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. The results of two high-resolution ocean global circulation models – OGCMs (Hybrid Coordinate Ocean Model – HYCOM and Ocean Circulation andClimate Advanced Modeling Project – OCCAM) are analyzed with a focus on the Western Boundary Current (WBC) system of the South Atlantic Ocean. The volumetransports are calculated for different isopycnal ranges, which represent the most important water masses present in this region. The latitude of bifurcation of the zonalflows reaching the coast, which leads to the formation of southward or northward WBC flow at different depths (or isopycnal levels) is evaluated. For the Tropical Water,bifurcation of the South Equatorial Current occurs at 13◦-15◦S, giving rise to the Brazil Current, for the South Atlantic Central Water this process occurs at 22◦S.For the Antarctic Intermediate Water, bifurcation occurs near 28◦-30◦S, giving rise to a baroclinic unstable WBC at lower latitudes with a very strong vertical shearat mid-depths. Both models give similar results that are also consistent with previous observational studies. Observations of the South Atlantic WBC system havepreviously been sparse, consequently these two independent simulations which are based on realistic high-resolution OGCMs, add confidence to the values presentedin the literature regarding flow bifurcations at the Brazilian coast. Keywords: Southwestern Atlantic circulation, water mass, OCCAM, HYCOM. RESUMO. Resultados de dois modelos globais de alta resolucao (HYCOM e OCCAM) sao analisados focando o sistema de Corrente de Contorno Oeste do Oceano Atlântico Sul. Os transportes de volume sao calculados para diferentes niveis isopicnais que representam as principais massas de agua da regiao. E apresentada a avaliacao da latitude de bifurcacao do fluxo zonal que atinge a costa, permitindo a formacao dos fluxos da Corrente de Contorno Oeste para o sul e para o norte emdiferentes niveis de profundidades (ou isopicnal). Para a Agua Tropical, a bifurcacao da Corrente Sul Equatorial ocorre entre 13◦-15◦S, originando a Corrente do Brasil, e para a Agua Central do Atlântico Sul ocorre em 22◦S. A bifurcacao daAgua Intermediaria Antartica ocorre proximo de 28◦-30◦S, dando um aumento na instabilidade baroclinica da Corrente de Contorno Oeste em baixas latitudes e com um forte cisalhamento vertical em profundidades intermediarias. Ambos os modelos apresentamresultados similares e consistentes com estudos observacionais previos. Considerando que as observacoes do sistema de Corrente de Contorno Oeste do Atlântico Sul sao escassas, essas duas simulacoes independentes com modelos globais de alta resolucao adicionam confianca aos valores apresentados na literatura, relacionadosaos fluxos das bifurcacoes na costa do Brasil. Palavras-chave: circulacao do Atlântico Sudoeste, massas de agua, OCCAM, HYCOM.

THE BIFURCATION OF THE WESTERN BOUNDARY CURRENT SYSTEM OF THE SOUTH ATLANTIC OCEAN