Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 8 20 2008 10.5194/acp-8-6281-2008 http://www.atmos-chem-phys.net/8/6281/2008/ http://www.atmos-chem-phys.net/8/6281/2008/acp-8-6281-2008.html http://www.atmos-chem-phys.net/8/6281/2008/acp-8-6281-2008.pdf 6281 6295 2008-10-29 Sources of organic carbon in fine particulate matter in northern European urban air S. Saarikoski sanna.saarikoski@fmi.fi H. Timonen K. Saarnio M. Aurela L. Järvi P. Keronen V.-M. Kerminen R. Hillamo Finnish Meteorological Institute, Air Quality, P.O. Box 503, FI-00101 Helsinki, Finland University of Helsinki, Department of Physics, P.O. Box 64, 00014 University of Helsinki, Finland A major fraction of fine particle matter consists of organic carbon (OC) but its origin is still inadequately known. In this study the sources of OC were investigated in the northern European urban environment in Helsinki, Finland. Measurements were carried out over one year and they included both filter (PM₁) and online methods. From the filter samples OC, elemental carbon (EC), water-soluble OC (WSOC), levoglucosan and major ions were analyzed. Filter data together with the concentrations of inorganic gases were analyzed by Positive matrix factorization (PMF) in order to find the sources of OC (and WSOC) on an annual as well as on a seasonal basis. In order to study the diurnal variation of sources, OC and EC were measured by a semicontinuous OC/EC analyzer and major ions were determined by a Particle-into-Liquid Sampler coupled to ion chromatographs. According to PMF, OC concentrations were impacted by four sources: biomass combustion, traffic, long-range transport and secondary production. On an annual basis the OC concentration was dominated by secondary organic aerosol (SOA). 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