Evaluation of the New Version of Stratospheric Chemistry Module of the SILAM CTM

Abstract

The effect of different bromine and chlorine species on ozone is here evaluated using a System for Integrated modeLling of Atmospheric coMposition, SILAM. The new stratospheric chemistry module includes 15 chlorine and 9 bromine species together with their gas-phase and heterogeneous reactions with other species. Evaluation of ozone concentrations is obtained by using the steady-state, which is obtained after spin-up time of several decades. The amount of halogens is estimated by including bromine emissions from sea (e.g. sea-salt), from biomass burning and from terrestrial sources. For chlorine we used the emissions from the GEIA inventory, with additional yearly scaling of the different CFC emissions.