Past African dust inputs in the western Mediterranean area controlled by the complex interaction between the Intertropical Convergence Zone, the North Atlantic Oscillation, and total solar irradiance
North Africa is the largest source of mineral dust on Earth, which has multiple impacts on the climate system; however, our understanding of decadal to centennial changes in African dust emissions over the last few millenniums is limited. Here, we present a high-resolution multiproxy analysis of sed...
Published in: | Climate of the Past |
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00050550 2023-05-15T17:32:37+02:00 Past African dust inputs in the western Mediterranean area controlled by the complex interaction between the Intertropical Convergence Zone, the North Atlantic Oscillation, and total solar irradiance Sabatier, Pierre Nicolle, Marie Piot, Christine Colin, Christophe Debret, Maxime Swingedouw, Didier Perrette, Yves Bellingery, Marie-Charlotte Chazeau, Benjamin Develle, Anne-Lise Leblanc, Maxime Skonieczny, Charlotte Copard, Yoann Reyss, Jean-Louis Malet, Emmanuel Jouffroy-Bapicot, Isabelle Kelner, Maëlle Poulenard, Jérôme Didier, Julien Arnaud, Fabien Vannière, Boris 2020-02 electronic https://doi.org/10.5194/cp-16-283-2020 https://noa.gwlb.de/receive/cop_mods_00050550 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00050208/cp-16-283-2020.pdf https://cp.copernicus.org/articles/16/283/2020/cp-16-283-2020.pdf eng eng Copernicus Publications Climate of the Past -- http://www.copernicus.org/EGU/cp/cp/published_papers.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2217985 -- 1814-9332 https://doi.org/10.5194/cp-16-283-2020 https://noa.gwlb.de/receive/cop_mods_00050550 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00050208/cp-16-283-2020.pdf https://cp.copernicus.org/articles/16/283/2020/cp-16-283-2020.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2020 ftnonlinearchiv https://doi.org/10.5194/cp-16-283-2020 2022-02-08T22:36:48Z North Africa is the largest source of mineral dust on Earth, which has multiple impacts on the climate system; however, our understanding of decadal to centennial changes in African dust emissions over the last few millenniums is limited. Here, we present a high-resolution multiproxy analysis of sediment core from high-elevation Lake Bastani, on the island of Corsica, to reconstruct past African dust inputs to the western Mediterranean area over the last 3150 cal BP. Clay mineralogy with palygorskite and a clay ratio associated with geochemical data allow us to determine that terrigenous fluxes are almost exclusively related to atmospheric dust deposition from the western Sahara and Sahel areas over this period. High-resolution geochemical contents provide a reliable proxy for Saharan dust inputs with long-term (millennial) to short-term (centennial) variations. Millennial variations have been correlated with the long-term southward migration of the Intertropical Convergence Zone (ITCZ), with an increase in dust input since 1070 cal BP. This correlation suggests a strong link with the ITCZ and could reflect the increased availability of dust sources to be mobilized with an increase in wind and a decrease in precipitation over western and North Africa. For centennial to decadal variations, wavelet analyses show that since 1070 cal BP, the North Atlantic Oscillation (NAO) has been the main climatic forcing, with an increase in Saharan dust input during the positive phase, as suggested by previous studies over the last decades. However, when the ITCZ is in a northern position, before 1070 cal BP, wavelet analyses indicate that total solar irradiance (TSI) is the main forcing factor, with an increase in African dust input during low TSI. With climate reanalysis over the instrumental era, during low TSI we observe a significant negative anomaly in pressure over Africa, which is known to increase the dust transport. These two climatic forcing factors (NAO, TSI) modulate Saharan dust inputs to the Mediterranean area at a centennial timescale through changes in wind and transport pathways. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Niedersächsisches Online-Archiv NOA Climate of the Past 16 1 283 298 |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Sabatier, Pierre Nicolle, Marie Piot, Christine Colin, Christophe Debret, Maxime Swingedouw, Didier Perrette, Yves Bellingery, Marie-Charlotte Chazeau, Benjamin Develle, Anne-Lise Leblanc, Maxime Skonieczny, Charlotte Copard, Yoann Reyss, Jean-Louis Malet, Emmanuel Jouffroy-Bapicot, Isabelle Kelner, Maëlle Poulenard, Jérôme Didier, Julien Arnaud, Fabien Vannière, Boris Past African dust inputs in the western Mediterranean area controlled by the complex interaction between the Intertropical Convergence Zone, the North Atlantic Oscillation, and total solar irradiance |
topic_facet |
article Verlagsveröffentlichung |
description |
