Soa

Absorptive partitioning model for equilibrium gas–particle partitioning of semivolatile organic compounds. A compound distributes between the gas phase and an absorbing organic aerosol phase according to a mass-based partition coefficient K_om and the total absorbing organic aerosol mass C_oa. From Seinfeld and Pandis (2006), Chapter 9, Section 9.4, Equation 9.23.

Gas-particle partitioning model for a secondary organic aerosol (SOA) compound that does not interact with preexisting aerosol. The compound condenses as a pure substance once the reacted ROG exceeds a threshold set by the saturation concentration; below the threshold all product remains in the gas phase. From Seinfeld and Pandis (2006), Chapter 14, Section 14.5.2, Equations 14.6–14.18.

Two-product model for secondary organic aerosol (SOA) formation (Odum et al., 1996). Represents the complex mixture of oxidation products from a reactive organic gas (ROG) as two lumped surrogate products that partition between gas and aerosol phases according to an ideal-solution absorptive-partitioning equilibrium. Yields and saturation concentrations correspond to alpha-pinene oxidation from Seinfeld and Pandis (2006) Table 14.12.