气候变化领域集成服务门户(CCPortal): Major Element Signatures of Silicate Dust Deposited on the West African Margin: Links With Transport Patterns and Provenance Regions

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DOI	10.1029/2021JD035030
	Major Element Signatures of Silicate Dust Deposited on the West African Margin: Links With Transport Patterns and Provenance Regions
	Le Quilleuc M.; Bory A.J.-M.; Philippe S.; Derimian Y.; Skonieczny C.; Petit J.-E.; Ponlevé D.; Diallo A.; Ndiaye T.; Alaimo V.; Louis Q.; Tribovillard N.; Bout-Roumazeilles V.
发表日期	2021
ISSN	2169-897X
卷号	126 期号:20
英文摘要	Mineral dust deposition characteristics are poorly constrained, even in the Northeastern Tropical Atlantic Ocean, which is immediately downwind of the Saharan desert and the largest marine repository of aeolian dust in the world. Here, we report on a 2-year (March 2013–February 2015) time series of deposited dust on the Senegalese margin. This record enables us to document the chemical variability (major elements) of the settling Saharan dust (<30 µm silicate fraction, i.e., carbonate-free) at a resolution varying from one week to one day, along with the deposition flux. This continuous time series reveals a greater geochemical diversity than previously reported, particularly during the dry winter-spring season when continental trade winds sweep across vast regions of West Africa at low atmospheric levels before reaching the sampling site. By contrast, during major deposition events, which make up for most of the yearly flux, our record shows that Saharan dust chemical composition displays much narrower ranges. Trajectory analyses indicate that these relatively well-defined chemical signatures are due to the limited number of provenance sectors involved during major deposition occurrences. The chemical characterization of the dust deposited during these events, hence, allows identifying the major element fingerprint of the related source regions, the most important one being a sizable area at the border of Algeria and Mali including the Tanezrouft desert north of the Taoudeni basin. Also, since these major events are associated with major Saharan outbreaks, they provide estimations of the prevailing elemental signatures for Saharan dust impacting the Northeastern Tropical Atlantic Ocean. © 2021. American Geophysical Union. All Rights Reserved.
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/236936
作者单位	Université de Lille, CNRS, Université du Littoral Côte d’Opale, UMR 8187 - LOG - Laboratoire d’Océanologie et de Géosciences, Lille, France; Université de Lille, CNRS, UMR 8518 - LOA - Laboratoire d’Optique Atmosphérique, Lille, France; Université Paris-Saclay, CNRS, GEOPS, Orsay, France; Laboratoire des Sciences du Climat et de l’Environnement, UMR 8212, Gif-sur-Yvette, France; IRD, US 191, IMAGO, Dakar, Senegal; Université de Lille, CNRS, UMR 8516 - LASIRE - LAboratoire de Spectroscopie pour les Interactions, la Réactivité et l’Environnement, Lille, France
推荐引用方式 GB/T 7714	Le Quilleuc M.,Bory A.J.-M.,Philippe S.,et al. Major Element Signatures of Silicate Dust Deposited on the West African Margin: Links With Transport Patterns and Provenance Regions[J],2021,126(20).
APA	Le Quilleuc M..,Bory A.J.-M..,Philippe S..,Derimian Y..,Skonieczny C..,...&Bout-Roumazeilles V..(2021).Major Element Signatures of Silicate Dust Deposited on the West African Margin: Links With Transport Patterns and Provenance Regions.Journal of Geophysical Research: Atmospheres,126(20).
MLA	Le Quilleuc M.,et al."Major Element Signatures of Silicate Dust Deposited on the West African Margin: Links With Transport Patterns and Provenance Regions".Journal of Geophysical Research: Atmospheres 126.20(2021).