1Description of the Eulerian Acid Deposition Model

The Eulerian acid deposition model has been developed at MSC-W as a multi-layer model for simulating atmospheric transport and deposition of nitrogen and sulphur compounds in Europe. The first version of the EMEP Eulerian model was developed by Berge (1993a) and then modified and further improved by Jakobsen et al. (1995). At this stage, the model was called MADE50- Multi-level Acid Deposition model for Europe with 50 km resolution. Nitro-gen chemistry was introduced into the model by Jonson and Berge (1995) and a new dry depo-sition module for SO2, NO2, HNO3 and NH3 was implemented by Jakobsen et al., (1996). The MADE50 model was run for 1992 and the results compared with measurements available from the EMEP stations in Europe (Jakobsen et al., 1995; Jonson et al., 1998a, 1998b). Model vali-dation for 1996 data is described in Olendrzynski et al., (1998). The development of the MADE50 model has been documented in many publications (e.g