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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/gmd-2020-166
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2020-166
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: model evaluation paper 17 Jun 2020

Submitted as: model evaluation paper | 17 Jun 2020

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This preprint is currently under review for the journal GMD.

FALL3D-8.0: a computational model for atmospheric transport and deposition of particles, aerosols and radionuclides – Part 2: model applications

Andrew T. Prata1, Leonardo Mingari1, Arnau Folch1, Giovanni Macedonio2, and Antonio Costa3 Andrew T. Prata et al.
  • 1CASE Department, Barcelona Supercomputing Center, Barcelona, Spain
  • 2Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Vesuviano, Napoli, Italy
  • 3Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Bologna, Bologna, Italy

Abstract. This manuscript presents different application cases and validation results of the latest version release of the FALL3D-8.0 model, an open-source atmospheric transport model. The code has been redesigned from scratch to incorporate different categories of species and to overcome legacy issues that precluded its preparation towards extreme-scale computing. Validation results are shown for long-range dispersal of fine volcanic ash and SO2 clouds, tephra fallout deposits and dispersal and ground deposition of radionuclides. The first two examples (i.e. the 2011 Puyehue-Cordón Caulle and 2019 Raikoke eruptions) make use of geostationary satellite retrievals for two purposes: first, to furnish an initial data insertion condition for the model; and second, to validate the time series of model outputs against the satellite retrievals. The metrics used to validate the model simulations of volcanic ash and SO2 are the Structure, Amplitude and Location (SAL) metric and the Figure of Merit in Space (FMS). The other two application cases are validated with scattered ground-based observations of deposit load and local particle grain size distributions from the 23 February 2013 Mt. Etna eruption and with measurements from the Radioactivity Environmental Monitoring (REM) database during the 1986 Chernobyl nuclear accident. Simulation results indicate that FALL3D-8.0 outperforms previous code versions both in terms of model accuracy and code performance. We also find that simulations initialised with the new data insertion scheme consistently improve agreement with satellite retrievals at all lead times out to 48 hours for both SO2 and long-range fine ash simulations.

Andrew T. Prata et al.

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FALL3D-8.0 volcanic ash data insertion simulations for the 2011 Puyehue-Cordón Caulle (Chile) eruption A. Prata, L. Mingari, A. Folch, G. Macedonio, and A. Costa https://doi.org/10.5446/47095

FALL3D-8.0 volcanic SO2 data insertion simulations for the 2019 Raikoke (Russia) eruption A. Prata, L. Mingari, A. Folch, G. Macedonio, and A. Costa https://doi.org/10.5446/47096

FALL3D-8.0 volcanic ash simulations for the 2013 Mt Etna (Italy) eruption A. Prata, L. Mingari, A. Folch, G. Macedonio, and A. Costa https://doi.org/10.5446/47097

FALL3D-8.0 Cs-134 radionuclide simulations for the 1986 Chernobyl (Ukraine) nuclear accident A. Prata, L. Mingari, A. Folch, G. Macedonio, and A. Costa https://doi.org/10.5446/47098

FALL3D-8.0 Cs-137 radionuclide simulations for the 1986 Chernobyl (Ukraine) nuclear accident A. Prata, L. Mingari, A. Folch, G. Macedonio, and A. Costa https://doi.org/10.5446/47099

FALL3D-8.0 I-131 radionuclide simulations for the 1986 Chernobyl (Ukraine) nuclear accident A. Prata, L. Mingari, A. Folch, G. Macedonio, and A. Costa https://doi.org/10.5446/47100

Andrew T. Prata et al.

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Latest update: 10 Jul 2020
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Short summary
This paper presents FALL3D-8.0, the latest version release of an open-source code with a track record of 15+ years and a growing number of users in the volcanological and atmospheric communities. The code, originally conceived for atmospheric dispersal and deposition of tephra particles, has been extended to model other types of particles, aerosols and radionuclides. This paper details model applications and validation of FALL3D-8.0 using satellite, ground-deposit load and radionuclide data.
This paper presents FALL3D-8.0, the latest version release of an open-source code with a track...
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