Abstract
The air pollution in a region is influenced by all atmospheric scales. Because it is not possible to resolve all scales in a single model, different models have been developed which describe the air pollution in certain regions, like the European scale model EURAD (EURopean Acid Deposition model (Ebel et al., 1989)) and the mesoscale model system KAMM/DRAIS (KArlsruher Meteorologisches Modell (Adrian and Fiedler, 1991)/DReidimensionales Ausbreitungs- und Immissions-Simulationsmodell (Schwartz, 1996)). Those effects which are smaller than the grid resolution of a model (subgrid effects) have to be considered by appropriate parameterizations or by nesting procedures. Effects resulting from scales which are even larger than the model domain are usually introduced into the model by the boundary conditions.
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