| Autor: |
Li, Zijun, Buchholz, Angela, Barreira, Luis M. F., Ylisirniö, Arttu, Hao, Liqing, Pullinen, Iida, Schobesberger, Siegfried, Virtanen, Annele |
| Předmět: |
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| Zdroj: |
Atmospheric Chemistry & Physics; 2023, Vol. 23 Issue 1, p203-220, 18p |
| Abstrakt: |
Many recent secondary organic aerosol (SOA) studies mainly focus on biogenic SOA particles formed under low NO x conditions and thus are applicable to pristine environments with minor anthropogenic influence. Although interactions between biogenic volatile organic compounds and NO x are important in, for instance, suburban areas, there is still a lack of knowledge about the volatility and processes controlling the evaporation of biogenic SOA particles formed in the presence of high concentrations of NO x. Here we provide detailed insights into the isothermal evaporation of α -pinene SOA particles that were formed under low NO x and high NO x conditions to investigate the evaporation process and the evolution of particle composition during the evaporation in more detail. We coupled Filter Inlet for Gases and AEROsols-Chemical Ionization Mass Spectrometer (FIGAERO-CIMS) measurements of the molecular composition and volatility of the particle phase with isothermal evaporation experiments conducted under a range of relative humidity (RH) conditions from low RH (<7 % RH) to high RH (80 % RH). Very similar changes were observed in particle volatility at any set RH during isothermal evaporation for the α -pinene SOA particles formed under low NO x and high NO x conditions. However, there were distinct differences in the initial composition of the two SOA types, possibly due to the influence of NO x on the RO 2 chemistry during SOA formation. Such compositional differences consequently impacted the primary type of aqueous-phase processes in each type of SOA particle in the presence of particulate water. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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