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Title

Variations in time and space of trace metal aerosol concentrations in urban areas and their surroundings

AuthorsMoreno, Teresa CSIC ORCID ; Querol, Xavier CSIC ORCID ; Alastuey, Andrés CSIC ORCID; Reche, Cristina CSIC ORCID; Cusack, Michael CSIC ORCID; Amato, Fulvio CSIC ORCID ; Pandolfi, Marco; Pey, Jorge ; Richard, Agnes; Prévôt, André S. H.; Furger, Markus; Gibbons, Wes
KeywordsAir quality
Particulate matter
Source contributions
Aerosols
Issue Date12-Sep-2011
PublisherCopernicus Publications
CitationAtmospheric Chemistry and Physics 11 (17): 9415-9430 (2011)
AbstractUsing an unprecedentedly large geochemical database, we compare temporal and spatial variations in inhalable trace metal background concentrations in a major city (Barcelona, Spain) and at a nearby mountainous site (Montseny) affected by the urban plume. Both sites are contaminated by technogenic metals, with V, Pb, Cu, Zn, Mn, Sn, Bi, Sb and Cd all showing upper continental crust (UCC) normalised values >1 in broadly increasing order. The highest metal concentrations usually occur during winter at Barcelona and summer in Montseny. This seasonal difference was especially marked at the remote mountain site in several elements such as Ti and Rare Earth Elements, which recorded campaign maxima, exceeding PM10 concentrations seen in Barcelona. The most common metals were Zn, Ti, Cu, Mn, Pb and V. Both V and Ni show highest concentrations in summer, and preferentially fractionate into the finest PM sizes (PM1/PM10 > 0.5) especially in Barcelona, this being attributed to regionally dispersed contamination from fuel oil combustion point sources. Within the city, hourly metal concentrations are controlled either by traffic (rush hour double peak for Cu, Sb, Sn, Ba) or industrial plumes (morning peak of Ni, Mn, Cr generated outside the city overnight), whereas at Montseny metal concentrations rise during the morning to a single, prolonged afternoon peak as contaminated air transported by the sea breeze moves into the mountains. Our exceptional database, which includes hourly measurements of chemical concentrations, demonstrates in more detail than previous studies the spatial and temporal variability of urban pollution by trace metals in a given city. Technogenic metalliferous aerosols are commonly fine in size and therefore potentially bioavailable, emphasising the case for basing urban background PM characterisation not only on physical parameters such as mass but also on sample chemistry and with special emphasis on trace metal content. © 2011 Author(s).
Publisher version (URL)https://doi.org/10.5194/acp-11-9415-2011
URIhttp://hdl.handle.net/10261/185846
DOI10.5194/acp-11-9415-2011
Appears in Collections:(IDAEA) Artículos

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