Mathematical model for gas-particle partitioning of secondary organic aerosols
Abstract
A dynamic model is developed for gas-particle absorptive partitioning of semi-volatile organic aerosols. The model is applied to simulate a pair of m-xylene/NOₓ outdoor smog chamber experiments. In the presence of an inorganic seed aerosol a threshold for aerosol formation is predicted. An examination of characteristic times suggests conditions where an assumption of instantaneous gas-particle equilibrium is justified. Semi-volatile products that are second-generation, rather than first-generation, products of a parent hydrocarbon cause a delay in aerosol formation due to the delayed rate at which the second-generation products are formed. The gas-particle accommodation coefficient is the principal transport parameter and is estimated to have a value between 1.0 and 0.1 for the m-xylene aerosol.
Additional Information
This work was supported, in part, by U.S. Environmental Protection Agency Center on Airborne Organics (R-819714-01-0), by National Science Foundation grant ATM-9307603, by the Coordinating Research Council (A-5-1), and by the Chevron Corporation. Spyros Pandis acknowledges support from EPA Grant R-823514-01-0. The authors would also like to thank Hali Forstner for insight regarding conditions necessary for nucleation.Additional details
- Eprint ID
- 119463
- Resolver ID
- CaltechAUTHORS:20230222-242167600.4
- R-819714-01-0
- Environmental Protection Agency (EPA)
- ATM-9307603
- NSF
- A-5-1
- Coordinating Research Council
- Chevron Corporation
- R-823514-01-0
- Environmental Protection Agency (EPA)
- Created
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2023-02-22Created from EPrint's datestamp field
- Updated
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2023-02-22Created from EPrint's last_modified field