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- Title
Modeling of secondary organic aerosol yields from laboratory chamber data.
- Authors
Chan, M. N.; Chan, A. W. H.; Chhabra, P. S.; Surratt, J. D.; Seinfeld, J. H.
- Abstract
A product-specific model for secondary organic aerosol (SOA) formation and composition based on equilibrium gas-particle partitioning is evaluated. The model is applied to represent laboratory data on the ozonolysis of α-pinene under dry, dark, and low- NOx conditions in the presence of ammonium sulfate seed aerosol. Using five major identified products, the model is fit to the chamber data. From the optimal fitting, SOA oxygen-to-carbon (O/C) and hydrogen-to-carbon (H/C) ratios are modeled. The discrepancy between measured H/C ratios and those based on the oxidation products used in the model fitting suggests the potential importance of particle-phase reactions. Data fitting is also carried out using the volatility basis set, wherein oxidation products are parsed into volatility bins. The product-specific model is best used for an SOA precursor for which a substantial fraction of the aerosol-phase oxidation products has been identified.
- Subjects
ATMOSPHERIC aerosols; AIR pollution; OZONOLYSIS; AMMONIUM sulfate; OXIDATION; ATMOSPHERIC circulation; ATMOSPHERIC chemistry
- Publication
Atmospheric Chemistry & Physics Discussions, 2009, Vol 9, Issue 2, p9457
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/acpd-9-9457-2009