Articles | Volume 15, issue 3
Research article
27 May 2019
Research article |  | 27 May 2019

Understanding the mechanisms behind high glacial productivity in the southern Brazilian margin

Rodrigo da Costa Portilho-Ramos, Tainã Marcos Lima Pinho, Cristiano Mazur Chiessi, and Cátia Fernandes Barbosa

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Cited articles

Abelmann, A., Gersonde, R., Knorr, G., Zhang, X., Chapligin, B., Maier, E., Esper, O., Friedrichsen, H., Lohmann, G., Meyer, H., and Tiedemann, R.: The seasonal sea-ice zone in the glacial Southern Ocean as a carbon sink, Nat. Commun., 6, 8136,, 2015. 
Abrantes, F., Cermeno, P., Lopes, C., Romero, O., Matos, L., Van Iperen, J., Rufino, M., and Magalhães, V.: Diatoms Si uptake capacity drives carbon export in coastal upwelling systems, Biogeosciences, 13, 4099–4109,, 2016. 
Aguiar, A. L., Cirano, M., Pereira, J., and Marta-Almeida, M.: Upwelling processes along a western boundary current in the Abrolhos-Campos region of Brazil, Cont. Shelf Res., 85, 42–59,, 2014. 
André, A., Weiner, A., Quillévéré, F., Aurahs, R., Morard, R., Douady, C. J., de Garidel-Thoron, T., Escarguel, G., de Vargas, C., and Kucera, M.: The cryptic and the apparent reversed: lack of genetic differentiation within the morphologically diverse plexus of the planktonic foraminifer Globigerinoides sacculifer, Paleobiology, 39, 21–39,, 2013. 
Berger, A. and Loutre, M. F.: Insolation values for the climate of the last 10 million years, Quaternary Sci. Rev., 10, 297–317,, 1991. 
Short summary
Fossil microorganisms from the last glacial found in marine sediments collected off southern Brazil suggest that more productive austral summer upwelling and more frequent austral winter incursions of nutrient-rich waters from the Plata River boosted regional productivity year-round. While upwelling was more productive due to the higher silicon content from the Southern Ocean, more frequent riverine incursions were modulated by stronger alongshore southwesterly winds.