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Published September 16, 2002 | Published
Journal Article Open

Secondary organic aerosol 3. Urban/regional scale model of size- and composition-resolved aerosols


The California Institute of Technology (CIT) three-dimensional urban/regional atmospheric model is used to perform comprehensive gas- and aerosol-phase simulations of the 8 September 1993 smog episode in the South Coast Air Basin of California (SoCAB) using the atmospheric chemical mechanism of part 1 [Griffin et al., 2002] and the thermodynamic module of part 2 [Pun et al., 2002]. This paper focuses primarily on simulations of secondary organic aerosol (SOA) and determination of the species and processes that lead to this SOA. Meteorological data and a gas and particulate emissions inventory for this episode were supplied directly by the South Coast Air Quality Management District. A summer 1993 atmospheric sampling campaign provides data against which the performance of the model is evaluated. Predictions indicate that SOA formation in the SoCAB is dominated by partitioning of hydrophobic secondary products of the oxidation of anthropogenic organics. The biogenic contribution to total SOA increases in the more rural eastern portions of the region, as does the fraction of hydrophilic SOA, the latter reflecting the increasing degree of oxidation of SOA species with atmospheric residence time.

Additional Information

Copyright 2002 by the American Geophysical Union. Received 23 February 2001; revised 15 January 2002; accepted 18 January 2002; published 11 September 2002. This work was funded by the United States Environmental Protection Agency under grant R826371-01, by the State of California Air Resources Board under contract 98-314, and by the Electric Power Research Institute. The simulations were performed by the Aeneas supercomputer at the University of California, Irvine. Although the research described in this article has been funded in part by the U. S. Environmental Protection Agency's STAR program through grant R826371-01, it has not been subjected to any EPA review and therefore does not necessarily reflect the views of the Agency, and no official endorsement should be inferred.

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