title: Organic speciation of atmospheric particles in Alvão Natural Park (Portugal).
abstract: PM(10) continental rural background aerosols were collected during a summer field campaign (August-September 2006) at Lamas de Olo in the upper zone of the Alvão Natural Park, a mountain region of northern Portugal. In addition to the determination of the carbonaceous content by a thermal-optical method, the organic speciation of aerosols was performed by gas chromatography-mass spectrometry in an effort to evaluate photo-oxidation products of biogenic volatile organic compounds and other markers for source characterization. The detailed analysis revealed relatively high concentrations of polyols and short-chain dicarboxylic, tricarboxylic, hydroxycarboxylic, and oxocarboxylic acids, many of which are thought to be indicators of secondary aerosol formation, accounting for about 70% of global chromatographically resolved mass. Major photo-oxidation products of alpha- and beta-pinene have been detected. The tracers for the photo-oxidation of isoprene comprise two diastereoisomeric 2-methyltetrols, C(5)-alkene triols, and 2-methylglyceric acid, which have only recently been elucidated. In addition, the occurrence of levoglucosan and other biomass combustion tracers indicates that the site was affected by wildfires. This source contributed to more than 80% of the organic carbon mass during a period of strong forest fire influence.
authors.affiliation: Centre for Environmental and Marine Studies (CESAM), University of Aveiro, Aveiro, Portugal. celia.alves@ua.pt
authors.forename: Célia Anjos
authors.initials: CA
authors.lastname: Alves
authors.forename: Cátia
authors.initials: C
authors.lastname: Gonçalves
authors.forename: Fátima
authors.initials: F
authors.lastname: Mirante
authors.forename: Teresa
authors.initials: T
authors.lastname: Nunes
authors.forename: Margarita
authors.initials: M
authors.lastname: Evtyugina
authors.forename: Ana
authors.initials: A
authors.lastname: Sánchez de la Campa
authors.forename: Ana C
authors.initials: AC
authors.lastname: Rocha
authors.forename: Margarida Correia
authors.initials: MC
authors.lastname: Marques
mesh_terms: D000336:Aerosols / Q000032:analysis / Q000737:chemistry; D000393:Air Pollutants / Q000032:analysis* / Q000737:chemistry; D001272:Atmosphere / Q000737:chemistry*; D004784:Environmental Monitoring; D052638:Particulate Matter / Q000032:analysis* / Q000737:chemistry; D011174:Portugal
chemical_list: D000336:Aerosols; D000393:Air Pollutants; D052638:Particulate Matter
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