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URBAN AEROSOL TRANSFORMATION AND TRANSPORT MODELING
Citation:
Seo, Y. AND J. Brock. URBAN AEROSOL TRANSFORMATION AND TRANSPORT MODELING. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/3-90/017.
Description:
Modules for secondary aerosol formation have been included in the urban scale K-theory aerosol model, AR0S0L. hese are: (1) An empirical first-order 502 conversion scheme due to Meaghers, termed EMM; (2) The lumped parameter kinetic model termed the Carbon Bond Mechanism, in the version CBM-lV; (3) The lumped parameter kinetic model termed the Atkinson Lloyd Mechanism (ALM), in the 1985 ERT version; (4) The equilibrium Model for an Aerosol Reacting System (MARS) for prediction of equilibrium partition of nitrates, sulfates, and ammonium between the gas and aerosol phases; (5) The Binary Aerosol Dynamics Model (BADM) for nucleation and growth of secondary aerosol. The modules for secondary sulfate and nitrate formation have been demonstrated with data from the 1982 Philadelphia Aerosol Field Study (PATS). oth EMM and CBM give secondary sulfate concentrations whose contours are very similar and which differ mainly in the magnitudes of these concentrations. MM was found to give secondary sulfate concentrations around ten times those with CBM. MARS was used to demonstrate secondary sulfate speciation from the conversions given by CBM; as could be expected, the gas sulfate is very small and virtually all the sulfate resides in the aqueous aerosol. lso from the CBM calculations, nitrate speciation calculated by MARS was also obtained.