UK'37, TEX86 and LDI indices, and temperature estimates for sediment core NAP 63-1 (South Brazil Bight), supplement to: Dauner, Ana Lúcia Lindroth; Mollenhauer, Gesine; Bícego, Márcia Caruso; de Souza, Mihael Machado; Nagai, Renata Hanae; Figueira, Rubens César Lopes; Mahiques, Michel Michaelovit... (original) (raw)

2013

Abstract

Millennial-scale oscillations are known to be important in the climatic evolution of the Atlantic basin, but which internal processes originates these oscillations are still uncertain. In this study, we investigated how the Greenland and Antarctic climates affect the SW Atlantic through basin-wide oceanographic features (such as the NADW formation and the Agulhas leakage). We reconstructed sea surface and subsurface temperatures (SST and subT) using three lipid-based biomarker proxies (UK'37, TEX86 and LDI indexes) from a sediment core (NAP 63-1) retrieved from the SW Atlantic slope (24.8°S, 44.3°W). This location permitted to evaluate the temperature oscillations of the Brazil Current without any terrigenous or upwelling-derived biases. Both TEX86-based and LDI-based estimates represent the mean annual SST, while the UK'37-based estimates represent the subT (around 30 m water depth). The periods with the most well-mixed water column were observed during intervals of cooling...

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