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...
Published in: | Scientific Reports |
---|---|
Main Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Nature Portfolio
2017
|
Subjects: | |
Online Access: | https://doi.org/10.1038/s41598-017-01629-z https://doaj.org/article/95b00e3c98334b448222f6fde6915fda |
id |
ftdoajarticles:oai:doaj.org/article:95b00e3c98334b448222f6fde6915fda |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:95b00e3c98334b448222f6fde6915fda 2023-05-15T18:00:55+02:00 Coupling of equatorial Atlantic surface stratification to glacial shifts in the tropical rainbelt R. C. Portilho-Ramos C. M. Chiessi Y. Zhang S. Mulitza M. Kucera M. Siccha M. Prange A. Paul 2017-05-01T00:00:00Z https://doi.org/10.1038/s41598-017-01629-z https://doaj.org/article/95b00e3c98334b448222f6fde6915fda EN eng Nature Portfolio https://doi.org/10.1038/s41598-017-01629-z https://doaj.org/toc/2045-2322 doi:10.1038/s41598-017-01629-z 2045-2322 https://doaj.org/article/95b00e3c98334b448222f6fde6915fda Scientific Reports, Vol 7, Iss 1, Pp 1-8 (2017) Medicine R Science Q article 2017 ftdoajarticles https://doi.org/10.1038/s41598-017-01629-z 2022-12-31T05:18:39Z 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. Article in Journal/Newspaper Planktonic foraminifera Directory of Open Access Journals: DOAJ Articles Scientific Reports 7 1 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
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 |
topic_facet |
Medicine R Science Q |
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 in Journal/Newspaper |
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://doi.org/10.1038/s41598-017-01629-z https://doaj.org/article/95b00e3c98334b448222f6fde6915fda |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Scientific Reports, Vol 7, Iss 1, Pp 1-8 (2017) |
op_relation |
https://doi.org/10.1038/s41598-017-01629-z https://doaj.org/toc/2045-2322 doi:10.1038/s41598-017-01629-z 2045-2322 https://doaj.org/article/95b00e3c98334b448222f6fde6915fda |
op_doi |
https://doi.org/10.1038/s41598-017-01629-z |
container_title |
Scientific Reports |
container_volume |
7 |
container_issue |
1 |
_version_ |
1766170199898193920 |