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

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 anti-phase 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 two-step increase during Termination 1, synchronous with atmospheric CO2 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.

Data and Resources

This dataset has no data

Cite this as

Chiessi, Cristiano Mazur, Mulitza, Stefan, Mollenhauer, Gesine, Silva, Juliana Braga, Groeneveld, Jeroen, Prange, Matthias (2015). Dataset: 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. https://doi.org/10.1594/PANGAEA.847352

DOI retrieved: 2015

Additional Info

Field Value
Imported on November 30, 2024
Last update November 30, 2024
License CC-BY-3.0
Source https://doi.org/10.1594/PANGAEA.847352
Author Chiessi, Cristiano Mazur
Given Name Cristiano Mazur
Family Name Chiessi
More Authors
Mulitza, Stefan
Mollenhauer, Gesine
Silva, Juliana Braga
Groeneveld, Jeroen
Prange, Matthias
Source Creation 2015
Publication Year 2015
Resource Type text/tab-separated-values - filename: GeoB6211-2_Mg-Ca_SST_MAT
Subject Areas
Name: Atmosphere

Name: Lithosphere

Related Identifiers
Title: Thermal evolution of the western South Atlantic and the adjacent continent during Termination 1
Identifier: https://doi.org/10.5194/cp-11-915-2015
Type: DOI
Relation: IsSupplementTo
Year: 2015
Source: Climate of the Past
Authors: Chiessi Cristiano Mazur , Mulitza Stefan , Mollenhauer Gesine , Silva Juliana Braga , Groeneveld Jeroen , Prange Matthias .