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Accession Number
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PB2012-111923
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Title
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SOA Formation: Chamber Study and Model Development.
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Publication Date
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May 2012
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Media Count
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186p
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Personal Author
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D. R. Cocker G. Heo S. Nakao W. P. L. Carter
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Abstract
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An experimental and mechanism development study was carried out to enhance the recently developed SAPRC-11 gas phase aromatic mechanism so it can predict secondary organic aerosol (SOA) formation from the atmospheric reactions of aromatics. This phase of the project covered dry conditions and 300K. A total of 158 dual reactor chamber experiments were carried out using the UCR-EPA environmental chamber, and their results were combined with previous data from this chamber to provide a database of 315 separate reactor irradiations for mechanism evaluation. A total of 14 representative aromatic hydrocarbons and 7 representative phenolic compounds were studied with varying reactant and NOx levels and in some cases with different light sources and other added reactants. Methods were developed and evaluated to represent gas-particle partitioning, nucleation, and chamber effects when modeling the experiments. Alternative mechanisms were examined and SOA yield and gas-particle partitioning parameters were optimized to simulate the available chamber data. The model simulated most of the data without large biases but with larger run-to-run variability in model performance than observed in ozone mechanism evaluations, and potential evaluation problems were observed for some compounds. It is concluded that this new mechanism reflects the current state of the science. Recommendations are given for the next phase of SOA mechanism development and other needed research.
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Keywords
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Aeromatics
Atmospheric reactions
Chambers
Characterization
Chemical mechanisms
Experimental methods
Figures
Mechanism evaluation
Model development
Modeling methods
SAPRC-11 gas phase aromatic mechanism
Secondary organic aerosol (SOA)
Tables (Data)
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Source Agency
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California Air Resources Board Resources Agency
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NTIS Subject Category
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68A - Air Pollution & Control
99F - Physical & Theoretical Chemistry
91A - Environmental Management & Planning
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Corporate Author
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California Univ., Riverside. Center for Environmental Research and Technology.
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Document Type
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Technical report
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Title Note
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Final rept.
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NTIS Issue Number
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1222
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Contract Number
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ABR-08-326
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