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. The presence of organic sulfur compounds (OS) at the water surface acting as organic surfactants, may influence the air-water interaction and contribute to new particle formation in the atmosphere. However, the impact of ubiquitous anthropogenic pollutant emissions, such as SO2 and polycyclic aromatic hydrocarbons (PAHs) on the formation of OS at the air-water interface still remains unknown. Here, we observe large amounts of OS formation in the presence of SO2, upon irradiation of aqueous solutionscontaining typical PAHs, such as pyrene (PYR), fluoranthene (FLA), andphenanthrene (PHE) as well as dimethylsulfoxide (DMSO). We observe rapidformation of several gaseous OSs from light-induced heterogeneous reactionsof SO2 with either DMSO or a mixture of PAHs and DMSO (PAHs/DMSO), and some of theseOSs (e.g. methanesulfonic acid) are well established secondary organicaerosol (SOA) precursors. A myriad of OSs and unsaturated compounds areproduced and detected in the aqueous phase. The tentative reaction pathwaysare supported by theoretical calculations of the Gibbs energy of reactions.Our findings provide new insights into potential sources and formationpathways of OSs occurring at the water (sea, lake, river) surface, thatshould be considered in future model studies for a better representation of theair-water interaction and SOA formation processes.

atmospheric chemistry and physics

Formation of organic sulfur compounds through SO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;-initiated photochemistry of PAHs and dimethylsulfoxide at the air-water interface