Welcome to the official FLEXPART web site

FLEXPART (“FLEXible PARTicle dispersion model”) is a Lagrangian transport and dispersion model suitable for the simulation of a large range of atmospheric transport processes. Applications range from the dispersion of radionuclides or air pollutants, over the establishment of flow climatologies, to the analysis of Earth’s water cycle. FLEXPART also produces output suitable for inverse determination of emission sources, e.g., of greenhouse gases or volcanic ash.

FLEXPART is a further development of its predecessor FLEXTRA (“FLEXible TRAjectory model”). Both FLEXTRA and FLEXPART have been open source models since the beginning and, over time have found a large international user community. In addition to the reference version of FLEXPART which is based on meteorological data from ECMWF or GFS, several branches of FLEXPART have been developed, which can be run with meteorological data from mesoscale models.

With the growing number of FLEXPART users, it has become important to provide a platform where the FLEXPART community can effectively exchange information, further develop the model together, and provide help to new users. The main FLEXPART developers have together chosen this platform for organizing their collaborative work and keeping track of the changes in FLEXPART. We would like to ask also all other users to share not only further developments of FLEXPART but also all other (e.g., post-processing or plotting) tools related to FLEXPART which may be useful for others.

This software development platform for FLEXPART, powered by trac, has been started in June 2012 and with FLEXPART version 9.0.

Basic information about this site can be found in SystemAspects. For a detailed list of existing pages see Index.

Code download


Ticket system

Users are invited to create tickets to the development team with bug reports, proposals for enhancements, etc. The ticket system is also used by the developers themselves. Tickets can be [viewed] by anyone, and created by registered users.

The automatic registration system is unavailable. For registration please write to [at] You will get user and password replied within some delay.

Last modified 10 months ago Last modified on Jun 17, 2016, 12:27:35 PM
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