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Temperature dependent secondary organic aerosol formation from terpenes and aromatics

Lazaridis Michalis, Tørseth, K, Svendby,T.M

Πλήρης Εγγραφή

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Περίληψη

A new parameterization for the description of secondary organic aerosol (SOA) formation is presented. A large number of smog chamber experiments have been investigated in order to develop and validate empirical temperature dependent partition coefficients describing the formation of SOA. Compounds studied include monoterpenes (α-pinene and β-pinene) and aromatics (toluene and m-xylene). The VOC reactions with ozone, OH and NO3 radicals have been examined at a temperature range representative for the lower troposphere. The MAPS box model has been used to infer the amount of hydrocarbon consumed by the different oxidants. In particular, several β-pinene smog-chamber experiments performed at temperatures from 281 to 307 K have been simulated with the MAPS model. As most of the two product aerosol yield parameters available from the literature are derived from high temperature smog chamber experiments, their applicability in predicting SOA formation at low temperatures might be inadequate. Thus, a number of new aerosol yield parameters have been developed and tested in this work. Also various evaporation enthalpies are ascribed the different oxidation products to reflect the variations in volatility of the species. The new set of aerosol yield functions are intended for use in chemistry-transport models addressing SOA formation.

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