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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Model description paper 10 Apr 2019

Model description paper | 10 Apr 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).

Development of turbulent scheme in the FLEXPART-AROME v1.2.1 Lagrangian particle dispersion model

Bert Verreyken1,2,3, Jérome Brioude1, and Stéphanie Evan1 Bert Verreyken et al.
  • 1Laboratoire de l’Atmosphère et des Cyclones, UMR 8105 CNRS, University of Réunion Island, Reunion Island, France
  • 2Belgian Institute for Space Aeronomy, Ringlaan 3, B-1180 Brussels, Belgium
  • 3Ghent University, Department of Chemistry, Krijgslaan 281 - S3, B-9000 Ghent, Belgium

Abstract. The FLEXible PARTicle dispersion model FLEXPART, first released in 1998, is a Lagrangian particle dispersion model developed to simulate atmospheric transport over large and meso-scale distances. Due to FLEXPART's success and its open source nature, different limited area model versions of FLEXPART were released making it possible to run FLEXPART simulations by ingesting WRF (Weather Research Forecasting model) or MM5 (meso-scale community model maintained by Penn State university) meteorological fields on top of the ECMWF (European Centre for Medium-Range Weather Forecasts) and GFS (Global Forecast System) meteorological fields. Here, we present a new FLEXPART limited area model that is compatible with the AROME mesoscale meteorological forecast model (the Applications of Research to Operations at Meso-scale model). FLEXPART-AROME was originally developed to study meso-scale transport around La Réunion, a small volcanic island in the South West Indian Ocean with a complex orographic structure which is not well represented in current global operational models. The AROME vertical hybrid sigma grid is projected on the Cartesian terrain following FLEXPART grid. We present new turbulent modes in FLEXPART-AROME. They differ from each other by: dimensionality, mixing length parameterisation, turbulent transport constraint interpretation and a novel time-step configuration. Performances of new turbulent modes are compared to the ones in FLEXPART-WRF by testing the conservation of well-mixedness by turbulence, the dispersion of a point release at the surface and the marine boundary layer evolution around Reunion island. An adaptive time step for the vertical turbulent motions has been implemented to improve conservation of well-mixedness in the model.

Bert Verreyken et al.
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Status: open (extended)
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Bert Verreyken et al.
Bert Verreyken et al.
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Publications Copernicus
Short summary
The Lagrangian particle dispersion model FLEXPART-AROME was build to study air-mass transport around La Réunion, a volcanic island in the South West Indian Ocean. To harmonise turbulent transport between the numerical weather prediction model and the transport model, turbulent kinetic energy from AROME is directly used in FLEXPART-AROME using discrete interfaces between different turbulent regions. An adaptive time step was implemented to satisfy physical constraints on turbulent transport.
The Lagrangian particle dispersion model FLEXPART-AROME was build to study air-mass transport...