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The AeroCom exercise diagnoses multi-component aerosol modules in globalmodeling. In an initial assessment simulated global distributions for massand mid-visible aerosol optical thickness (aot) were compared among 20different modules. Model diversity was also explored in the context ofprevious comparisons. For the component combined aot general agreement hasimproved for the annual global mean. At 0.11 to 0.14, simulated aot valuesare at the lower end of global averages suggested by remote sensing fromground (AERONET ca. 0.135) and space (satellite composite ca. 0.15). Moredetailed comparisons, however, reveal that larger differences in regionaldistribution and significant differences in compositional mixture remain. Ofparticular concern are large model diversities for contributions by dust andcarbonaceous aerosol, because they lead to significant uncertainty inaerosol absorption (aab). Since aot and aab, both, influence the aerosolimpact on the radiative energy-balance, the aerosol (direct) forcinguncertainty in modeling is larger than differences in aot might suggest. Newdiagnostic approaches are proposed to trace model differences in terms ofaerosol processing and transport: These include the prescription of commoninput (e.g. amount, size and injection of aerosol component emissions) andthe use of observational capabilities from ground (e.g. measurementsnetworks) or space (e.g. correlations between aerosol and clouds)

An AeroCom initial assessment – optical properties in aerosol component modules of global models