User Guide


Introduction

FALL3D is an Eulerian model for atmospheric passive transport and deposition based on the so-called advection–diffusion–sedimentation (ADS) equation. The code version 8.x has been redesigned and rewritten from scratch in order to overcome legacy issues and allow for successive optimisations in the preparation towards extreme-scale computing. The new versions include significant improvements from the point of view of model physics, numerical algorithmic methods, and computational efficiency. In addition, the capabilities of the model have been extended by incorporating new features such as the possibility of running ensemble forecasts and dealing with multiple atmospheric species (i.e. volcanic ash and gases, mineral dust, and radionuclides). Ensemble run capabilities are supported since version 8.1, making it possible to quantify model uncertainties and improve forecast quality.

The FALL3D code is one of the flagship codes included in the European Centre of Excellence for Exascale in Solid Earth (ChEESE).

  • FALL3D is an open-source code available through this GitLab repository
  • FALL3D is also available in Zenodo: DOI

References

  • Folch, A., Mingari, L., Gutierrez, N., Hanzich, M., Macedonio, G., and Costa, A.: FALL3D-8.0: a computational model for atmospheric transport and deposition of particles, aerosols and radionuclides – Part 1: Model physics and numerics, Geosci. Model Dev., 13, 1431–1458, https://doi.org/10.5194/gmd-13-1431-2020, 2020.
  • Prata, A. T., Mingari, L., Folch, A., Macedonio, G., and Costa, A.: FALL3D-8.0: a computational model for atmospheric transport and deposition of particles, aerosols and radionuclides – Part 2: Model validation, Geosci. Model Dev., 14, 409–436, https://doi.org/10.5194/gmd-14-409-2021, 2021.

Contributing

The FALL3D documentation is free and open source. You can find the source code on GitLab and issues and feature requests can be posted on the GitLab issue tracker.

We encourage the community to fix bugs and add features: if you'd like to contribute, please read the CONTRIBUTING.md guide and consider opening a merge request.

License

FALL3D and this User Guide are released under the GNU General Public License (GPL).