Evaluation of the Equilibrium, Dynamic, and Hybrid Aerosol Modeling ...

Aerosol Science and Technology 37: 53–64 (2003) c 2003 American Association for Aerosol Research ° Published by Taylor and Francis 0278-6826/03/$12.00 + .00 DOI: 10.1080/02786820390112588

Evaluation of the Equilibrium, Dynamic, and Hybrid Aerosol Modeling Approaches Bonyoung Koo,1 Timothy M. Gaydos,1 and Spyros N. Pandis2 1

Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania Departments of Chemical Engineering and Engineering and Public Policy, Carnegie Mellon University, Pittsburgh, Pennsylvania 2

The continued development of the dynamic and hybrid approaches (Pilinis et al. 2000; Capaldo et al. 2000) for the simulation of atmospheric aerosol dynamics is discussed in this paper. A linear interpolation method is proposed for the mapping of the moving aerosol size/composition distribution onto a fixed size grid. The 3 aerosol modules are incorporated into a trajectory model that includes descriptions of gas-phase chemistry, secondary organic aerosol formation, vertical dispersion, dry deposition, and emissions. The 3 approaches are evaluated against measurements from the Southern California Air Quality Study (SCAQS). All 3 models predict the 4–6 h averaged PM2.5 (particulate matter with diameter ≤2.5 microns) and PM10 (particulate matter with diameter ≤10 microns) mass concentrations of the major aerosol species with errors