34.5°S |
title_fullStr |
Brazil Current Volume Transport Variability during 2009–2015 from a Long-Term Moored Array at 34.5°S |
title_full_unstemmed |
Brazil Current Volume Transport Variability during 2009–2015 from a Long-Term Moored Array at 34.5°S |
title_sort |
brazil current volume transport variability during 2009–2015 from a long-term moored array at 34.5°s |
publisher |
Zenodo |
publishDate |
2021 |
url |
https://doi.org/10.1029/2020JC017146 |
genre |
Antarc* Antarctic South Atlantic Ocean |
genre_facet |
Antarc* Antarctic South Atlantic Ocean |
op_relation |
https://zenodo.org/communities/iatlantic-project-collection https://zenodo.org/communities/eu https://doi.org/10.1029/2020JC017146 oai:zenodo.org:4749672 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode |
op_doi |
https://doi.org/10.1029/2020JC017146 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
126 |
container_issue |
5 |
_version_ |
1810289880209555456 |