Summary
Recent studies have suggested that particulate nitrate (NO3–) photolysis could be an important source of atmospheric oxidants, and one of its main products, N(III), contributes to the heterogeneous formation of sulfate (SO42–) in aerosol water─a potential missing source of SO42– in polluted environments. However, its effects on SO42–and air quality in different regions remain unexplored. In this study, we implement a detailed model representation of SO42– formation via NO3– photolysis into the global chemical transport model GEOS-Chem. Our results find considerable impacts of NO3– photolysis on surface SO42–, especially over India and other coastal regions (up to 15% increment of annual average concentrations), which were previously unaccounted for in most models. The effects are mainly du
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