The Importance of the Representation of DMS Oxidation in Global Chemistry‐Climate Simulations

The oxidation of dimethyl sulfide (DMS) is key for the natural sulfate aerosol formation and its climate impact. Multiphase chemistry an important pathway but neglected in current chemistry-climate models. Here, DMS aerosol-chemistry-climate model ECHAM-HAMMOZ extended to include multiphase methane sulfonic acid (MSA) deliquesced particles, parameterized by reactive uptake. First simulations agree well with observed gas-phase MSA concentrations. implemented pathways are quantified contribute up 60% burden over Southern Ocean Arctic/Antarctic regions. While globally impact on radiative forcing almost levels off, a significantly more positive solar +0.1 W m−2 computed Arctic (>60°N). findings imply need both further laboratory studies atmospheric DMS.