Authors:	Kampf, Christopher Johannes Corrigan, Ashley L. Johnson, A. M. Song, W. Keronen, P. Königstedt, Rainer Williams, Jonathan Russell, L. M. Petäjä, T. Fischer, H. Hoffmann, Thorsten
Title:	First measurements of reactive α-dicarbonyl concentrations on PM<sub>2.5</sub> aerosol over the Boreal forest in Finland during HUMPPA-COPEC 2010 - source apportionment and links to aerosol aging
Online publication date:	4-Oct-2022
Year of first publication:	2012
Language:	english
Abstract:	The first dataset for summertime boreal forest concentrations of two atmospherically relevant α-dicarbonyl compounds, glyoxal (Gly) and methylglyoxal (Mgly) on PM<sub>2.5</sub> aerosol was obtained during the HUMPPA-COPEC-2010 field measurement intensive in Hyytiälä, Finland. Anthropogenic influences over the course of the campaign were identified using trace gas signatures and aerosol particle chemical composition analysis. The data evaluation allowed the identification of different events such as urban pollution plumes, biomass burning and sawmill emissions as sources of high Gly and Mgly concentrations. Mean aerosol concentrations during periods of biogenic influence were 0.81 ng m<sup>−3</sup> for Gly and 0.31 ng m<sup>−3</sup> for Mgly. Mgly was generally less abundant in PM<sub>2.5</sub>, probably due to its shorter photolysis lifetime and less effective partitioning into the particle phase due to its smaller effective Henry's Law constant compared to Gly. This is in contrast with previous urban studies which show significantly more Mgly than Gly. Peak concentrations for Gly coincided with nearby sources, e.g. high VOC emissions from nearby sawmills, urban pollution plumes from the city of Tampere located 50 km southwest of the sampling site and biomass burning emissions from wildfires. Calculated ratios of Gly in PM<sub>2.5</sub> and total organic matter in PM1 aerosols indicate higher values in less aged aerosols. Irreversible processing of Gly in the particle phase, e.g. via oxidation by OH radicals, organo sulfate or imidazole formation are processes currently discussed in the literature which could likely explain these findings.
DDC:	540 Chemie 540 Chemistry and allied sciences
Institution:	Johannes Gutenberg-Universität Mainz
Department:	FB 09 Chemie, Pharmazie u. Geowissensch.
Place:	Mainz
ROR:	https://ror.org/023b0x485
DOI:	http://doi.org/10.25358/openscience-7796
Version:	Published version
Publication type:	Zeitschriftenaufsatz
License:	CC BY
Information on rights of use:	https://creativecommons.org/licenses/by/3.0/
Journal:	Atmospheric chemistry and physics 12 14
Pages or article number:	6145 6155
Publisher:	European Geosciences Union
Publisher place:	Katlenburg-Lindau
Issue date:	2012
ISSN:	1680-7324 1680-7316
Publisher URL:	http://dx.doi.org/10.5194/acp-12-6145-2012
Publisher DOI:	10.5194/acp-12-6145-2012
Appears in collections:	DFG-OA-Publizieren (2012 - 2017)