ATLAS: ATMOSPHERIC LAGRANGIAN DISPERSION MODEL. ALCANCES E INNOVACIONES PARA LA GEOLOGÍA

VIRAMONTE JOSE; ARNAU FOLCH; FLORENCIA RECKZIEGEL

Tucumán

Congreso; XX Congreso Geológico Argentino; 2017

ATLAS: Atmospheric Lagrangian dispersion model. Scopes and innovations for geology. ATLAS (AtmosphericLAgrangiandi Spersion), is a new Lagrangian model to calculate the dispersal of volcanic pollutants, designed fromscratch to be parallelized in general purpose and hybrid hardware architectures to minimize the model executioncost. The model solves the Advection-Diffusion-Sedimentation equation on multiple scales (global to regional) andcan be driven by different meteorological models in combination. For example, on a large domain, data from themesoscale Weather Research Forecast (WRF) model can be combined with data from the Global Forecast System(GFS) model so that ATLAS automatically switch to select the highest resolution data available at any given region.The model can be used both in forward mode to forecast ash dispersal form a volcano or a virtual (extended) sourceand in backwards trajectory mode to constrain unknown source characteristics. More than one source term can bedefined, simulating the particles trajectories and dispersion with different granulometries, at the same execution. Inaddition, the code has been designed to include, in a near future, the possibility of ensemble forecasts assimilatingdata from satellite retrievals to redefine the ensemble members on different assimilation cycles.