Secondary organic aerosol (SOA) formation from monoterpene ozonolysis in the presence of inorganic aerosols: acid effects on SOA yields Public Deposited

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Last Modified
  • March 21, 2019
Creator
  • Northcross, Amanda Laura
    • Affiliation: Gillings School of Global Public Health, Department of Environmental Sciences and Engineering
Abstract
  • Traditionally SOA formation has been predicted using a thermodynamic partitioning theory which does not take into consideration the presence of inorganic aerosols although SOA mass has been shown to be affected by the presence inorganic acidic aerosols. Acid particles are able to catalyze the formation of higher molecular weight structures within SOA and alter the thermodynamic partitioning equilibrium. The equilibrium is reestablished when additional mass partitions the aerosols increasing the particulate mass formed. The effects of preexisting acidic particles on the SOA formation of a series of biogenic precursor gases has been investigated experimentally using an indoor smog chamber and modeled using mathematical models describing the gas, and particle phase chemistry. The model predicts the total SOA mass and the fraction of heterogeneous acid-catalyzed aerosol mass formed. The effect of varying acidity and relative humidity on the heterogeneous acid-catalyzed aerosol mass produced is also captured. Thermal gravimetric analysis was used to quantify the fraction of heterogeneous acid catalyzed aerosol mass in SOA, and to evaluate model predictions. The developed model more accurately describes the SOA formation process as it occurs in the ambient atmosphere by including the influence of inorganic aerosols.
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  • In Copyright
Advisor
  • Jang, Myoseon
Degree granting institution
  • University of North Carolina at Chapel Hill
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  • Open access
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