Sub-micron atmospheric aerosols in the surroundings of Marseille and Athens: physical characterization and new particle formation T. Petäjä1, V.-M. Kerminen2, M. Dal Maso1, H. Junninen1, I. K. Koponen1,3, T. Hussein1,4, P. P. Aalto1, S. Andronopoulos5, D. Robin6, K. Hämeri1,7, J. G. Bartzis5,8, and M. Kulmala1 1Division of Atmospheric Sciences, Dept. of Physical Sciences, University of Helsinki, Finland 2Finnish Meteorological Institute, Climate and Global Change, Helsinki, Finland 3Department of Chemistry, University of Copenhagen, Denmark 4Dept. of Applied Environmental Sciences (ITM), Stockholm University, Stockholm, Sweden 5National Centre for Scientific Research "Demokritos", Athens, Greece 6AIRMARAIX, Marseille, France 7Finnish Institute of Occupational Health, Helsinki, Finland 8Department of Engineering and Management of Energy Resources, University of West Macedonia, Kozani, Greece
Abstract. 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.
Citation: Petäjä, T., Kerminen, V.-M., Dal Maso, M., Junninen, H., Koponen, I. K., Hussein, T., Aalto, P. P., Andronopoulos, S., Robin, D., Hämeri, K., Bartzis, J. G., and Kulmala, M.: Sub-micron atmospheric aerosols in the surroundings of Marseille and Athens: physical characterization and new particle formation, Atmos. Chem. Phys., 7, 2705-2720, doi:10.5194/acp-7-2705-2007, 2007.