Quantifying dry and wet deposition fluxes in two Regions of contrasting African influence : the NE Iberian Peninsula and the Canary Islands
Castillo, Sonia (Institut de Diagnosi Ambiental i Estudis de l'Aigua)
Alastuey, Andrés (Institut de Diagnosi Ambiental i Estudis de l'Aigua)
Cuevas Agulló, Emilio (Instituto Nacional de Meteorología (Espanya). Observatorio Atmosférico de Izaña)
Querol Carceller, Xavier (Institut de Diagnosi Ambiental i Estudis de l'Aigua)
Àvila i Castells, Anna (Centre de Recerca Ecològica i d'Aplicacions Forestals)

Data:	2017
Resum:	This study considers the role of distance to the African source on the amount of deposition. To this end, dry and wet deposition was measured at a site close to Africa (Santa Cruz de Tenerife in the Canary Islands, SCO) and at a distant site located in NE Spain (La Castanya, Montseny, MSY). Because of the important influence of African influence on the buildup of particles in the atmosphere, we specifically addressed the contribution of North African events (NAF events) compared to other provenances (no-NAF events) in the wet and dry pathways at the two sites. At the site close to Africa, most of the crustal-derived elements were deposited in the dry mode, with NAF events contributing more than no-NAF events. Marine elements, by contrast, were mostly deposited at this site in the wet form with a predominance of no-NAF events. At MSY, wet deposition of SO4-S, NO3-N and NH4-N during NAF events was higher than at the site close to Africa, either in the wet or dry mode. This fact suggests that mineral dust interacts with pollutants, the mineral surface being coated with ammonium, sulphate and nitrate ions as the dust plume encounters polluted air masses in its way from North Africa to the Western Mediterranean. African dust may provide a mechanism of pollution scavenging and our results indicate that this removal is more effective in the wet mode at sites far away from the mineral source.
Ajuts:	Ministerio de Ciencia e Innovación CGL2009-13188-C03-01 Ministerio de Ciencia e Innovación CSD2008-00040 Ministerio de Educación y Ciencia CGL2005-07543/CLI Agència de Gestió d'Ajuts Universitaris i de Recerca 2014-SGR33
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Mineral dust ; Dry deposition ; Wet deposition ; African intrusions ; Particulate matter ; Anthropogenic pollution
Publicat a:	Atmosphere (Basel), Vol. 8, issue 5 (May 2017) , art. 86, ISSN 2073-4433

DOI: 10.3390/atmos8050086

17 p, 2.0 MB

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