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| Pàgina inicial > Articles > Articles publicats > Identification and quantification of organic aerosol from cooking and other sources in Barcelona using aerosol mass spectrometer data |
(Institut de Diagnosi Ambiental i Estudis de l'Aigua) (Institut de Diagnosi Ambiental i Estudis de l'Aigua) (Institut de Diagnosi Ambiental i Estudis de l'Aigua) (Centre de Recerca Ecològica i d'Aplicacions Forestals) (Centre de Recerca Ecològica i d'Aplicacions Forestals)| Data: | 2012 |
| Resum: | PM1 (particulate matter with an aerodynamic diameter <1 μm) non-refractory components and black carbon were measured continuously together with additional air quality and atmospheric parameters at an urban background site in Barcelona, Spain, during March 2009 (campaign DAURE, Determination of the sources of atmospheric Aerosols in Urban and Rural Environments in the western Mediterranean). Positive matrix factorization (PMF) was conducted on the organic aerosol (OA) data matrix measured by an aerosol mass spectrometer, on both unit mass(UMR) and high resolution (HR) data. Five factors or sources could be identified: LV-OOA (low-volatility oxygenated OA), related to regional, aged secondary OA; SVOOA (semi-volatile oxygenated OA), a fresher oxygenated OA; HOA (hydrocarbon-like OA, related to traffic emissions); BBOA (biomass burning OA) from domestic heating or agricultural biomass burning activities; and COA (cook-ing OA). LV-OOA contributed 28 % to OA, SV-OOA 27 %, COA 17 %, HOA 16 %, and BBOA 11 %. The COA HR spectrum contained substantial signal from oxygenated ions (O:C: 0. 21) whereas the HR HOA spectrum had almost exclusively contributions from chemically reduced ions (O:C:0. 03). If we assume that the carbon in HOA is fossil while that in COA and BBOA is modern, primary OA in Barcelona contains a surprisingly high fraction (59 %) of non-fossil car-bon. This paper presents a method for estimating cooking organic aerosol in ambient datasets based on the fractions of organic mass fragments at m/z 55 and 57: their data points fall into a V-shape in a scatter plot, with strongly influenced HOA data aligned to the right arm and strongly influenced COA data points aligned to the left arm. HR data show that this differentiation is mainly driven by the oxygen-containing ions C₃H₃O+ and C₃H₅O+, even though their contributions to m/z 55 and 57 are low compared to the reduced ions C₄H+₇ and C₄H+₉. A simple estimation method based on the markers m/z 55, 57, and 44 is developed here and allows for a first-order-estimation of COA in urban air. This study emphasizes the importance of cooking activities for ambient air quality and confirms the importance of chemical composition measurements with a high mass and time resolution. |
| Ajuts: | European Commission 610028 European Commission 036833-2 Ministerio de Ciencia e Innovación CGL2007-30502-E/CLI Ministerio de Ciencia e Innovación CGL2010-17172 Ministerio de Ciencia e Innovación CSD2008-00040 |
| 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 |
| Publicat a: | Atmospheric chemistry and physics, Vol. 12, issue 4 (Feb. 2012) , p. 1649-1665, ISSN 1680-7324 |
