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Soluble iron dust export in the high altitude Saharan Air Layer
Title: Soluble iron dust export in the high altitude Saharan Air Layer
Authors: Ravelo Pérez, Lidia MaríaRodríguez González, Sergio ORCID RESEARCHERID Autor AEMETGalindo, LuisGarcía, María IsabelAutor AEMETAlastuey, AndrésLópez Solano, Javier ORCID RESEARCHERID Autor AEMET
Keywords: Dust; Iron solubility; Fractional iron solubility; Fractional iron solubility
Issue Date: 2016
Publisher: Elsevier
Citation: Atmospheric Environment. 2016, 133, p. 49-59
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Abstract: Every summer huge amounts of desert dust particles are exported from the hyperarid subtropical Sahara to the North Atlantic the so-called Saharan Air Layer (SAL), a dry, warm and dust-laden corridor that expands from the North African coast (1-5 km.a.s.I.) to the Americas above the marine boundary layer. Because of the potential impact of the dust deposited on the ocean on marine biogeochemistry and climate, we studied the Fe solubility (in seawater) of atmospheric aerosols samples directly collected in the SAL off the North African coast, i.e, the fresh aerosols recently exported from the Sahara in the SAL. The aerosol sampling was performed at 2400 m.a.s.l. in Izana observatory in Tenerife island. In the total aerosols, we found low Fe concentrations and high fractional Fe solubility (FFS-2%) in the North Atlantic free troposphere airflows and high Fe concentrations and low FFS (-0.7%) within the SAL; the resulting FFS versus total dust (or total Fe) plot shows a hyperbolic trend attributed to the conservative mixing of 'fine combustion aerosols' and 'lithogenic mineral dust'. We then focused on the soluble Fe in the SAL Our results indicate that 70% of soluble Fe is associated with the dissolution of submicron dust particles, probably involving Fe-bearing clays. We found a FFS of submicron dust (-6%) higher than that typically observed in submicron particles of soil dust samples (<1%).
Sponsorship : This study is part of the project AEROATLAN e 2015-66229 -, funded by the Ministry of Economy and Competitiveness of Spain. M.I. García holds a research grant e TESIS20120054 e co-funded by the Canarian Agency for Research, Innovation and Information Society and the European Social Fund.
ISSN: 1352-2310
Appears in Collections:Artículos científicos 2015-2018

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