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

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