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 larg...

Abstract We investigate the impact of resolving air-sea interaction on simulation intraseasonal rainfall variability over South Pacific using ECHAM5 atmospheric general circulation model coupled with Snow-Ice-Thermocline (SIT) ocean model. compare fully two uncoupled simulations, one forced sea surface temperature (SST) climatology and daily SST from The is reduced by 17% in increased 8% SST, s...

A new parameterization with three prognostic liquid water classes was implemented into the general circulation model (GCM) ECHAM5 with the aerosol module HAM in order to improve the global representation of rain formation in marine stratiform clouds. The additionally introduced drizzle class improves the physical representation of the droplet spectrum and, more importantly, improves the microph...

The representation of cloud and precipitation chemistry and subsequent wet deposition of trace constituents in global atmospheric chemistry models is associated with large uncertainties. To improve the simulated trace gas distributions we apply the new submodel SCAV, which includes detailed cloud and precipitation chemistry and present results of the atmospheric chemistry general circulation mo...