GEM-AQ/EC, an on-line global multi-scale chemical weather modelling system: model development and evaluation of global aerosol climatology

摘要: Abstract. A global air quality modeling system GEM-AQ/EC was developed by implementing tropospheric chemistry and aerosol processes on-line into the Global Environmental Multiscale weather prediction model – GEM. Due to multi-scale features of GEM, integrated model, GEM-AQ/EC, is able investigate chemical at scales from urban domains. The current mechanism comprised 50 gas-phase species, 116 19 photolysis reactions, complemented a sectional module CAM (The Canadian Aerosol Module) with 5 aerosols types: sulphate, black carbon, organic sea-salt soil dust. Monthly emission inventories carbon boreal temperate vegetation fires were assembled using most reliable areas burned datasets countries, statistical databases derived remote sensing products 1995–2004. run for ten years 1995–2004 re-analyzed meteorology on uniform 1° × horizontal resolution domain 28 hybrid levels extending up 10 hPa. simulating results compared various observations including surface network around globe satellite data. Regional are reasonably captured emission, concentrations optical depth. For types aerosols, satisfactory correlations achieved between modeled observed some degree systematic bias possibly due large uncertainties in emissions used this study. distribution natural contributions total obtained observations.