Articles | Volume 15, issue 3
Clim. Past, 15, 943–955, 2019
https://doi.org/10.5194/cp-15-943-2019
Clim. Past, 15, 943–955, 2019
https://doi.org/10.5194/cp-15-943-2019

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 et al.

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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.