A new perspective on West African hydroclimate during the last deglaciation
Widespread drought characterized the Heinrich 1 and Younger Dryas cold periods of the last deglaciation throughout much of Africa, causing large increases in dust emissions from the Sahara and Sahel. At the same time, increases in wind strength may have also contributed to dust flux, making it diffi...
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ftarchimer:oai:archimer.ifremer.fr:53223 2023-05-15T18:00:59+02:00 A new perspective on West African hydroclimate during the last deglaciation Parker, Andrew O. Schmidt, Matthew W. Jobe, Zane R. Slowey, Niall C. 2016-09 application/pdf https://archimer.ifremer.fr/doc/00421/53223/54803.pdf https://archimer.ifremer.fr/doc/00421/53223/54805.pdf https://doi.org/10.1016/j.epsl.2016.05.038 https://archimer.ifremer.fr/doc/00421/53223/ eng eng Elsevier Science Bv https://archimer.ifremer.fr/doc/00421/53223/54803.pdf https://archimer.ifremer.fr/doc/00421/53223/54805.pdf doi:10.1016/j.epsl.2016.05.038 https://archimer.ifremer.fr/doc/00421/53223/ 2016 Elsevier B.V. All rights reserved. info:eu-repo/semantics/openAccess restricted use Earth And Planetary Science Letters (0012-821X) (Elsevier Science Bv), 2016-09 , Vol. 449 , P. 79-88 West African Monsoon African humid period deglacial climate foraminiferal geochemistry X-ray fluorescence text Publication info:eu-repo/semantics/article 2016 ftarchimer https://doi.org/10.1016/j.epsl.2016.05.038 2021-09-23T20:30:28Z Widespread drought characterized the Heinrich 1 and Younger Dryas cold periods of the last deglaciation throughout much of Africa, causing large increases in dust emissions from the Sahara and Sahel. At the same time, increases in wind strength may have also contributed to dust flux, making it difficult to interpret dust records alone as reflecting changes in rainfall over the region. The Niger River has the third largest drainage basin in Africa and drains most of the Sahara and Sahel and thus preserves and propagates climatic signals. Here, we present new reconstructions of Niger Delta sea surface salinity and Niger River discharge for the last 20,000 years in order to more accurately reconstruct the onset of the Western African Monsoon system. Based on calculated delta O-18(SEAWATER) (delta O-18(SW)) and measured Ba/Ca ratios in planktonic foraminifera, these new records reflect changes in sub-Saharan precipitation across the Niger River Basin in West Africa and reveal that the West African Monsoon system began to intensify several thousand years after the equatorial Monsoon system in Central Africa. We also present new records of primary productivity in the Niger Delta that are related to wind-driven upwelling and show that productivity is decoupled from changes in Niger River discharge. Our results suggest that wind strength, rather than changes in monsoon moisture, was the primary driver of dust emissions from the Sahara and Sahel across the last deglaciation. Article in Journal/Newspaper Planktonic foraminifera Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Earth and Planetary Science Letters 449 79 88 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
West African Monsoon African humid period deglacial climate foraminiferal geochemistry X-ray fluorescence |
spellingShingle |
West African Monsoon African humid period deglacial climate foraminiferal geochemistry X-ray fluorescence Parker, Andrew O. Schmidt, Matthew W. Jobe, Zane R. Slowey, Niall C. A new perspective on West African hydroclimate during the last deglaciation |
topic_facet |
West African Monsoon African humid period deglacial climate foraminiferal geochemistry X-ray fluorescence |
description |
Widespread drought characterized the Heinrich 1 and Younger Dryas cold periods of the last deglaciation throughout much of Africa, causing large increases in dust emissions from the Sahara and Sahel. At the same time, increases in wind strength may have also contributed to dust flux, making it difficult to interpret dust records alone as reflecting changes in rainfall over the region. The Niger River has the third largest drainage basin in Africa and drains most of the Sahara and Sahel and thus preserves and propagates climatic signals. Here, we present new reconstructions of Niger Delta sea surface salinity and Niger River discharge for the last 20,000 years in order to more accurately reconstruct the onset of the Western African Monsoon system. Based on calculated delta O-18(SEAWATER) (delta O-18(SW)) and measured Ba/Ca ratios in planktonic foraminifera, these new records reflect changes in sub-Saharan precipitation across the Niger River Basin in West Africa and reveal that the West African Monsoon system began to intensify several thousand years after the equatorial Monsoon system in Central Africa. We also present new records of primary productivity in the Niger Delta that are related to wind-driven upwelling and show that productivity is decoupled from changes in Niger River discharge. Our results suggest that wind strength, rather than changes in monsoon moisture, was the primary driver of dust emissions from the Sahara and Sahel across the last deglaciation. |
format |
Article in Journal/Newspaper |
author |
Parker, Andrew O. Schmidt, Matthew W. Jobe, Zane R. Slowey, Niall C. |
author_facet |
Parker, Andrew O. Schmidt, Matthew W. Jobe, Zane R. Slowey, Niall C. |
author_sort |
Parker, Andrew O. |
title |
A new perspective on West African hydroclimate during the last deglaciation |
title_short |
A new perspective on West African hydroclimate during the last deglaciation |
title_full |
A new perspective on West African hydroclimate during the last deglaciation |
title_fullStr |
A new perspective on West African hydroclimate during the last deglaciation |
title_full_unstemmed |
A new perspective on West African hydroclimate during the last deglaciation |
title_sort |
new perspective on west african hydroclimate during the last deglaciation |
publisher |
Elsevier Science Bv |
publishDate |
2016 |
url |
https://archimer.ifremer.fr/doc/00421/53223/54803.pdf https://archimer.ifremer.fr/doc/00421/53223/54805.pdf https://doi.org/10.1016/j.epsl.2016.05.038 https://archimer.ifremer.fr/doc/00421/53223/ |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Earth And Planetary Science Letters (0012-821X) (Elsevier Science Bv), 2016-09 , Vol. 449 , P. 79-88 |
op_relation |
https://archimer.ifremer.fr/doc/00421/53223/54803.pdf https://archimer.ifremer.fr/doc/00421/53223/54805.pdf doi:10.1016/j.epsl.2016.05.038 https://archimer.ifremer.fr/doc/00421/53223/ |
op_rights |
2016 Elsevier B.V. All rights reserved. info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1016/j.epsl.2016.05.038 |
container_title |
Earth and Planetary Science Letters |
container_volume |
449 |
container_start_page |
79 |
op_container_end_page |
88 |
_version_ |
1766170280221212672 |