A Diagnostic Comparison of Emep and Eurad Model Results for a Wet Deposition Episode in July 1990

Several models exist in Europe aiming at quantifying the transport, transformation and deposition of air pollutants. The structure and complexity of the models vary and often depend on the scope of the applications. Within the EMEP-programme a focus has been on quantifying long term loads of acidity to the European Environment and consequently the relative simple two-dimensional Acid Rain model is employed (see Eliassen and Saltbones, 1983; Barret et al., 1995). Under the EUROTRAC programme the coupled acid rain and photochemical EURAD-model (European Regional Air Pollution Dispersion model) has been developed (Hass et al., 1993, Chang et al., 1987). The purpose of the EURAD model has been to investigate the processes leading to the formation of acidifying components and ozone on the European scale on a relatively short time-scale (days to weeks).