气候变化领域集成服务门户(CCPortal): 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

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DOI	10.5194/cp-16-283-2020
	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 P.; Nicolle M.; Piot C.; Colin C.; Debret M.; Swingedouw D.; Perrette Y.; Bellingery M.-C.; Chazeau B.; Develle A.-L.; Leblanc M.; Skonieczny C.; Copard Y.; Reyss J.-L.; Malet E.; Jouffroy-Bapicot I.; Kelner M.; Poulenard J.; Didier J.; Arnaud F.; Vannière B.
发表日期	2020
ISSN	18149324
起始页码	283
结束页码	298
卷号	16 期号:1
英文摘要	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 3150calBP. 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 1070calBP. 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 1070calBP, 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 1070calBP, 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. © 2020 SPIE. All rights reserved.
语种	英语
scopus关键词	atmospheric deposition; dust; emission; intertropical convergence zone; mineral dust; North Atlantic Oscillation; palygorskite; pollutant source; reconstruction; sediment core; solar radiation; Corse; France; Mediterranean Sea; Mediterranean Sea (West); North Africa; Sahara
来源期刊	Climate of the Past
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153202
作者单位	EDYTEM, Université Savoie Mont-Blanc, Université Grenoble Alpes, CNRS, Le Bourget du Lac, France; M2C, Université de Rouen, CNRS, Rouen, France; LCME, Université Savoie Mont-Blanc, Le Bourget du Lac, France; GEOPS, CNRS-Université de Paris-Sud, Université Paris-Saclay, Orsay, France; EPOC, CNRS-Université de Bordeaux, Pessac., France; LCE, Université Aix-Marseille, CNRS, Marseille, France; Chrono-Environnement, Université de Franche-Comté, CNRS, Besançon, France; SPE, Université de Corse Pascale Paoli, CNRS, Campus Grimaldi, BP 52, Corte, 20250, France
推荐引用方式 GB/T 7714	Sabatier P.,Nicolle M.,Piot C.,et al. 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[J],2020,16(1).
APA	Sabatier P..,Nicolle M..,Piot C..,Colin C..,Debret M..,...&Vannière B..(2020).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.Climate of the Past,16(1).
MLA	Sabatier P.,et al."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".Climate of the Past 16.1(2020).