Aerosol sources and their contribution to the chemical composition of aerosols in the Eastern Mediterranean Sea during summertime J. Sciare1, H. Bardouki2, C. Moulin1, and N. Mihalopoulos2 1LSCE, Orme des Merisiers, Bat 709, CE Saclay, 91191 Gif-sur-Yvette Cedex, France 2Environmental Chemical Processes Laboratory, Department of Chemistry, University of Crete, P.O. Box 1470, 71409 Heraklion, Greece
Abstract. A detailed study on the temporal variability of compounds important in controlling
aerosol chemical composition was performed during a one-month experiment conducted
during summer 2000 at a background site on Crete, in the Eastern Mediterranean Sea.
Contribution of different aerosol sources in the Eastern Mediterranean Basin could be
investigated at this location since the site is influenced by a wide range of air masses
originating mainly in Europe and Africa. Chemical apportionment was performed for
various air mass origins and showed a strong impact of anthropogenic emissions in the
Turkey and Central Europe sectors, with black carbon (BC) and non-sea-salt sulfate
(nss-SO4) concentrations higher than observed in the Eastern and Western Europe sectors.
High levels of non-sea-salt calcium (nss-Ca) were associated with air masses from Africa
but also from Central Turkey. Evidence was found that BC calculation based on light
absorbance during dust events was biased.
This quality-controlled high temporal resolution dataset allowed to investigate in detail
the source-receptor relationships responsible for the levels of BC, nss-SO4 and sulfur
dioxide (SO2), observed in Crete. Among the results obtained from this model, the major
contribution of Turkey and Central Europe was confirmed in terms of anthropogenic
emissions. Comparisons with remote optical properties obtained from Satellite
observations (SEAWIFS) north of Crete indicates that our ground based aerosol
characterization was suitable for describing aerosol properties in the atmospheric column
for most of the time during the campaign.
Citation: Sciare, J., Bardouki, H., Moulin, C., and Mihalopoulos, N.: Aerosol sources and their contribution to the chemical composition of aerosols in the Eastern Mediterranean Sea during summertime, Atmos. Chem. Phys., 3, 291-302, doi:10.5194/acp-3-291-2003, 2003.