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Dipole-induced Central Water extrusions south of Abrolhos Bank (Brazil, 20.5 degrees S)

Texto completo
Arruda, Wilton Z. [1] ; da Silveira, Ilson C. A. [2]
Número total de Autores: 2
Afiliação do(s) autor(es):
[1] Univ Fed Rio de Janeiro, Inst Matemat, Dept Matemat, Rio De Janeiro, RJ - Brazil
[2] Univ Sao Paulo, Inst Oceanog, Dept Oceanog Fis Quim & Geol, Sao Paulo, SP - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Citações Web of Science: 0

In this work, we describe a mechanism by which South Atlantic Central Water is upwelled to shelf-break levels, subsequently mixed with the Tropical Water in the upper portion of the water column, and advected oceanward as a plume, reaching a distance of more than 250 km from the shelf break. This process is due to the coupling of two quasi-stationary Brazil Current (BC) mesoscale features: the anticyclonic Abrolhos Eddy (AE) and the cyclonic Vitoria Eddy (VE), located north and south of the Vitoria-Trindade Ridge (similar to 20.5 degrees S) respectively. As they pair around a topographic feature known as Besnard Bank, they form an eddy dipole with a similar to 2 Sv velocity-intensified BC channeled between the two eddies. During an AE-VE dipole event the BC acquires a cross-isobath direction, which causes horizontal divergence near the shelf break. Therefore, in this scenario, the BC turns into a jet that ejects a nutrient-rich central water mix toward the deep ocean. Considering that we can track the nutrient-rich tongue of water by its higher chlorophyll-a signature, it may be relevant in the understanding of the pelagial biota ecology of the surroundings. (AU)

Processo FAPESP: 15/21729-4 - O papel da Cadeia Vitória-Trindade na geração de dinâmica de sub e meso-escalas
Beneficiário:Ilson Carlos Almeida da SIlveira
Linha de fomento: Auxílio à Pesquisa - Regular