North Africa is the largest source of mineral dust on Earth, which has multiple impacts on the climate system; however, our understanding of decadal to centennial changes in African dust emissions over the last few millenniums is limited. Here, we present a high-resolution multiproxy analysis of sediment core from high-elevation Lake Bastani, on the island of Corsica, to reconstruct past African dust inputs to the western Mediterranean area over the last 3150 cal BP. Clay mineralogy with palygorskite and a clay ratio associated with geochemical data allow us to determine that terrigenous fluxes are almost exclusively related to atmospheric dust deposition from the western Sahara and Sahel areas over this period. High-resolution geochemical contents provide a reliable proxy for Saharan dust inputs with long-term (millennial) to short-term (centennial) variations. Millennial variations have been correlated with the long-term southward migration of the Intertropical Convergence Zone (ITCZ), with an increase in dust input since 1070 cal BP. This correlation suggests a strong link with the ITCZ and could reflect the increased availability of dust sources to be mobilized with an increase in wind and a decrease in precipitation over western and North Africa. For centennial to decadal variations, wavelet analyses show that since 1070 cal BP, the North Atlantic Oscillation (NAO) has been the main climatic forcing, with an increase in Saharan dust input during the positive phase, as suggested by previous studies over the last decades. However, when the ITCZ is in a northern position, before 1070 cal BP, wavelet analyses indicate that total solar irradiance (TSI) is the main forcing factor, with an increase in African dust input during low TSI. With climate reanalysis over the instrumental era, during low TSI we observe a significant negative anomaly in pressure over Africa, which is known to increase the dust transport. These two climatic forcing factors (NAO, TSI) modulate Saharan dust inputs to the Mediterranean area at a centennial timescale through changes in wind and transport pathways. |
format |
Article in Journal/Newspaper |
author |
Sabatier, Pierre Nicolle, Marie Piot, Christine Colin, Christophe Debret, Maxime Swingedouw, Didier Perrette, Yves Bellingery, Marie-Charlotte Chazeau, Benjamin Develle, Anne-Lise Leblanc, Maxime Skonieczny, Charlotte Copard, Yoann Reyss, Jean-Louis Malet, Emmanuel Jouffroy-Bapicot, Isabelle Kelner, Maëlle Poulenard, Jérôme Didier, Julien Arnaud, Fabien Vannière, Boris |
author_facet |
Sabatier, Pierre Nicolle, Marie Piot, Christine Colin, Christophe Debret, Maxime Swingedouw, Didier Perrette, Yves Bellingery, Marie-Charlotte Chazeau, Benjamin Develle, Anne-Lise Leblanc, Maxime Skonieczny, Charlotte Copard, Yoann Reyss, Jean-Louis Malet, Emmanuel Jouffroy-Bapicot, Isabelle Kelner, Maëlle Poulenard, Jérôme Didier, Julien Arnaud, Fabien Vannière, Boris |
author_sort |
Sabatier, Pierre |
title |
Past African dust inputs in the western Mediterranean area controlled by the complex interaction between the Intertropical Convergence Zone, the North Atlantic Oscillation, and total solar irradiance |
title_short |
Past African dust inputs in the western Mediterranean area controlled by the complex interaction between the Intertropical Convergence Zone, the North Atlantic Oscillation, and total solar irradiance |
title_full |
Past African dust inputs in the western Mediterranean area controlled by the complex interaction between the Intertropical Convergence Zone, the North Atlantic Oscillation, and total solar irradiance |
title_fullStr |
Past African dust inputs in the western Mediterranean area controlled by the complex interaction between the Intertropical Convergence Zone, the North Atlantic Oscillation, and total solar irradiance |
title_full_unstemmed |
Past African dust inputs in the western Mediterranean area controlled by the complex interaction between the Intertropical Convergence Zone, the North Atlantic Oscillation, and total solar irradiance |
title_sort |
past african dust inputs in the western mediterranean area controlled by the complex interaction between the intertropical convergence zone, the north atlantic oscillation, and total solar irradiance |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/cp-16-283-2020 https://noa.gwlb.de/receive/cop_mods_00050550 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00050208/cp-16-283-2020.pdf https://cp.copernicus.org/articles/16/283/2020/cp-16-283-2020.pdf |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_relation |
Climate of the Past -- http://www.copernicus.org/EGU/cp/cp/published_papers.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2217985 -- 1814-9332 https://doi.org/10.5194/cp-16-283-2020 https://noa.gwlb.de/receive/cop_mods_00050550 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00050208/cp-16-283-2020.pdf https://cp.copernicus.org/articles/16/283/2020/cp-16-283-2020.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/cp-16-283-2020 |
container_title |
Climate of the Past |
container_volume |
16 |
container_issue |
1 |
container_start_page |
283 |
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298 |
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1766130815383633920 |