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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
03 Jan 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).
Aerosol sources in the western Mediterranean during summertime: A model-based approach
Mounir Chrit1, Karine Sartelet1, Jean Sciare2,6, Jorge Pey3,a, José B. Nicolas4, Nicolas Marchand3, Evelyn Freney4, Karine Sellegri4, Matthias Beekmann5, and François Dulac2 1CEREA, joint laboratory Ecole des Ponts ParisTech – EDF R&D, Université Paris-Est, 77455 Champs sur Marne, France
2LSCE, CNRS-CEA-UVSQ,IPSL,Université Paris Saclay, Gif-sur-Yvette, France
3Aix Marseille University-CNRS, LCE, Marseille, France
4LAMP, UMR CNRS-Université Blaise Pascal, OPGC, Aubière, France
5LISA, UMR 7583, Université Paris Diderot-Université Paris-Est Créteil, IPSL, Créteil, France
6EEWRC, The Cyprus Institute, Nicosia, Cyprus
anow at: Spanish Geological Survey, IGME, 50006 Zaragoza, Spain
Abstract. In the framework of ChArMEx (the Chemistry–Aerosol Mediterranean Experiment), the air-quality model Polyphemus is used to understand the sources of inorganic and organic particles in the western Mediterranean and to evaluate the uncertainties linked to the model parameters (meteorological fields, anthropogenic and sea-salt emissions, hypotheses related to the model representation of condensation/evaporation). The model is evaluated by comparisons to in-situ aerosol measurements performed during three consecutive summers (2012, 2013 and 2014). The model-to-measurement comparisons concern the concentrations of PM10, PM1, Organic Matter in PM1 (OMPM1) and inorganic aerosol concentrations monitored at a remote site (Ersa) in Corsica Island, as well as during airborne measurements performed above the western Mediterranean Sea. Organic particles are mostly from biogenic origin. The model parameterization of sea-salt emissions has shown to strongly influence the concentrations of all particulate species (PM10, PM1, OMPM10 and inorganic concentrations). Although the emission of organic matter by the sea has shown to be low, organic concentrations are influenced by sea-salt emissions, because they provide a mass onto which gaseous hydrophilic organic compound can condense. PM10, PM1, OMPM1 are also very sensitive to meteorology, because it affects not only the transport of pollutants, but also natural emissions (biogenic and sea salt). To avoid large and unrealistic sea-salt concentrations, a parameterization with an adequate wind-speed power law is chosen. Sulfate is shown to be strongly influenced by anthropogenic (ship) emissions. PM10, PM1, OM1 and sulfate concentrations are better described using the emission inventory with the best spatial description of ships emissions (EDGAR-HTAP). However, this is not true for nitrate, ammonium and chloride concentrations, which are very dependent on the hypotheses used in the model for condensation/evaporation. Model simulations show that sea-salt aerosols above the sea are not mixed with background transported aerosols. Taking into account the mixing state of particles with a dynamic approach of condensation/evaporation may be necessary to accurately represent inorganic aerosol concentrations.

Citation: Chrit, M., Sartelet, K., Sciare, J., Pey, J., Nicolas, J. B., Marchand, N., Freney, E., Sellegri, K., Beekmann, M., and Dulac, F.: Aerosol sources in the western Mediterranean during summertime: A model-based approach, Atmos. Chem. Phys. Discuss.,, in review, 2018.
Mounir Chrit et al.
Mounir Chrit et al.
Mounir Chrit et al.


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