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NARSTO Workshop on Innovative Methods for Emission Inventory Development and Evaluation University of Texas, Austin October 14-17, 2003 |
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Estimates Of Anthropogenic Secondary Organic
Aerosol Formation In Houston, Texas
Wipawee Dechapanya, Matthew Russell, David T. Allen*
Center for Energy and Environmental Resources
University of Texas, Austin, Texas 78758
An important component of emission inventory development in support of fine particulate matter modeling is the development of emission estimates, by source category, for secondary organic aerosol precursors. Secondary Organic Aerosol (SOA) formation due to precursor emissions from anthropogenic sources in the Houston/Galveston (HG) area was estimated by multiplying the anthropogenic emissions of SOA precursors by fractional aerosol coefficients (FAC). The analysis indicated that area and nonroad mobile sources contributed 56% of the aerosol precursor emissions, while mobile and point sources contributed 27% and 16%, respectively. However, due to high SOA yields of the precursors emitted by point sources, especially emissions of terpenes from pulp and paper processing and emissions of aromatics, point source emissions resulted in 53% of the projected SOA from anthropogenic sources in the Houston-Galveston (HG) area. Estimated SOA formation rates were consistent with average concentrations of particle phase organic carbon in the Houston-Galveston area.