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:

Brewer J. F.12ORCID,Jacob D. J.1,Jathar S. H.3ORCID,He Y.3,Akherati A.34ORCID,Zhai S.1,Jo D. S.5ORCID,Hodzic A.5ORCID,Nault B. A.6,Campuzano‐Jost P.78ORCID,Jimenez J. L.78ORCID,Park R. J.9ORCID,Oak Y. J.9ORCID,Liao H.10ORCID

Affiliation:

1. Harvard John A. Paulson School of Engineering and Applied Sciences Harvard University Cambridge MA USA

2. Department of Soil, Water, and Climate University of Minnesota St. Paul MN USA

3. Department of Mechanical Engineering Colorado State University Ft. Collins CO USA

4. Department of Atmospheric Sciences Colorado State University Ft. Collins CO USA

5. National Center for Atmospheric Research (NCAR) Boulder CO USA

6. Center for Aerosol and Cloud Chemistry Aerodyne Research Billerica MA USA

7. Department of Chemistry University of Colorado Boulder CO USA

8. Cooperative Institute for Research in Environmental Sciences University of Colorado Boulder CO USA

9. School of Earth and Environmental Sciences Seoul National University Seoul Republic of Korea

10. Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Collaborative Innovation Center of Atmospheric Environment and Equipment Technology School of Environmental Science and Engineering Nanjing University of Information Science and Technology Nanjing China

Abstract

AbstractWe 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.

Funder

Samsung

Publisher

American Geophysical Union (AGU)

Subject

Space and Planetary Science,Earth and Planetary Sciences (miscellaneous),Atmospheric Science,Geophysics

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