Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 6 5 2006 10.5194/acpd-6-8605-2006 http://www.atmos-chem-phys-discuss.net/6/8605/2006/ http://www.atmos-chem-phys-discuss.net/6/8605/2006/acpd-6-8605-2006.html http://www.atmos-chem-phys-discuss.net/6/8605/2006/acpd-6-8605-2006.pdf 8605 8647 2006-09-13 Sub-micron atmospheric aerosols in the surroundings of Marseille and Athens: physical characterization and new particle formation T. Petäjä tuukka.petaja@helsinki.fi V.-M. Kerminen M. Dal Maso H. Junninen I. K. Koponen T. Hussein P. P. Aalto S. Andronopoulos D. Robin K. Hämeri J. G. Bartzis M. Kulmala Division of Atmospheric Sciences, Dept. of Physical Sciences, University of Helsinki, Finland Finnish Meteorological Institute, Climate and Global Change, Helsinki, Finland Department of Chemistry, University of Copenhagen, Denmark Dept. of Applied Environmental Sciences (ITM), Stockholm University, Stockholm, Sweden National Centre for Scientific Research “Demokritos��?, Athens, Greece AIRMARAIX, Marseille, France Finnish Institute of Occupational Health, Helsinki, Finland Department of Engineering and Management of Energy Resources, University of West Macedonia, Kozani, Greece The properties of atmospheric aerosol particles in Marseille and Athens were investigated. The studies were performed in Marseille, France during July 2002 and in Athens Greece during June 2003. The aerosol size distribution and the formation and growth rates of newly formed particles were characterized using Differential Mobility Particle Sizers. Hygroscopic properties were observed using a Hygroscopic Tandem Differential Mobility Analyzer setup. During both campaigns, the observations were performed at suburban, almost rural sites, and the sites can be considered to show general regional background behavior depending on the wind direction. At both sites there were clear pattern for both aerosol number concentration and hygroscopic properties. Nucleation mode number concentration increased during the morning hours indicating new particle formation, which was observed during more than 30% of the days. The observed formation rate was typically more than 1 cm^−3 s^−1, and the growth rate was between 1.2–9.9 nm h^−1. Based on hygroscopicity measurements in Athens, the nucleation mode size increase was due to condensation of both water insoluble and water soluble material. However, during a period of less anthropogenic influence, the growth was to a larger extent due to water insoluble components. When urban pollution was more pronounced, growth due to condensation of water soluble material dominated.