Comparative Review of Inorganic Aerosol Thermodynamic Equilibrium Modules:211 Similarities, Differences, and Their Likely Causes

摘要

We present a quantative evaluation of five thermodyanmic equilibrium modules that211u001eare currently used in three-dimensional (3-D) air quality PM models. The 211u001ecomparison is performed in stand-alone modes (i.e., outside of their 3-D host air 211u001equality models) to eliminate the influence of other atmospheric processes (e.g., 211u001egas-phase chemistry, transport and dispersion, dry and wet methods, emissions) 211u001etreated in the 3-D host models. Thus, the difference in PM predictions among 211u001ethese modules are due solely to the differences in the model formulations and/or 211u001enumerical algorithms. The modules selected for comparison include MARS-A, 211u001eSEQUILIB, SCAPE2, EQUISOLV II, and AIM2.