The following list provides an overview of the context of each file in the dataset: Aerosol composition aerosol_composition_daily.nc: Provides the model output of the inorganic aerosol composition (sulfate, nitrate, ammonium, chloride) calculated by AERCHEM and ISORROPIA-II as daily averages for 2010 aerosol_composition_yearly.nc: Provides the 2010 yearly averaged surface inorganic aerosol composition (sulfate, nitrate, ammonium, chloride) for AERCHEM and ISORROPIA-II used to create Figure 2 Aerosol acidity aerosol_acidity_5hourly.nc: Provides instantaneous 5 hourly model output calculated by AERCHEM and ISORROPIA-II needed to calculate aerosol acidity for 2010 aerosol_acidity_yearly.nc: Provides the 2010 yearly averaged surface aerosol acidity for AERCHEM and ISORROPIA-II used to create Figure 3, S1, and S2

The AERosol CHEMistry (GMXe-AERCHEM, v1.0) sub-submodel was developed for the Modular Earth Submodel System (MESSy) as an add-on to the thermodynamic equilibrium model (i.e., ISORROPIA-II) used by MESSy's Global Modal-aerosol eXtension (GMXe) submodel. AERCHEM allows the representation of non-equilibrium aqueous-phase chemistry of varying complexity in deliquescent fine aerosols. The model code used to create this dataset is archived at DOI:10.5281/zenodo.10036115.

This dataset contains the output of the ECHAM/MESSy Atmospheric Chemistry (EMAC) model simulation analyzed in the work "How non-equilibrium aerosol chemistry impacts particle acidity: the GMXe AERosol CHEMistry (GMXe-AERCHEM, v1.0) sub-submodel of MESSy" submitted to Geoscientific Model Development.