Abstract
Here, we present two high temporal resolution Holocene sea surface temperature (SST) and salinity (SSS) reconstructions for the SW Atlantic. Mg/Ca data together with the oxygen isotopic composition (δ18O) of a shallow dwelling planktonic foraminifera species (Globigerinoides ruber (pink)). Two marine sediment cores collected at ~ 25°S are used to assess mid- to late Holocene sea surface hydrographic conditions in the continental shelf of the South Brazilian Bight. Our results show multi-centennial-scale changes of up to 2.7 °C in SST and 0.8‰ in ice volume corrected seawater δ18O (a proxy for SSS, indicating changes of up to 2 salinity units). In phase, multicentennial-scale negative SST and SSS incursions were interpreted to indicate shelf-break upwelling events and the northward intrusion of the Plata Plume Water (PPW) under a strengthened Brazil Current (BC) flow. The latitudinal SST gradient between our two records (ΔSST7616–7610), applied here as a proxy for the BC strength, supports the existing hypothesis of antiphase between the BC and the North Brazil Current strength during the last 7 ka. Positive ΔSST7616–7610 values suggest the presence of the PPW at latitudes of up to 25.5°S, while negative ΔSST7616–7610 values (centred at around 5.4, 4.3, 2.2 and 1.3 cal ka BP) occurring synchronously with cold events in the Northern Hemisphere suggests that the Atlantic Meridional Overturning Circulation played a central role in the SW Atlantic mid- to late Holocene surface hydrographic conditions.
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Acknowledgements
The authors want to acknowledge Dr. Stefan Mulitza for his collaboration in data acquisition and discussion. The authors also wish to thank Dr. Marcelo Rodrigues, Dr. Samara Cazzoli Y Goya, Mr. Clodoaldo Vieira Tolentino and Mr. Edilson Faria for their help in sediment sampling. Thanks are due also to the crew of the R.V. ‘Prof. W. Besnard’. This work has been financially supported by Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP Proc. No. 2009/01594-6, 2010/09983-9 and 2012/17517-3).
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Nagai, R.H., Chiessi, C.M., Kuhnert, H. et al. South Brazilian Bight mid- to late Holocene hydrographic fluctuations. Geo-Mar Lett 40, 1045–1055 (2020). https://doi.org/10.1007/s00367-019-00616-9
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DOI: https://doi.org/10.1007/s00367-019-00616-9