Modelling the Contribution of Secondary Organic Aerosol in Air Pollution Events - From Smog Chamber to Airshed
A secondary organic aerosol (SOA) formation module has been coupled to the air pollution model (TAPM) with an enhanced chemical-transport module (CTM). This will enable TAPM-CTM to estimate the contribution of ultrafine and fine aerosol derived from the photooxidation of volatile organic compounds.
The module is based on an equilibrium absorption gas / aerosol partitioning model developed by Odum et al., (1997) and the yield concept defined by Pankow et al. (1994). Photooxidation experiments were undertaken using CSIRO's environmental chamber to derive parameter values for specific species. Other parameter estimates were derived from literature or are based on analogies of similar structured compounds.
A spatial distribution of SOA estimates are presented across Melbourne's greater metropolitan area. A correlation between the composition of the simulated SOA and land-use patterns is discussed.