Modelling gaseous dry deposition in AURAMS: a unified regional air-quality modelling system

摘要

An upgraded parameterization scheme for gaseous dry-deposition velocities has been developed for a new regional air-quality model with a 91-species gas-phase chemistry mechanism, of which 48 species are "transported" species. The well-known resistance analogy to dry deposition is adopted in the present scheme, with both O_3 and SO_2 taken as base species. Stomatal resistances are calculated for all dry-depositing species using a "sunlit/shaded big-leaf" canopy stomatal resistance submodel. Dry-ground, wet-ground, dry-cuticle, and wet-cuticle resistances for O_3 and SO_2, and parameters for calculating canopy stomatal resistance and aerodynamic resistance for these two base species are given as input parameters for each of the 15 land-use categories and/or five seasonal categories considered by the scheme.