Technical Note: The air quality modeling system Polyphemus
1ENPC-CEREA, joint research laboratory École Nationale des Ponts et Chaussées/EDF R&D, 6–8 avenue Blaise Pascal, Champs-sur-Marne, 77455 Marne-la-Vallée Cedex 2, France
2CLIME Project, INRIA/ENPC, INRIA Rocquencourt, Domaine de Voluceau, BP 105, 78153 Le Chesnay CEDEX, France
3IRSN, BP 17, 92262 Fontenay-aux-Roses Cedex, France
Abstract. Polyphemus is an air quality modeling platform which aims at covering the scope and the abilities of modern air quality systems. It deals with applications from local scale to continental scale, using two Gaussian models and two Eulerian models. It manages passive tracers, radioactive decay, photochemistry and aerosol dynamics. The structure of the system includes four independent levels with data management, physical parameterizations, numerical solvers and high-level methods such as data assimilation. This enables sensitivity and uncertainty analysis, primarily through multimodel approaches. On top of the models, drivers implement advanced methods such as model coupling or data assimilation.