Globigerinoides ruber, Globigerina bulloides and MAT derived paleotemperatures for the lasts 772 kyr from cores GL-852 and GL-854 (Santos Basin, Southwest Atlantic)

Expansions of coastal upwelling spots along the Brazilian coast were previously reported for Marine Isotope Stage (MIS) 5, but open questions remain regarding the climatic mechanisms and the periodicity of such changes. Based on two marine sediment cores, we provide evidence for multiple intensifica...

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Bibliographic Details
Main Authors: Lessa, Douglas Villela de Oliveira, Santos, Thiago Pereira dos, Venancio, Igor Martins, Santarosa, Ana Cláudia Aoki, Santos Junior, Edmundo C, Toledo, Felipe Antonio de L, Costa, Karen B, Albuquerque, Ana Luiza Spadano
Format: Other/Unknown Material
Language:English
Published: PANGAEA 2019
Subjects:
Milankovitch cycles
Paleoceanography
Planktonic foraminifera
Pleistocene
Southwest Atlantic Ocean
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.901799
https://doi.org/10.1594/PANGAEA.901799
Description
Summary:Expansions of coastal upwelling spots along the Brazilian coast were previously reported for Marine Isotope Stage (MIS) 5, but open questions remain regarding the climatic mechanisms and the periodicity of such changes. Based on two marine sediment cores, we provide evidence for multiple intensifications of the upwelling regime off the Southeast Brazilian margin (SBM) during several interglacials and highlight the major role of eccentricity as the responsible forcing. In addition, we show a two-step change in the upwelling regime across the Mid-Brunhes Event (MBE) and an increase in the amplitude of upwelling variability after this climatic transition. Our findings point to substantial modifications of the upwelling regions during several glacial-interglacial transitions that probably altered the regional marine productivity regime and the carbon budget.

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