The chemistry of trace sulfur gases in planetary organic haze formation is poorly understood, though both are ubiquitous in planetary atmospheres. Here, we perform laboratory studies to explore how the addition of trace amounts of H₂S (0.5–5 ppmv) affects organic aerosol produced from ultraviolet photochemistry of CH₄ in N₂. We analyze the aerosol product composition and size in real time. Inclusion of trace amounts of H₂S in the precursor mixture significantly enhances the formation of organic aerosol mass and the particle effective density, both of which increase as a function of initial H₂S concentration and in the absence of an additional carbon source. We further present evidence that the addition of trace H₂S to the precursor mixtures leads to the formation of organosulfur compounds. Their inclusion in the aerosol-phase contributes to the organic aerosol mass enhancement. Thiyl-alkene chemistry is proposed as a possible organosulfur formation mechanism. In contrast to previous assumptions that sulfur and carbon chemistry occur largely independently of each other, these results suggest a coupling between the two chemistries. This coupling has potential impacts on organic haze and atmospheric sulfur chemistry in planetary atmospheres.

中文翻译：

---

硫化氢对甲烷/氮气氛中光化学雾度形成的影响

尽管行星大气中普遍存在两种微量的硫气，但人们对行星有机雾气中痕量硫的化学反应却知之甚少。在这里，我们进行实验室研究，以探讨微量H ₂ S（0.5-5 ppmv）的添加如何影响N ₂中CH _4的紫外光化学产生的有机气溶胶。我们实时分析气雾剂产品的成分和大小。前体混合物中包含痕量的H ₂ S显着增强了有机气溶胶物质的形成和颗粒的有效密度，二者均随初始H _2的增加而增加S浓度且没有其他碳源。我们进一步提供的证据表明，向前体混合物中添加痕量H ₂ S会导致有机硫化合物的形成。它们包含在气溶胶相中有助于提高有机气溶胶的质量。提出了巯基-烯烃化学作为可能的有机硫形成机理。与先前的假设硫和碳的化学作用很大程度上彼此独立的相反，这些结果表明两种化学作用之间存在耦合。这种耦合对行星大气中的有机雾度和大气硫化学有潜在的影响。