Abstract
Abstract. Measurements of organic marker compounds and inorganic species were performed on PM2.5 aerosols from a Belgian forest site that is severely impacted by urban pollution ("De Inslag", Brasschaat, Belgium) during a 2007 summer period within the framework of the "Formation mechanisms, marker compounds, and source apportionment for biogenic atmospheric aerosols (BIOSOL)" project. The measured organic species included (i) low-molecular weight (MW) dicarboxylic acids (LMW DCAs), (ii) methanesulfonate (MSA), (iii) terpenoic acids originating from the oxidation of α-pinene, β-pinene, d-limonene and Δ3-carene, and (iv) organosulfates related to secondary organic aerosol from the oxidation of isoprene and α-pinene. The organic tracers explained, on average, 5.3 % of the organic carbon (OC), of which 0.7 % was due to MSA, 3.4 % to LMW DCAs, 0.6 % to organosulfates, and 0.6 % to terpenoic acids. The highest atmospheric concentrations of most species were observed during the first five days of the campaign, which were characterised by maximum day-time temperatures >22 °C. Most of the terpenoic acids and the organosulfates peaked during day-time, consistent with their local photochemical origin. High concentrations of 3-methyl-1,2,3-butanetricarboxylic acid (MBTCA) and low concentrations of cis-pinonic acid were noted during the first five days of the campaign, indicative of an aged biogenic aerosol. Several correlations between organic species were very high (r>0.85), high (0.7
Highlights
A comprehensive chemical characterisation was carried out of PM2.5 aerosols collected at a Belgian forest site (“De Inslag”, Brasschaat, Belgium) that is severely impacted by urban pollution within the frame of the “Formation mechanisms, marker compounds, and source apportionment for biogenic atmospheric aerosols (BIOSOL)” project
The measured organic species included (i) methanesulfonate (MSA), (ii) low-molecular weight (MW) dicarboxylic acids (LMW DCAs), (iii) terpenoic acids originating from the oxidation of α-pinene, β-pinene, d-limonene and 3-carene, and (iv) organosulfates related to secondary organic aerosol (SOA) from the oxidation of isoprene, α-pinene, and unsaturated fatty acids
05-Jun 06-Jun 07-Jun 08-Jun 09-Jun 10-Jun 11-Jun 12-Jun 13-Jun 14-Jun 15-Jun 16-Jun 17-Jun 18-Jun 19-Jun 20-Jun 21-Jun 22-Jun 23-Jun 24-Jun 25-Jun 26-Jun 27-Jun 28-Jun 29-Jun 30-Jun 01-Jul 02-Jul 03-Jul 04-Jul 05-Jul 06-Jul 07-Jul 08-Jul 09-Jul 10-Jul 11-Jul 12-Jul 13-Jul 14-Jul size fraction front and back filters were analysed for watersoluble OC (WSOC) with a total organic carbon analyser, as described by Viana et al (2006) and Chi (2009), and for water-soluble inorganic and organic species (i.e., MSA and LMW DCAs) by ion chromatography (IC), whereas the fine size fraction front filters were analysed for organosulfates, nitrooxy organosulfates, and terpenoic acids by liquid chromatography with negative ion electrospray ionisation mass spectrometry (LC/(–)ESI-MS)
Summary
A comprehensive chemical characterisation was carried out of PM2.5 aerosols collected at a Belgian forest site (“De Inslag”, Brasschaat, Belgium) that is severely impacted by urban pollution within the frame of the “Formation mechanisms, marker compounds, and source apportionment for biogenic atmospheric aerosols (BIOSOL)” project. The measured organic species included (i) methanesulfonate (MSA), (ii) low-molecular weight (MW) dicarboxylic acids (LMW DCAs), (iii) terpenoic acids originating from the oxidation of α-pinene, β-pinene, d-limonene and 3-carene, and (iv) organosulfates related to secondary organic aerosol (SOA) from the oxidation of isoprene, α-pinene, and unsaturated fatty acids. These species were selected for various reasons that relate to their biogenic/anthropogenic origin, formation processes (gas-phase oxidation/heterogeneous chemistry), long-range transport or local production. FFigig.u1re. 1M. aMp aopf oAf nAtnwtwereprp,, BBelggiiuumm, ,anadndsusrruorurnoduinngdsinwgitsh wthiethlotchaetiolnocoaf -the Brasschaat tion of the sBamrapslisncghsaitaetinsdaimcapteldinwgithsiatereidnadsitceraistke.d with a red asterisk
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