A Long-Term Re-Analysis of Atmospheric Composition and Air Quality

The paper presents a global-to-mesoscale model re-analysis of atmospheric composition for the period of 1980-2014 and the first outcome of the evaluation. The goals of the re-analysis were to assess the multi-decade evolution of atmospheric composition and air quality at several spatial scales and to evaluate the performance of SILAM dispersion model in this large-scale exercise. The dataset covered troposphere and the stratosphere, main anthropogenic pollutants and had a special line for natural constituents, such as sea salt and pollen. This dataset forms the starting point for episodic and meso-to-local-scale studies, which will refine its predictions.