FLEXPART (“FLEXible PARTicle dispersion model”) is a Lagrangian transport and dispersion model suitable for the simulation of a large range of atmospheric transport processes. Apart from transport and turbulent diffusion, it is able to simulate dry and wet deposition, decay, and linear chemistry; it can be used in forward or backward mode, with prescribed sources (or receptors in backward applications) or in a domain-filling setting. It can be used from local to global scale.
FLEXPART is based on the trajectory model FLEXTRA (“FLEXible TRAjectory model”), which is still available here. FLEXPART has been a free and open software (see license) from the beginning and, over time has found a large international user community.
