The air pollution transport is subject to different scale phe- nomena, each characterized by specific atmospheric dynamics mecha- nisms, chemical transformations, typical time scales etc. The air pollution pattern is formed as a result of interaction of different processes. The present study attempts to make some evaluations of the contribution of different processes to the local to regional pollution over Bulgaria. The US EPA Model-3 system is chosen as a modelling tool. As the NCEP Global Analysis Data with one degree resolution is used as meteorolog- ical background, the MM5 and CMAQ nesting capabilities are applied for downscaling the simulations to a 3 km resolution over Bulgaria. The TNO emission inventory is used as emission input. Special pre- processing procedures are created for introducing temporal profiles and speciation of the emissions. The biogenic emissions are estimated by the model SMOKE. The Models-3 "Integrated Process Rate Analysis" option is applied to discriminate the role of different dynamic and chemical processes for the pollution formation. The processes that are considered are: advection, diffusion, mass adjustment, emissions, dry deposition, chemistry, aerosol processes and cloud processes/aqueous chemistry. The simulations are carried out for several years. The obtained results make it possible to evaluate the impact of the above listed processes in many different terms - spatial pattern, averaged over the country or for selected points, seasonal behaviour.
['Georgi Gadzhev', 'Kostadin Ganev', 'Nikolay Miloshev', 'Dimiter Syrakov', 'Maria Prodanova']
Analysis of the Processes Which Form the Air Pollution Pattern over Bulgaria