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, supplement to: Chiessi, Cristiano Mazur; Mulitza, Stefan; Mollenhauer, Gesine; Silva, Juliana Braga; Groeneveld, Jeroen; Prange, Matthias (2015): Thermal evolution of the western South Atlantic and the adjacent continent during Termination 1. Climate of the Past, 11(6), 915-929

DOI

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.

Identifier
DOI https://doi.org/10.1594/PANGAEA.847352
Related Identifier https://doi.org/10.5194/cp-11-915-2015
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.847352
Provenance
Creator Chiessi, Cristiano Mazur; Mulitza, Stefan; Mollenhauer, Gesine; Silva, Juliana Braga; Groeneveld, Jeroen; Prange, Matthias
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2015
Rights Creative Commons Attribution 3.0 Unported
OpenAccess true
Representation
Language English
Resource Type Supplementary Dataset
Format text/tab-separated-values
Size 948 data points
Discipline Earth System Research
Spatial Coverage (-50.243 LON, -32.505 LAT); Argentine Basin