Wet Deposition: Model Development and Evaluation

The Chemistry Transport Model REM-Calgrid (RCG) has been improved by implementing a more detailed description of aqueous-phase chemistry and wet deposition processes including droplet pH. A sensitivity study on cloud and rain droplet pH has been performed to investigate its impact on model sulphate production and gas wet scavenging. Air concentrations and wet deposition fluxes of model runs applying differing droplet pH have been analysed and compared to observations. It was found that droplet pH variation within atmospheric ranges affects modelled air concentrations and wet deposition fluxes significantly.