Forcing mechanisms of the circulation on the Brazilian Equatorial Shelf
The Brazilian Equatorial Shelf (BES) is a very dynamic region due to the influence of various forcings: trade winds, macrotides, the Amazon River, and the North Brazil Current (NBC). To investigate each forcing's role in BES circulation, a control simulation and three sensitivity simulations (w...
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Online Access: | http://hdl.handle.net/10261/341404 https://doi.org/10.1016/j.csr.2022.104811 |
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ftcsic:oai:digital.csic.es:10261/341404 2024-02-11T10:06:42+01:00 Forcing mechanisms of the circulation on the Brazilian Equatorial Shelf Aguiar, Alessandro L. Marta-Almeida, Martinho Cruz, Lilian O. Pereira, Janini Cirano, Mauro Petrobras Agência Nacional do Petróleo, Gás Natural e Biocombustíveis (Brasil) Conselho Nacional de Desenvolvimento Científico e Tecnológico (Brasil) 2022-09-15 http://hdl.handle.net/10261/341404 https://doi.org/10.1016/j.csr.2022.104811 unknown Elsevier http://dx.doi.org/10.1016/j.csr.2022.104811 Sí doi:10.1016/j.csr.2022.104811 e-issn: 1873-6955 issn: 0278-4343 Continental Shelf Research 247 : 104811 (2022) http://hdl.handle.net/10261/341404 none Regional modeling Wind-driven circulation Amazon river Climate change artículo 2022 ftcsic https://doi.org/10.1016/j.csr.2022.104811 2024-01-16T11:56:08Z The Brazilian Equatorial Shelf (BES) is a very dynamic region due to the influence of various forcings: trade winds, macrotides, the Amazon River, and the North Brazil Current (NBC). To investigate each forcing's role in BES circulation, a control simulation and three sensitivity simulations (without rivers, without tides, and without winds) were performed using the Regional Ocean Modeling System (ROMS) with a horizontal resolution of 1/24° and realistic forcings. The results showed that the NBC advected low-salinity waters from the Amazon River northwestward to Caribbean Sea and occasionally eastward through the NBC retroflection. The NBC exhibited the strongest flow when all forcings were included in the simulation. On the other hand, southeasterly winds inhibited the NBC retroflection system and, thus reducing its contribution to North Equatorial Counter Current (NECC) and Equatorial Undercurrent (EUC). The simulation without tides showed a plume more advected by the NBC and constricted to the first 10 m of the water column, while in the simulation without wind the plume was less advected northwestward by the weakened NBC and spread more toward the shelf break. The correlation analysis highlighted the complexity of the system, the complementarity of the forcings and their time-variable interdependence. The three sensitivity simulations and correlation analysis demonstrated the wind to be the main mechanism of the circulation in the BES. The sensitivity simulations also gave insight of how circulation would respond in a future scenario if climate changes persist. Previous studies suggest that the reduced Amazon runoff may indirectly weaken Atlantic ITCZ and thus trade winds causing a weakened circulation in tropical Atlantic. Our results show that this weakened circulation would advect even less fresh water northward, worsening the disturbances in North Atlantic due to the reduced freshwater supply. This work was financially supported by PETROBRAS, Brazil and the Brazilian oil regulatory agency ANP (Agência ... Article in Journal/Newspaper North Atlantic Digital.CSIC (Spanish National Research Council) Continental Shelf Research 247 104811 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
unknown |
topic |
Regional modeling Wind-driven circulation Amazon river Climate change |
spellingShingle |
Regional modeling Wind-driven circulation Amazon river Climate change Aguiar, Alessandro L. Marta-Almeida, Martinho Cruz, Lilian O. Pereira, Janini Cirano, Mauro Forcing mechanisms of the circulation on the Brazilian Equatorial Shelf |
topic_facet |
Regional modeling Wind-driven circulation Amazon river Climate change |
description |
The Brazilian Equatorial Shelf (BES) is a very dynamic region due to the influence of various forcings: trade winds, macrotides, the Amazon River, and the North Brazil Current (NBC). To investigate each forcing's role in BES circulation, a control simulation and three sensitivity simulations (without rivers, without tides, and without winds) were performed using the Regional Ocean Modeling System (ROMS) with a horizontal resolution of 1/24° and realistic forcings. The results showed that the NBC advected low-salinity waters from the Amazon River northwestward to Caribbean Sea and occasionally eastward through the NBC retroflection. The NBC exhibited the strongest flow when all forcings were included in the simulation. On the other hand, southeasterly winds inhibited the NBC retroflection system and, thus reducing its contribution to North Equatorial Counter Current (NECC) and Equatorial Undercurrent (EUC). The simulation without tides showed a plume more advected by the NBC and constricted to the first 10 m of the water column, while in the simulation without wind the plume was less advected northwestward by the weakened NBC and spread more toward the shelf break. The correlation analysis highlighted the complexity of the system, the complementarity of the forcings and their time-variable interdependence. The three sensitivity simulations and correlation analysis demonstrated the wind to be the main mechanism of the circulation in the BES. The sensitivity simulations also gave insight of how circulation would respond in a future scenario if climate changes persist. Previous studies suggest that the reduced Amazon runoff may indirectly weaken Atlantic ITCZ and thus trade winds causing a weakened circulation in tropical Atlantic. Our results show that this weakened circulation would advect even less fresh water northward, worsening the disturbances in North Atlantic due to the reduced freshwater supply. This work was financially supported by PETROBRAS, Brazil and the Brazilian oil regulatory agency ANP (Agência ... |
author2 |
Petrobras Agência Nacional do Petróleo, Gás Natural e Biocombustíveis (Brasil) Conselho Nacional de Desenvolvimento Científico e Tecnológico (Brasil) |
format |
Article in Journal/Newspaper |
author |
Aguiar, Alessandro L. Marta-Almeida, Martinho Cruz, Lilian O. Pereira, Janini Cirano, Mauro |
author_facet |
Aguiar, Alessandro L. Marta-Almeida, Martinho Cruz, Lilian O. Pereira, Janini Cirano, Mauro |
author_sort |
Aguiar, Alessandro L. |
title |
Forcing mechanisms of the circulation on the Brazilian Equatorial Shelf |
title_short |
Forcing mechanisms of the circulation on the Brazilian Equatorial Shelf |
title_full |
Forcing mechanisms of the circulation on the Brazilian Equatorial Shelf |
title_fullStr |
Forcing mechanisms of the circulation on the Brazilian Equatorial Shelf |
title_full_unstemmed |
Forcing mechanisms of the circulation on the Brazilian Equatorial Shelf |
title_sort |
forcing mechanisms of the circulation on the brazilian equatorial shelf |
publisher |
Elsevier |
publishDate |
2022 |
url |
http://hdl.handle.net/10261/341404 https://doi.org/10.1016/j.csr.2022.104811 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
http://dx.doi.org/10.1016/j.csr.2022.104811 Sí doi:10.1016/j.csr.2022.104811 e-issn: 1873-6955 issn: 0278-4343 Continental Shelf Research 247 : 104811 (2022) http://hdl.handle.net/10261/341404 |
op_rights |
none |
op_doi |
https://doi.org/10.1016/j.csr.2022.104811 |
container_title |
Continental Shelf Research |
container_volume |
247 |
container_start_page |
104811 |
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1790604594264408064 |