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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fttriple:oai:gotriple.eu:10670/1.3gu52f 2023-05-15T18:00:58+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. https://doi.org/10.1016/j.epsl.2016.05.038 https://archimer.ifremer.fr/doc/00421/53223/54803.pdf https://archimer.ifremer.fr/doc/00421/53223/54805.pdf https://archimer.ifremer.fr/doc/00421/53223/ en eng Elsevier Science Bv doi:10.1016/j.epsl.2016.05.038 10670/1.3gu52f https://archimer.ifremer.fr/doc/00421/53223/54803.pdf https://archimer.ifremer.fr/doc/00421/53223/54805.pdf https://archimer.ifremer.fr/doc/00421/53223/ other Archimer, archive institutionnelle de l'Ifremer Earth And Planetary Science Letters (0012-821X) (Elsevier Science Bv), 2016-09 , Vol. 449 , P. 79-88 envir geo Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ fttriple https://doi.org/10.1016/j.epsl.2016.05.038 2023-01-22T17:55:37Z 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. Text Planktonic foraminifera Unknown Earth and Planetary Science Letters 449 79 88 |
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envir geo 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 |
envir geo |
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 |
Text |
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 |
url |
https://doi.org/10.1016/j.epsl.2016.05.038 https://archimer.ifremer.fr/doc/00421/53223/54803.pdf https://archimer.ifremer.fr/doc/00421/53223/54805.pdf https://archimer.ifremer.fr/doc/00421/53223/ |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Archimer, archive institutionnelle de l'Ifremer Earth And Planetary Science Letters (0012-821X) (Elsevier Science Bv), 2016-09 , Vol. 449 , P. 79-88 |
op_relation |
doi:10.1016/j.epsl.2016.05.038 10670/1.3gu52f https://archimer.ifremer.fr/doc/00421/53223/54803.pdf https://archimer.ifremer.fr/doc/00421/53223/54805.pdf https://archimer.ifremer.fr/doc/00421/53223/ |
op_rights |
other |
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 |
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1766170268800122880 |