ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-5-2461-2005 Technical note: The Lagrangian particle dispersion model FLEXPART version 6.2 Stohl A. 1 Forster C. 1 Frank A. 2 Seibert P. 2 Wotawa G. 3 Norwegian Institute for Air Research, Kjeller, Norway Institute of Meteorology, University of Natural Resources and Applied Life Sciences, Vienna, Austria Preparatory Commission for the Comprehensive Nuclear Test Ban Treaty Organization, Vienna, Austria 21 09 2005 5 9 2461 2474 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/5/2461/2005/acp-5-2461-2005.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/5/2461/2005/acp-5-2461-2005.pdf

The Lagrangian particle dispersion model FLEXPART was originally (about 8 years ago) designed for calculating the long-range and mesoscale dispersion of air pollutants from point sources, such as after an accident in a nuclear power plant. In the meantime FLEXPART has evolved into a comprehensive tool for atmospheric transport modeling and analysis. Its application fields were extended from air pollution studies to other topics where atmospheric transport plays a role (e.g., exchange between the stratosphere and troposphere, or the global water cycle). It has evolved into a true community model that is now being used by at least 25 groups from 14 different countries and is seeing both operational and research applications. A user manual has been kept actual over the years and was distributed over an internet page along with the model's source code. In this note we provide a citeable technical description of FLEXPART's latest version (6.2).