The north Brazil undercurrent and the wind driven hydrodynamics in Japaratuba submarine canyon, Brazil

  • Sergio Rafael Del-Giovannino Universidade de São Paulo, Instituto Oceanográfico, Departamento de Oceanografia Física https://orcid.org/0000-0002-5672-0731
  • Marcelo Dottori Universidade de São Paulo, Instituto Oceanográfico, Departamento de Oceanografia Física
  • Renato Parkinson Martins Petrobras, Centro de Pesquisas Leopoldo Américo Miguez de Mello
Keywords: Japaratuba submarine canyon, Wind-driven flow, North Brazil Undercurrent, Numerical modeling

Abstract

The circulation induced by the wind and the North Brazil Undercurrent (NBU) in and surrounding the Japaratuba submarine canyon on the continental shelf of the basin of Sergipe and Alagoas is described using numerical modeling. The numerical simulations were implemented to determine the canyon influence in the local hydrodynamics and in the volume flow normal to the coast, considering several different scenarios, including a homogeneous and stratified fields of temperature and salinity. Northeast and East winds favor an upward flow in the canyon, while Southeast and South winds privilege subsidence. Winds parallel to the coast cause greater volume flow in the canyon section: 40° winds (relative to true the North, parallel to the coast) caused the highest upward flow, while winds from 215° to 220° caused the highest subsidence. On the other hand, the NBU favors subsidence motion and seems to predominate over the wind forcing.

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Published
2020-03-26
How to Cite
Del-Giovannino, S., Dottori, M., & Martins, R. (2020). The north Brazil undercurrent and the wind driven hydrodynamics in Japaratuba submarine canyon, Brazil. Brazilian Journal of Oceanography, 67, e19221. https://doi.org/10.1590/S1679-87592019022106702
Section
Original Article