1. A Scheme for Representing Aromatic Secondary Organic Aerosols in Chemical Transport Models: Application to Source Attribution of Organic Aerosols Over South Korea During the KORUS-AQ Campaign
- Author
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Brewer, J.F., Jacob, D.J., Jathar, S.H., He, Y., Akherati, A., Zhai, Shixian, Jo, D.S., Hodzic, A., Nault, B.A., Campuzano-Jost, P., Jimenez, J.L., Park, R.J., Oak, Y.J., Liao, H., Brewer, J.F., Jacob, D.J., Jathar, S.H., He, Y., Akherati, A., Zhai, Shixian, Jo, D.S., Hodzic, A., Nault, B.A., Campuzano-Jost, P., Jimenez, J.L., Park, R.J., Oak, Y.J., and Liao, H.
- Abstract
We present a new volatility basis set (VBS) representation of aromatic secondary organic aerosol (SOA) for atmospheric chemistry models by fitting a statistical oxidation model with aerosol microphysics (SOM-TOMAS) to results from laboratory chamber experiments. The resulting SOM-VBS scheme also including previous work on SOA formation from semi- and intermediate volatile organic compounds (S/IVOCs) is implemented in the GEOS-Chem chemical transport model and applied to simulation of observations from the Korea-United States Air Quality Study (KORUS-AQ) field campaign over South Korea in May–June 2016. Our SOM-VBS scheme can simulate the KORUS-AQ organic aerosol (OA) observations from aircraft and surface sites better than the default schemes used in GEOS-Chem including for vertical profiles, diurnal cycle, and partitioning between hydrocarbon-like OA and oxidized OA. Our results confirm the important contributions of oxidized primary OA and aromatic SOA found in previous analyses of the KORUS-AQ data and further show a large contribution from S/IVOCs. Model source attribution of OA in surface air over South Korea indicates one third from domestic anthropogenic emissions, with a large contribution from toluene and xylenes, one third from external anthropogenic emissions, and one third from natural emissions. © 2023. American Geophysical Union. All Rights Reserved.
- Published
- 2023