ACPD Atmospheric Chemistry and Physics Discussions ACPD 1680-7375 Copernicus GmbH Göttingen, Germany 10.5194/acpd-11-19639-2011 Sources and atmospheric processing of organic aerosol in the Mediterranean: insights from aerosol mass spectrometer factor analysis Hildebrandt L. 1 Kostenidou E. 2 Lanz V. A. 3 Prevot A. S. H. 3 Baltensperger U. 3 Mihalopoulos N. 2 4 Laaksonen A. 5 6 Donahue N. M. 1 Pandis S. N. 1 2 Center for Atmospheric Particle Studies, Carnegie Mellon University, Pittsburgh, PA, USA Institute of Chemical Engineering and High Temperature Chemical Processes (ICE-HT), Foundation of Research and Technology (FORTH), Patra, Greece Laboratory of Atmospheric Chemistry, Paul Scherrer Institut, Villigen, Switzerland Environmental Chemical Processes Laboratory (ECPL), University of Crete, Heraklion, Greece Department of Applied Physics, University of Eastern Finland, Kuopio, Finland Finnish Meteorological Institute, Helsinki, Finland 11 07 2011 11 7 19639 19682 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys-discuss.net/11/19639/2011/acpd-11-19639-2011.html The full text article is available as a PDF file from http://www.atmos-chem-phys-discuss.net/11/19639/2011/acpd-11-19639-2011.pdf

Atmospheric particles were measured in the winter at a remote coastal site on the island of Crete, Greece during the Finokalia Aerosol Measurement Experiment-2009. A Quadrupole aerosol mass spectrometer (Q-AMS) was employed to quantify the size-resolved chemical composition of non-refractory submicron aerosol, and a thermodenuder was used to analyze the organic aerosol (OA) volatility. Complementary measurements included particle size distributions from a scanning mobility particle sizer, inorganic and organic particle composition from filter analysis, concentrations of O<sub>3</sub>, NO<sub>x</sub> and NO<sub>y</sub>, and meteorological measurements. Factor analysis was performed on the OA mass spectra, and the variability in OA composition could best be explained with three OA components. The oxygenated organic aerosol (OOA) was similar in composition and volatility to the summertime OA previously measured at this site and appears to represent an effective endpoint in particle-phase oxidation of organics. The two other OA components, one associated with amines (Amine-OA) and the other probably associated with the burning of olive branches (OB-OA), had lower volatility but were less oxygenated. Hydrocarbon-like organic aerosol (HOA) was not detected. The absence of OB-OA and Amine-OA in the summer data may be due to lower emissions and/or photochemical conversion of these components to OOA.

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