Stable oxygen isotope and Mg/Ca data of Globigerinoides ruber white, water stable oxygen isotope data, SST and MAT records of sediment core GeoB6211-2

Chiessi, Cristiano Mazur; Mulitza, Stefan; Mollenhauer, Gesine; Silva, Juliana Braga; Groeneveld, Jeroen; Prange, Matthias

doi:10.1594/pangaea.847352

2015

DOI: 10.1594/pangaea.847352

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Stable oxygen isotope and Mg/Ca data of Globigerinoides ruber white, water stable oxygen isotope data, SST and MAT records of sediment core GeoB6211-2

Cristiano Mazur Chiessi¹,

Stefan Mulitza²,

Gesine Mollenhauer³

et al.

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Thermal evolution of the western South Atlantic and the adjacent continent during Termination 1

Chiessi¹,

Mulitza

Mollenhauer

et al. 2015

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Abstract. During Termination 1, millennial-scale weakening events of the Atlantic meridional overturning circulation (AMOC) supposedly produced major changes in sea surface temperatures (SSTs) of the western South Atlantic, and in mean air temperatures (MATs) over southeastern South America. It has been suggested, for instance, that the Brazil Current (BC) would strengthen (weaken) and the North Brazil Current (NBC) would weaken (strengthen) during slowdown (speed-up) events of the AMOC. This antiphase pattern was claimed to be a necessary response to the decreased North Atlantic heat piracy during periods of weak AMOC. However, the thermal evolution of the western South Atlantic and the adjacent continent is so far largely unknown. Here we address this issue, presenting high-temporal-resolution SST and MAT records from the BC and southeastern South America, respectively. We identify a warming in the western South Atlantic during Heinrich Stadial 1 (HS1), which is followed first by a drop and then by increasing temperatures during the Bølling-Allerød, in phase with an existing SST record from the NBC. Additionally, a similar SST evolution is shown by a southernmost eastern South Atlantic record, suggesting a South Atlantic-wide pattern in SST evolution during most of Termination 1. Over southeastern South America, our MAT record shows a twostep increase during Termination 1, synchronous with atmospheric CO 2 rise (i.e., during the second half of HS1 and during the Younger Dryas), and lagging abrupt SST changes by several thousand years. This delay corroborates the notion that the long duration of HS1 was fundamental in driving the Earth out of the last glacial.

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Thermal evolution of the western South Atlantic and the adjacent continent during Termination 1

Chiessi¹,

Mulitza

Mollenhauer

et al. 2015

Clim. Past

Self Cite

View full text Add to dashboard Cite

show abstract

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Stable oxygen isotope and Mg/Ca data of Globigerinoides ruber white, water stable oxygen isotope data, SST and MAT records of sediment core GeoB6211-2

Cited by 1 publication

References 0 publications

Thermal evolution of the western South Atlantic and the adjacent continent during Termination 1

Thermal evolution of the western South Atlantic and the adjacent continent during Termination 1

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