Meridional changes in the South Atlantic Subtropical Gyre during Heinrich Stadials

Abstract Subtropical ocean gyres play a key role in modulating the global climate system redistributing energy between low and high latitudes. A poleward displacement of the subtropical gyres has been observed over the last decades, but the lack of long-term monitoring data hinders an in-depth under...

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Autores principales:	Tainã M. L. Pinho, Cristiano M. Chiessi, Rodrigo C. Portilho-Ramos, Marília C. Campos, Stefano Crivellari, Rodrigo A. Nascimento, Ana L. S. Albuquerque, André Bahr, Stefan Mulitza
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/3a39cf4c565d46b0b0e7fba585a649b2
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spelling	oai:doaj.org-article:3a39cf4c565d46b0b0e7fba585a649b22021-12-02T14:29:09ZMeridional changes in the South Atlantic Subtropical Gyre during Heinrich Stadials10.1038/s41598-021-88817-02045-2322https://doaj.org/article/3a39cf4c565d46b0b0e7fba585a649b22021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-88817-0https://doaj.org/toc/2045-2322Abstract Subtropical ocean gyres play a key role in modulating the global climate system redistributing energy between low and high latitudes. A poleward displacement of the subtropical gyres has been observed over the last decades, but the lack of long-term monitoring data hinders an in-depth understanding of their dynamics. Paleoceanographic records offer the opportunity to identify meridional changes in the subtropical gyres and investigate their consequences to the climate system. Here we use the abundance of planktonic foraminiferal species Globorotalia truncatulinodes from a sediment core collected at the northernmost boundary of the South Atlantic Subtropical Gyre (SASG) together with a previously published record of the same species from the southernmost boundary of the SASG to reconstruct meridional fluctuations of the SASG over last ca. 70 kyr. Our findings indicate southward displacements of the SASG during Heinrich Stadials (HS) 6-4 and HS1, and a contraction of the SASG during HS3 and HS2. During HS6-4 and HS1, the SASG southward displacements likely boosted the transfer of heat to the Southern Ocean, ultimately strengthening deep-water upwelling and CO2 release to the atmosphere. We hypothesize that the ongoing SASG poleward displacement may further increase oceanic CO2 release.Tainã M. L. PinhoCristiano M. ChiessiRodrigo C. Portilho-RamosMarília C. CamposStefano CrivellariRodrigo A. NascimentoAna L. S. AlbuquerqueAndré BahrStefan MulitzaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Tainã M. L. Pinho Cristiano M. Chiessi Rodrigo C. Portilho-Ramos Marília C. Campos Stefano Crivellari Rodrigo A. Nascimento Ana L. S. Albuquerque André Bahr Stefan Mulitza Meridional changes in the South Atlantic Subtropical Gyre during Heinrich Stadials
description	Abstract Subtropical ocean gyres play a key role in modulating the global climate system redistributing energy between low and high latitudes. A poleward displacement of the subtropical gyres has been observed over the last decades, but the lack of long-term monitoring data hinders an in-depth understanding of their dynamics. Paleoceanographic records offer the opportunity to identify meridional changes in the subtropical gyres and investigate their consequences to the climate system. Here we use the abundance of planktonic foraminiferal species Globorotalia truncatulinodes from a sediment core collected at the northernmost boundary of the South Atlantic Subtropical Gyre (SASG) together with a previously published record of the same species from the southernmost boundary of the SASG to reconstruct meridional fluctuations of the SASG over last ca. 70 kyr. Our findings indicate southward displacements of the SASG during Heinrich Stadials (HS) 6-4 and HS1, and a contraction of the SASG during HS3 and HS2. During HS6-4 and HS1, the SASG southward displacements likely boosted the transfer of heat to the Southern Ocean, ultimately strengthening deep-water upwelling and CO2 release to the atmosphere. We hypothesize that the ongoing SASG poleward displacement may further increase oceanic CO2 release.
format	article
author	Tainã M. L. Pinho Cristiano M. Chiessi Rodrigo C. Portilho-Ramos Marília C. Campos Stefano Crivellari Rodrigo A. Nascimento Ana L. S. Albuquerque André Bahr Stefan Mulitza
author_facet	Tainã M. L. Pinho Cristiano M. Chiessi Rodrigo C. Portilho-Ramos Marília C. Campos Stefano Crivellari Rodrigo A. Nascimento Ana L. S. Albuquerque André Bahr Stefan Mulitza
author_sort	Tainã M. L. Pinho
title	Meridional changes in the South Atlantic Subtropical Gyre during Heinrich Stadials
title_short	Meridional changes in the South Atlantic Subtropical Gyre during Heinrich Stadials
title_full	Meridional changes in the South Atlantic Subtropical Gyre during Heinrich Stadials
title_fullStr	Meridional changes in the South Atlantic Subtropical Gyre during Heinrich Stadials
title_full_unstemmed	Meridional changes in the South Atlantic Subtropical Gyre during Heinrich Stadials
title_sort	meridional changes in the south atlantic subtropical gyre during heinrich stadials
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/3a39cf4c565d46b0b0e7fba585a649b2
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Meridional changes in the South Atlantic Subtropical Gyre during Heinrich Stadials

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