This computation involved: ECHAM/MESSy Atmospheric Chemistry (EMAC) Numerical Model System deployed on DLR (German Institute for Atmospheric Physics) Computers. ECHAM/MESSy Atmospheric Chemistry (EMAC) numerical model system is a climate model with atmospheric chemistry modules, run in atmosphere-only mode; i.e. the model is driven by sea-surface temperature (SST) and sea-ice concentrations (SICs).

The model explores how changes in the levels and locations of ozone precursor emissions, (such as nitrogen oxides NO and NO; referred to as NO, carbon monoxide (CO) and volatile organic compounds (VOCs), including methane, could tropospheric ozone abundances, from the pre-industrial period to future projections.

The German Institute for Atmopsheric Physics (DLR) is based in Oberpfaffenhofen, Germany. It focusses on the research of the physical and chemical processes of the troposphere and lower stratosphere. The global climate model ECHAM has been developed at the DLR, and based on ECHAM, more complex interactively coupled model systems have been developed, including other components of the climate system: Ocean-Atmosphere models, atmosphere models including the sulfur cycle, etc.

Several model versions are currently used operationally: ECHAM4 has been used since 1996, ECHAM5 has been made available at the begin of 2004. ECHAM4 has also been available with higher vertical resolution (ECHAM4.L39(DLR)) or with an upward shifted model top at 0.1 hPa (MA-ECHAM4).
ECHAM is used to simulate the development of global weather (temperature, wind, clouds, etc.), using a spatial resolution of between 300 km and 500 km and a time step of between 20 min and 40 min, depending on model version.