The Influence of Cloud Chemical Processes on the Formation of Secondary Particulate Matter
As a pre-study for the 3-D-simulation of the hill cap cloud experiment HCCT 2010 the chemistry transport model COSMO-MUSCAT was tested in a 2-D-domain with a bell-shaped hill. The sensitivity of several target species (oxidants, pH, sulphate, organic mass, dicarboxylic acids, O/C-ratio) on the detail of the aqueous phase mechanism was investigated in a polluted urban and a clean continental rural air mass. For the treatment of aqueous phase chemistry the complex mechanism CAPRAM 3.0i in reduced version and the simple inorganic mechanism INORG was used. Differences between both mechanisms occurred for the oxidants which are not treated in INORG (HO2, OH, NO3) and the pH especially in the urban environment where much more organic reaction partners are also present in the aqueous phase. For O3, H2O2 and the overall sulphate mass both mechanisms agree mostly within 5 %. Additionally, the composition of the organic mass has been analysed.
KeywordsPyruvic Acid Liquid Water Content Organic Mass Nitrate Production Sulphate Mass
R.S. acknowledges personal funding by the scholarship program of the German Federal Environmental Foundation (DBU). The ZIH Dresden and the NIC Jülich supported this work. We gratefully acknowledge the DWD Offenbach for good cooperation.
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