Experimental data on SOA formation from mixtures of anthropogenic and biogenic organic compounds

Marta García Vivanco, Manuel Santiago, Miguel Sánchez, Mª Ángeles Clavero, Esther Borrás, Milagros Ródenas, Francisco Alacreu, M. Vázquez, E. Clemente, R. Porras, A. Muñoz, Ariel Stein

Abstract

Secondary organic aerosols (SOA) constitute a significant fraction of the atmospheric particulate matter. Theses particles are formed as a consequence of the oxidation reaction of certain organic gases that leads to the formation of low-volatility compounds. As for other pollutants, air quality models allow the simulation of particle levels and thus models constitute a powerful tool in air quality management. Nevertheless, theaccepted use of models must be based on the validation of its capacity to reproduce observed concentrations.
Air monitoring sites provide measured information of a large variety of ambient pollutants. Unfortunately, measurements on SOA are not normally available, as current monitoring networks do not include instrumentation to distinguish primary from secondary sources of organic carbonaceous aerosol. This paper presents
a set of photooxidation experiments performed in the European Photorreactor (EUPHORE) smog chamber (CEAM, Spain) under different experimental conditions to investigate SOA formation. The use of chambers allows the isolation of atmospheric chemistry and aerosol formation processes. Thus, although these measurements were obtained at initial precursor concentrations higher than those in atmospheric conditions, they constitute a valuable set of information for SOA model evaluation purposes.

Keywords

SOA formation, chamber experiments, organic gases, aerosols.

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