Autor(es)

Souza-Neto, Pedro W. M. ; da Silveira, Ilson C. A. ; Rocha, Cesar B. ; Lazaneo, Caue Z. ; Calil, Paulo H. R.

• Tipo de documento: Artigo Científico
• Fonte: PROGRESS IN OCEANOGRAPHY; v. 224, p. 13-pg., 2024-04-20.

Resumo

The Rio Grande Rise (RGR) is a plateau located at 31 degrees S in the Southwestern Atlantic, rising from 5916 m up to 161 m below the sea level. The RGR is an important site for future mining of Fe-Mn crusts and can lead to an expansion of Brazil's Exclusive Economic Zone. The Cruzeiro do Sul Rift (CSR) fault cuts through the RGR from southeast to northwest. In this study we characterize the RGR circulation, showing that M2 tides are the main source of variability in the region, with an amplitude that can reach 0.3 m s -1 , larger than the mean flow. These M2 tides are dominated by the baroclinic component and intensified near the bottom. The generation of M2 internal tides occurs mainly in the CSR slopes, with most energy converted from the barotropic tide being radiated away in the form of tidal beams. In addition, the impingement of the mean southern South Equatorial Current and tidal rectification generates anticyclonic circulations around the RGR peaks, with the latter mechanism being responsible for a bottom intensified anticyclonic circulation of 0.2 m s -1 . Finally, our results reveal that the RGR is a hotspot of internal tide generation in the Southwestern Atlantic. (AU)

• Processo FAPESP: 20/04315-0 - Dinâmica da circulação na camada limite de fundo da fenda Cruzeiro do Sul (Elevação do Rio Grande; 28S, 39°W--35°S, 32°W)
• Beneficiário: Pedro Walfir Martins e Souza Neto
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 21/13124-6 - A hidrodinâmica da Bacia de Santos: a interação entre a corrente do Brasil e os vórtices das Agulhas - Projeto HidroSan
• Beneficiário: Ilson Carlos Almeida da SIlveira
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 14/50820-7 - Marine ferromanganese deposits: a major resource of E-tech elements
• Beneficiário: Frederico Pereira Brandini
• Modalidade de apoio: Auxílio à Pesquisa - Temático