Mathematical Modeling of the Formation and Dynamics of Acidic Aerosols

摘要

The major objective of the study was the development of a state-of-the-science particulate acidic aerosol model. The specific objectives were: Development of a model for predicting the size distribution and chemical composition of atmospheric aerosols containing sulfate, nitrate, ammonium, water, sodium, chloride and organic species from gas-phase concentrations and readily available atmospheric properties (temperature, relative humidity); and implementation of the model in a Lagrangian trajectory framework and evaluation on the model for selected days in predicting the size and composition distribution of aerosol in the SoCAB. Two aerosol systems were modelled: (a) sulfate/nitrate/ammonium system, and (b) ammonium/chloride/nitrate/sodium/sulfate/water system. The model was used to simulate the aerosol size and chemical composition for a trajectory from Anaheim to Rubidoux in the SoCAB, for which measured particulate concentrations were available. Comparisons between the observed and predicted aerosol concentrations showed that the model adequately predicted the concentrations of the major particulate compounds along the trajectory.