155,000 Years of West African Monsoon and Ocean Thermal Evolution
A detailed reconstruction of West African monsoon hydrology over the past 155,000 years suggests a close linkage to northern high-latitude climate oscillations. Ba/Ca ratio and oxygen isotope composition of planktonic foraminifera in a marine sediment core from the Gulf of Guinea, in the eastern equ...
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American Association for the Advancement of Science (AAAS)
2007
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craaas:10.1126/science.1140461 2024-06-23T07:56:16+00:00 155,000 Years of West African Monsoon and Ocean Thermal Evolution Weldeab, Syee Lea, David W. Schneider, Ralph R. Andersen, Nils 2007 http://dx.doi.org/10.1126/science.1140461 https://www.science.org/doi/pdf/10.1126/science.1140461 en eng American Association for the Advancement of Science (AAAS) Science volume 316, issue 5829, page 1303-1307 ISSN 0036-8075 1095-9203 journal-article 2007 craaas https://doi.org/10.1126/science.1140461 2024-06-13T04:01:45Z A detailed reconstruction of West African monsoon hydrology over the past 155,000 years suggests a close linkage to northern high-latitude climate oscillations. Ba/Ca ratio and oxygen isotope composition of planktonic foraminifera in a marine sediment core from the Gulf of Guinea, in the eastern equatorial Atlantic (EEA), reveal centennial-scale variations of riverine freshwater input that are synchronous with northern high-latitude stadials and interstadials of the penultimate interglacial and the last deglaciation. EEA Mg/Ca-based sea surface temperatures (SSTs) were decoupled from northern high-latitude millennial-scale fluctuation and primarily responded to changes in atmospheric greenhouse gases and low-latitude solar insolation. The onset of enhanced monsoon precipitation lags behind the changes in EEA SSTs by up to 7000 years during glacial-interglacial transitions. This study demonstrates that the stadial-interstadial and deglacial climate instability of the northern high latitudes exerts dominant control on the West African monsoon dynamics through an atmospheric linkage. Article in Journal/Newspaper Planktonic foraminifera AAAS Resource Center (American Association for the Advancement of Science) Science 316 5829 1303 1307 |
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Open Polar |
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AAAS Resource Center (American Association for the Advancement of Science) |
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craaas |
language |
English |
description |
A detailed reconstruction of West African monsoon hydrology over the past 155,000 years suggests a close linkage to northern high-latitude climate oscillations. Ba/Ca ratio and oxygen isotope composition of planktonic foraminifera in a marine sediment core from the Gulf of Guinea, in the eastern equatorial Atlantic (EEA), reveal centennial-scale variations of riverine freshwater input that are synchronous with northern high-latitude stadials and interstadials of the penultimate interglacial and the last deglaciation. EEA Mg/Ca-based sea surface temperatures (SSTs) were decoupled from northern high-latitude millennial-scale fluctuation and primarily responded to changes in atmospheric greenhouse gases and low-latitude solar insolation. The onset of enhanced monsoon precipitation lags behind the changes in EEA SSTs by up to 7000 years during glacial-interglacial transitions. This study demonstrates that the stadial-interstadial and deglacial climate instability of the northern high latitudes exerts dominant control on the West African monsoon dynamics through an atmospheric linkage. |
format |
Article in Journal/Newspaper |
author |
Weldeab, Syee Lea, David W. Schneider, Ralph R. Andersen, Nils |
spellingShingle |
Weldeab, Syee Lea, David W. Schneider, Ralph R. Andersen, Nils 155,000 Years of West African Monsoon and Ocean Thermal Evolution |
author_facet |
Weldeab, Syee Lea, David W. Schneider, Ralph R. Andersen, Nils |
author_sort |
Weldeab, Syee |
title |
155,000 Years of West African Monsoon and Ocean Thermal Evolution |
title_short |
155,000 Years of West African Monsoon and Ocean Thermal Evolution |
title_full |
155,000 Years of West African Monsoon and Ocean Thermal Evolution |
title_fullStr |
155,000 Years of West African Monsoon and Ocean Thermal Evolution |
title_full_unstemmed |
155,000 Years of West African Monsoon and Ocean Thermal Evolution |
title_sort |
155,000 years of west african monsoon and ocean thermal evolution |
publisher |
American Association for the Advancement of Science (AAAS) |
publishDate |
2007 |
url |
http://dx.doi.org/10.1126/science.1140461 https://www.science.org/doi/pdf/10.1126/science.1140461 |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Science volume 316, issue 5829, page 1303-1307 ISSN 0036-8075 1095-9203 |
op_doi |
https://doi.org/10.1126/science.1140461 |
container_title |
Science |
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316 |
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5829 |
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1303 |
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1307 |
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1802649261327777792 |