The Western South Atlantic Sea Surface Temperature and Brazil Current Volume Transport at 30°S: a Study Based on the Brazilian Earth System Model 2.5 Historical Simulations

Authors

DOI:

https://doi.org/10.11137/1982-3908_2025_48_58990

Keywords:

BESM-OA2.5, Coupled modeling, Oceanographic analysis

Abstract

The analyses of sea surface temperature (SST) in the western portion of the South Atlantic and the integrated volume transport of the Brazil Current (BCVT) at 30°S were conducted using historical results (Jan/1993-Nov/2005) from the Brazilian Earth System Model version 2.5 (BESM-OA2.5) and comparing them with those from the 2M version of the Geophysical Fluid Dynamics Laboratory Earth System Model (GFDL-ESM2M) and the Global Ocean Physics Reanalysis 12V1 (GLORYS12V1). The GHRSST Level 4 AVHRR_OI Global Blended Sea Surface Temperature Analysis (GHRSSTL4) product was used to validate these results. A tendency of overestimation of SST values by the Brazilian model was observed by approximately 1.07°C compared to GHRSSTL4. The BCVT results at 30°S indicated an average value of 10.54±4.68, 6.79±1.40, and 11.99±4.16 Sv for BESM-OA2.5, GFDL-ESM2M, and GLORYS12V1, respectively. For the Brazil-Malvinas Confluence region, the authors found a mean Bias of 3.76 °C with a maximum of 10.38 °C according to BESM-OA2.5 results in relation to GHRSSTL4. Compared to other studies, the BCVT values obtained were lower due to the use of more direct observational data, such as current meters and buoys by other authors. Additionally, the low spatial resolution of the models used may limit the detailed representation of the Brazil Current.

Author Biographies

Leonardo Salles Köhler, Universidade Federal do Rio de Janeiro, Instituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa em Engenharia, Programa de Engenharia Civil

Oceanógrafo formado pela UERJ em 2019 e cursando mestrado em Engenharia Civil pela COPPE/UFRJ na área de Recursos Hídricos e Meio Ambiente e linha de pesquisa voltada para Modelagem Ambiental Orientada à Indústria do Petróleo, Gás e Energia. 

Trabalhou como pesquisador no Laboratório de Métodos Computacionais em Engenharia / COPPE de 2019 a 2022 na área de modelagem ambiental.

Luiz Paulo de Freitas Assad, Universidade Federal do Rio de Janeiro, Instituto de Geociências, Departamento de Meteorologia

Graduação em Oceanografia pela UERJ (1996), mestrado em Oceanografia Física pela USP (2000) e doutorado em Engenharia Civil pela COPPE/UFRJ (2006). É professor adjunto do Departamento de Meteorologia da Universidade Federal do Rio de janeiro e professor permanente do Programa de Pós Graduação em Meteorologia do referido departamento. Além disso, é professor convidado do Programa de Engenharia Civil da COPPE/UFRJ.

Alexandre Macedo Fernandes, Universidade do Estado do Rio de Janeiro, Faculdade de Oceanografia, Departamento de Oceanografia Física e Meteorologia

PhD em Oceanografia Física pela Florida State University (2007). Atualmente, é professor Associado da Universidade do Estado do Rio de Janeiro (UERJ) atuando no Departamento de Oceanografia Física e Meteorologia da Faculdade de Oceanografia. A área de atuação tem como foco a Hidrodinâmica Marinha, dos estuários ao talude continental.

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Published

2025-04-24

How to Cite

Köhler, L. S., Assad, L. P. de F. and Fernandes, A. M. (2025) “The Western South Atlantic Sea Surface Temperature and Brazil Current Volume Transport at 30°S: a Study Based on the Brazilian Earth System Model 2.5 Historical Simulations”, Anuário do Instituto de Geociências. Rio de Janeiro, BR, 48. doi: 10.11137/1982-3908_2025_48_58990.

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Vol. 48 (2025): Anuário do Instituto de Geociências

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Environmental Sciences

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