ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-12-7825-2012 The EMEP MSC-W chemical transport model – technical description Simpson D. 1 2 Benedictow A. 1 Berge H. 1 Bergström R. 3 4 Emberson L. D. 5 Fagerli H. 1 Flechard C. R. 6 Hayman G. D. 7 Gauss M. 1 Jonson J. E. 1 Jenkin M. E. 8 Nyíri A. 1 Richter C. 9 Semeena V. S. 1 Tsyro S. 1 Tuovinen J.-P. 10 Valdebenito Á. 1 Wind P. 1 11 EMEP MSC-W, Norwegian Meteorological Institute, Oslo, Norway Dept. Earth & Space Science, Chalmers Univ. Technology, Gothenburg, Sweden Dept. Chemistry, Univ. of Gothenburg, Gothenburg, Sweden Swedish Meteorological and Hydrological Institute, Norrköping, Sweden Stockholm Environment Institute, University of York, York, England INRA, Agrocampus Ouest, UMR 1069 SAS, Rennes, France Centre for Ecology and Hydrology, Wallingford, Oxfordshire, OX10 8BB, UK Atmospheric Chemistry Services, Okehampton, Devon EX20 1FB, UK Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) mbH, Cologne, Germany Finnish Meteorological Institute, P.O. Box 503, 00101 Helsinki, Finland University of Tromsø, 9037 Tromsø, Norway 31 08 2012 12 16 7825 7865 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/12/7825/2012/acp-12-7825-2012.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/12/7825/2012/acp-12-7825-2012.pdf

The Meteorological Synthesizing Centre-West (MSC-W) of the European Monitoring and Evaluation Programme (EMEP) has been performing model calculations in support of the Convention on Long Range Transboundary Air Pollution (CLRTAP) for more than 30 years. The EMEP MSC-W chemical transport model is still one of the key tools within European air pollution policy assessments. <br></br> Traditionally, the model has covered all of Europe with a resolution of about 50 km × 50 km, and extending vertically from ground level to the tropopause (100 hPa). The model has changed extensively over the last ten years, however, with flexible processing of chemical schemes, meteorological inputs, and with nesting capability: the code is now applied on scales ranging from local (ca. 5 km grid size) to global (with 1 degree resolution). The model is used to simulate photo-oxidants and both inorganic and organic aerosols. <br></br> In 2008 the EMEP model was released for the first time as public domain code, along with all required input data for model runs for one year. The second release of the EMEP MSC-W model became available in mid 2011, and a new release is targeted for summer 2012. This publication is intended to document this third release of the EMEP MSC-W model. The model formulations are given, along with details of input data-sets which are used, and a brief background on some of the choices made in the formulation is presented. The model code itself is available at <a href="www.emep.int"target="_blank">www.emep.int</a>, along with the data required to run for a full year over Europe.

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