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Thermal Evolution of the Western South Atlantic and the Adjacent Continent During Termination 1 : Volume 10, Issue 6 (15/12/2014)

By Chiessi, C. M.

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Book Id: WPLBN0004006755
Format Type: PDF Article :
File Size: Pages 41
Reproduction Date: 2015

Title: Thermal Evolution of the Western South Atlantic and the Adjacent Continent During Termination 1 : Volume 10, Issue 6 (15/12/2014)  
Author: Chiessi, C. M.
Volume: Vol. 10, Issue 6
Language: English
Subject: Science, Climate, Past
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Mollenhauer, G., Silva, J. B., Mulitza, S., Prange, M., Groeneveld, J., & Chiessi, C. M. (2014). Thermal Evolution of the Western South Atlantic and the Adjacent Continent During Termination 1 : Volume 10, Issue 6 (15/12/2014). Retrieved from

Description: School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, Brazil. During Termination 1, millennial-scale weakening events of the Atlantic meridional overturning circulation (AMOC) supposedly produced major changes in sea surface temperatures (SST) of the western South Atlantic, and in mean air temperatures (MAT) over southeastern South America. It was 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 largely unknown and a compelling record of the BC-NBC anti-phase behavior remains elusive. 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 NBC record. 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 to drive the Earth out of the last glacial.

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

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