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. An updated and expanded representation of organics in the chemistry general circulation model EMAC(ECHAM5/MESSy for Atmospheric Chemistry) has been evaluated. First, thecomprehensive Mainz Organic Mechanism (MOM)in the submodel MECCA (Module Efficiently Calculating the Chemistry of the Atmosphere) was activated withexplicit degradation of organic species up to five carbon atoms and asimplified mechanism for larger molecules. Second, the ORACLE submodel (version 1.0)now considers condensation on aerosols for allorganics in the mechanism. Parameterizations for aerosol yields are used only for the lumped speciesthat are not included in the explicit mechanism.The simultaneous usage of MOM and ORACLEallows an efficient estimation of not only the chemical degradation ofthe simulated volatile organic compounds but also the contributionof organics to the growth and fate of (organic) aerosol,with the complexity of the mechanism largely increasedcompared to EMAC simulations with more simplified chemistry.The model evaluation presented here reveals that the OH concentration is reproduced well globally,whereas significant biases for observed oxygenated organics are present.We also investigate the general propertiesof the aerosols and their composition, showing that the moresophisticated and process-oriented secondary aerosol formation does notdegrade the good agreement of previous model configurations with observations at the surface,allowing further research in the field of gas–aerosol interactions.

Simulation of organics in the atmosphere: evaluation of EMACv2.54 with the Mainz Organic Mechanism (MOM) coupled to the ORACLE (v1.0) submodel