The FLEXible PARTicle dispersion model (FLEXPART) is a Lagrangian Particle Dispersion Model used to simulate air parcel trajectories. It can be run in either forward or backward mode. The forward mode is typically used to determine the downwind concentration or mixing ratio of pollutants. The backward mode can be used to estimate footprint areas, to determine the origin of observed emissions. FLEXPART has inherited large portions of its code from its predecessor, FLEXTRA (FLEXible TRAjectory model). The first version of FLEXPART was released in 1998 and was considered free software. Since the release of version 8.2 in 2010, the code is distributed under the GNU General Public License (GPL) Version 3. Due to a growing user base the main developers decided to provide an online platform for developers and modellers, which was launched together with the release of version 9.0 in June 2012. More information...
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