Coupling of equatorial Atlantic surface stratification to glacial shifts in the tropical rainbelt

Abstract The modern state of the Atlantic meridional overturning circulation promotes a northerly maximum of tropical rainfall associated with the Intertropical Convergence Zone (ITCZ). For continental regions, abrupt millennial–scale meridional shifts of this rainbelt are well documented, but the b...

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Autores principales:	R. C. Portilho-Ramos, C. M. Chiessi, Y. Zhang, S. Mulitza, M. Kucera, M. Siccha, M. Prange, A. Paul
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/95b00e3c98334b448222f6fde6915fda
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spelling	oai:doaj.org-article:95b00e3c98334b448222f6fde6915fda2021-12-02T11:50:56ZCoupling of equatorial Atlantic surface stratification to glacial shifts in the tropical rainbelt10.1038/s41598-017-01629-z2045-2322https://doaj.org/article/95b00e3c98334b448222f6fde6915fda2017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-01629-zhttps://doaj.org/toc/2045-2322Abstract The modern state of the Atlantic meridional overturning circulation promotes a northerly maximum of tropical rainfall associated with the Intertropical Convergence Zone (ITCZ). For continental regions, abrupt millennial–scale meridional shifts of this rainbelt are well documented, but the behavior of its oceanic counterpart is unclear due the lack of a robust proxy and high temporal resolution records. Here we show that the Atlantic ITCZ leaves a distinct signature in planktonic foraminifera assemblages. We applied this proxy to investigate the history of the Atlantic ITCZ for the last 30,000 years based on two high temporal resolution records from the western Atlantic Ocean. Our reconstruction indicates that the shallowest mixed layer associated with the Atlantic ITCZ unambiguously shifted meridionally in response to changes in the strength of the Atlantic meridional overturning with a southward displacement during Heinrich Stadials 2–1 and the Younger Dryas. We conclude that the Atlantic ITCZ was located at ca. 1°S (ca. 5° to the south of its modern annual mean position) during Heinrich Stadial 1. This supports a previous hypothesis, which postulates a southern hemisphere position of the oceanic ITCZ during climatic states with substantially reduced or absent cross-equatorial oceanic meridional heat transport.R. C. Portilho-RamosC. M. ChiessiY. ZhangS. MulitzaM. KuceraM. SicchaM. PrangeA. PaulNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q R. C. Portilho-Ramos C. M. Chiessi Y. Zhang S. Mulitza M. Kucera M. Siccha M. Prange A. Paul Coupling of equatorial Atlantic surface stratification to glacial shifts in the tropical rainbelt
description	Abstract The modern state of the Atlantic meridional overturning circulation promotes a northerly maximum of tropical rainfall associated with the Intertropical Convergence Zone (ITCZ). For continental regions, abrupt millennial–scale meridional shifts of this rainbelt are well documented, but the behavior of its oceanic counterpart is unclear due the lack of a robust proxy and high temporal resolution records. Here we show that the Atlantic ITCZ leaves a distinct signature in planktonic foraminifera assemblages. We applied this proxy to investigate the history of the Atlantic ITCZ for the last 30,000 years based on two high temporal resolution records from the western Atlantic Ocean. Our reconstruction indicates that the shallowest mixed layer associated with the Atlantic ITCZ unambiguously shifted meridionally in response to changes in the strength of the Atlantic meridional overturning with a southward displacement during Heinrich Stadials 2–1 and the Younger Dryas. We conclude that the Atlantic ITCZ was located at ca. 1°S (ca. 5° to the south of its modern annual mean position) during Heinrich Stadial 1. This supports a previous hypothesis, which postulates a southern hemisphere position of the oceanic ITCZ during climatic states with substantially reduced or absent cross-equatorial oceanic meridional heat transport.
format	article
author	R. C. Portilho-Ramos C. M. Chiessi Y. Zhang S. Mulitza M. Kucera M. Siccha M. Prange A. Paul
author_facet	R. C. Portilho-Ramos C. M. Chiessi Y. Zhang S. Mulitza M. Kucera M. Siccha M. Prange A. Paul
author_sort	R. C. Portilho-Ramos
title	Coupling of equatorial Atlantic surface stratification to glacial shifts in the tropical rainbelt
title_short	Coupling of equatorial Atlantic surface stratification to glacial shifts in the tropical rainbelt
title_full	Coupling of equatorial Atlantic surface stratification to glacial shifts in the tropical rainbelt
title_fullStr	Coupling of equatorial Atlantic surface stratification to glacial shifts in the tropical rainbelt
title_full_unstemmed	Coupling of equatorial Atlantic surface stratification to glacial shifts in the tropical rainbelt
title_sort	coupling of equatorial atlantic surface stratification to glacial shifts in the tropical rainbelt
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/95b00e3c98334b448222f6fde6915fda
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Coupling of equatorial Atlantic surface stratification to glacial shifts in the tropical rainbelt

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