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Equilibration timescale of atmospheric secondary organic aerosol partitioning
Abstract
Secondary organic aerosol (SOA) formed from partitioning of oxidation products of anthropogenic and biogenic volatile organic compounds (VOCs) accounts for a substantial portion of atmospheric particulate matter. In describing SOA formation, it is generally assumed that VOC oxidation products rapidly adopt gas‐aerosol equilibrium. Here we estimate the equilibration timescale,τeq, of SOA gas‐particle partitioning using a state‐of‐the‐art kinetic flux model.τeq is found to be of order seconds to minutes for partitioning of relatively high volatility organic compounds into liquid particles, thereby adhering to equilibrium gas‐particle partitioning. However,τeq increases to hours or days for organic aerosol associated with semi‐solid particles, low volatility, large particle size, and low mass loadings. Instantaneous equilibrium partitioning may lead to substantial overestimation of particle mass concentration and underestimation of gas‐phase concentration.
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Cites
Evolution of Organic Aerosols in the Atmosphere
Jimenez, J. L., Canagaratna, M. R., Donahue, N. M., Prevot, A. S. H., Zhang, Q., Kroll, J. H., DeCarlo, P. F., Allan, J. D., Coe, H., Ng, N. L., et al. (2009) · Science · doi:10.1126/science.1180353 · Cited by 4,167
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Pöschl, U., & Shiraiwa, M. (2015) · Chemical Reviews · doi:10.1021/cr500487s · Cited by 657
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Metadata
- Authors
- Shiraiwa, M., & Seinfeld, J. H.
- Venue
- Geophysical Research Letters
- Publisher
- American Geophysical Union (AGU)
- Published
- 2012-12-18
- Volume
- 39
- Issue
- 24
- ISSN
- 0094-8276 (ISSN-L)
- 1944-8007
- OpenAlex
- W1923359143
- Cited by
- 298
- References
- 1
- FWCI
- 10.02
- Type
- journal article
- Language
- en
- Open access
- closed
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- Shiraiwa, M., & Seinfeld, J. H. (2012). Equilibration timescale of atmospheric secondary organic aerosol partitioning. Geophysical Research Letters. https://doi.org/10.1029/2012gl054008
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