numerical models


GLOBO is a grid-point hydrostatic general circulation model on a uniform mesh in geographic coordinates. GLOBO was developed as an evolution of BOLAM, with the same numerics for the dynamical part and the same physical parameterizations.


MILORD is a 3-D long-range Lagrangian particle model. Transport and dispersion of pollutants or tracers are simulated by following the trajectories of virtual particles, each representing a finite mass and/or activity of the substance considered, in a three dimensional wind field (ECMWF analyses). Diffusion due to turbulence is prescribed by integrating the Langevin equation for displacement. Depletion of the mass particle by dry and wet deposition and radioactive decay or chemical transformation are accounted for by exponential reduction equations.


BOLAM is a limited-area hydrostatic model based on the primitive equations with parameterization of convection and other sub-grid physics (radiation, diffusion, cloud, soil). Daily runs, on a grid of 0.075 degrees (8.3 km) on the area shown in the image, are on display on the forecast page of ISAC, where more information can be found.


BOLCHEM is a Coupled Composition and Meteorology Model (CCMM) in which meteorology component is borrowed from BOLAM that also accounts for advection and diffusion of atmospheric components. The composition part consists of several modules that take care of other processes (sedimentation, dry deposition, wet removal, natural source emissions, ...) and that complement two mechanisms for gas chemistry (SAPRC90, Carter, 1990) and aerosol dynamics (AERO3, Binkowski et al., 2003).


MOLOCH is a non-hydrostatic limited-area model that integrates the fully compressible dynamical equations with parameterized diffusion, radiation, soil physics and cloud microphysics. As a convection-permitting model, it is designed to operate at resolutions coarser than the "grey area" of sub-km grid size.


SPRAY is a three dimensional model designed to simulate the airborne pollutant dispersion, able to take into account the spatial and temporal inhomogeneities of both the mean flow and turbulence. Concentration fields generated by point, areal or volume sources can be simulated by the model.


MicroSpray is a microscale Lagrangian particle model derived from SPRAY code and able to take into account the presence of obstacles. Microspray is especially oriented to deal with gas dispersion in urban environment and industrial sites.

RMS and MicroRMS

RMS and MicroRMS are modelling suites composed by the known atmospheric model RAMS, the boundary-layer parameterization code MIRS and the Lagrangian particle model (Micro)Spray. MIRS (Model for Interfacing RAMS and SPRAY) processes the meteorological RAMS output fields or, alternatively, other kinds of data fields deriving by observations or diagnostic models, then calculates the boundary-layer quantities and the Lagrangian turbulence fields.