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Circulation dynamics in the bottom limit layer of the Cruzeiro do Sul rift (Rio Grande Rise; 28S, 39°W--35°S, 32°W)

Grant number: 20/04315-0
Support type:Scholarships in Brazil - Master
Effective date (Start): September 01, 2020
Effective date (End): January 31, 2022
Field of knowledge:Physical Sciences and Mathematics - Oceanography - Physical Oceanography
Principal researcher:Ilson Carlos Almeida da SIlveira
Grantee:Pedro Walfir Martins e Souza Neto
Home Institution: Instituto Oceanográfico (IO). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

The Southwest Atlantic is one of the most unexplored parts of the world ocean. The Rio Grande Rise (RGR) is located in this region and is the largest Plateau of the South Atlantic, presenting the formation of polymetallic crusts, which arouses political and economic interest in the region. The graben Cruzeiro do Sul Rift (CSR) cuts the RGR from northwest to southeast and presents a unique hydrodynamics in the region. Thus, it is extremely important to understand how the flow is inside the graben, especially close to the bottom boundary layer, since it controls the deposition of sediments, a factor that determines the exposure of polymeric crusts. This proposal aims to characterize the circulation patterns within the CSR, with an emphasis on the bottom boundary layer and its surroundings. The development of this work will occur through the analysis of data from the mooring array and profiling of CTD and LADCP obtained by the Marine-Etech project (Proc. FAPESP: 2014/50820-7), in addition to the development of a numerical model. From the analysis, profiles, sections, time series and numerical simulations will be developed to reveal the circulation pattern inside the CSR. (AU)