Volume and Heat Transports by North Brazil Current Rings
A methodology that combines a 24-year long (January 1993 to December 2016) global dataset of eddy trajectories, derived from altimetry, with vertical temperature and salinity profiles from the EN4.2.0 database, derived from XBTs/MBTs, CTDs and Argo floats, was used to reconstruct the mean vertical s...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2022-07-01
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| Series: | Frontiers in Marine Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmars.2022.831098/full |
| _version_ | 1811323392916193280 |
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| author | Luana F. Bueno Vladimir S. Costa Vladimir S. Costa Guilherme N. Mill Guilherme N. Mill Afonso M. Paiva |
| author_facet | Luana F. Bueno Vladimir S. Costa Vladimir S. Costa Guilherme N. Mill Guilherme N. Mill Afonso M. Paiva |
| author_sort | Luana F. Bueno |
| collection | DOAJ |
| description | A methodology that combines a 24-year long (January 1993 to December 2016) global dataset of eddy trajectories, derived from altimetry, with vertical temperature and salinity profiles from the EN4.2.0 database, derived from XBTs/MBTs, CTDs and Argo floats, was used to reconstruct the mean vertical structure of North Brazil Current (NBC) rings, and to calculate some of their properties. The number of NBC rings formed each year varied from 2 to 8, with an annual-mean formation of 5.3 ± 1.5. During the analyzed period, 112 rings were sampled at least once, at various distances from the center of the rings, leading to a total of 1323 (604) temperature (salinity) profiles available to compute the mean NBC ring, depicting a large, surface intensified, and relatively shallow ring, with intense temperature and salinity anomalies. The meridional volume transport was estimated in 1.3 Sv (1Sv = 106 m3s-1) per ring, leading to an annualized transport of ~7 ± 2 Sv. The amount of South Atlantic Water (SAW) within the mean ring was estimated in ~40 to 60% of the ring volume. According to these estimates, NBC rings may be responsible in different years for approximately 20 to 80% of the northward volume transport associated with the upper limb of the Atlantic Meridional Overturning Circulation (AMOC), and approximately 15 to 55% of the meridional heat transport in the tropical Atlantic. |
| first_indexed | 2024-04-13T13:53:12Z |
| format | Article |
| id | doaj.art-49401c4a639f4fe58a108a3b3e8addbd |
| institution | Directory Open Access Journal |
| issn | 2296-7745 |
| language | English |
| last_indexed | 2024-04-13T13:53:12Z |
| publishDate | 2022-07-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Marine Science |
| spelling | doaj.art-49401c4a639f4fe58a108a3b3e8addbd2022-12-22T02:44:16ZengFrontiers Media S.A.Frontiers in Marine Science2296-77452022-07-01910.3389/fmars.2022.831098831098Volume and Heat Transports by North Brazil Current RingsLuana F. Bueno0Vladimir S. Costa1Vladimir S. Costa2Guilherme N. Mill3Guilherme N. Mill4Afonso M. Paiva5Ocean Engineering Program – COPPE, Universidade Federal do Rio de Janeiro, Rio de Janeiro, BrazilOcean Engineering Program – COPPE, Universidade Federal do Rio de Janeiro, Rio de Janeiro, BrazilOcean Predictions and Applications Division, Centro Euro-Mediterraneo sui Cambiamenti Climatici, Lecce, ItalyOcean Engineering Program – COPPE, Universidade Federal do Rio de Janeiro, Rio de Janeiro, BrazilDepartment of Oceanography, Universidade Federal do Espírito Santo, Vitória, BrazilOcean Engineering Program – COPPE, Universidade Federal do Rio de Janeiro, Rio de Janeiro, BrazilA methodology that combines a 24-year long (January 1993 to December 2016) global dataset of eddy trajectories, derived from altimetry, with vertical temperature and salinity profiles from the EN4.2.0 database, derived from XBTs/MBTs, CTDs and Argo floats, was used to reconstruct the mean vertical structure of North Brazil Current (NBC) rings, and to calculate some of their properties. The number of NBC rings formed each year varied from 2 to 8, with an annual-mean formation of 5.3 ± 1.5. During the analyzed period, 112 rings were sampled at least once, at various distances from the center of the rings, leading to a total of 1323 (604) temperature (salinity) profiles available to compute the mean NBC ring, depicting a large, surface intensified, and relatively shallow ring, with intense temperature and salinity anomalies. The meridional volume transport was estimated in 1.3 Sv (1Sv = 106 m3s-1) per ring, leading to an annualized transport of ~7 ± 2 Sv. The amount of South Atlantic Water (SAW) within the mean ring was estimated in ~40 to 60% of the ring volume. According to these estimates, NBC rings may be responsible in different years for approximately 20 to 80% of the northward volume transport associated with the upper limb of the Atlantic Meridional Overturning Circulation (AMOC), and approximately 15 to 55% of the meridional heat transport in the tropical Atlantic.https://www.frontiersin.org/articles/10.3389/fmars.2022.831098/fullinter-hemispheric exchangeAMOCSouth Atlantic Water transportNBC ring variabilityNBC mean ring |
| spellingShingle | Luana F. Bueno Vladimir S. Costa Vladimir S. Costa Guilherme N. Mill Guilherme N. Mill Afonso M. Paiva Volume and Heat Transports by North Brazil Current Rings Frontiers in Marine Science inter-hemispheric exchange AMOC South Atlantic Water transport NBC ring variability NBC mean ring |
| title | Volume and Heat Transports by North Brazil Current Rings |
| title_full | Volume and Heat Transports by North Brazil Current Rings |
| title_fullStr | Volume and Heat Transports by North Brazil Current Rings |
| title_full_unstemmed | Volume and Heat Transports by North Brazil Current Rings |
| title_short | Volume and Heat Transports by North Brazil Current Rings |
| title_sort | volume and heat transports by north brazil current rings |
| topic | inter-hemispheric exchange AMOC South Atlantic Water transport NBC ring variability NBC mean ring |
| url | https://www.frontiersin.org/articles/10.3389/fmars.2022.831098/full |
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