The interactions between SO and natural salt aerosol particles represent complex and crucial dynamics within atmospheric processes and the broader climate system. This study investigated the SO uptake, hygroscopicity, morphology and mixing states of natural salt particles, which are generated from brines sampled from the Chaka salt lake located in the Qinghai-Tibet plateau. A comparison with atomized pure NaCl particles is included as reference. The results show that NaCl particles exhibit the lowest SO uptake, while Chaka salt particles demonstrate higher uptake due to their complex composition. The hygroscopicity of salt particles is influenced by several factors, including chemical complexity, SO exposure and light conditions. In comparison to pure NaCl, Chaka salt displays higher hygroscopicity, which is further enhanced in the presence of SO. However, when exposed to light, mass growth is suppressed, suggesting the formation of species with lower hygroscopicity, such as NaSO. Analysis of particle morphology and mixing states reveals notable distinctions between NaCl crystals and Chaka salt particles, where the Chaka salt particles exhibit rounded shapes with a structure composed of cubic NaCl cores surrounded by sulfate materials as a coating. In addition, the chemical morphology analysis also reveals that the particles show morphological and spectral changes before and after the exposure to SO, light and high RH. Therefore, this research highlights the intricate interactions between SO and natural salt aerosol particles in diverse environmental settings, underscoring their multifaceted impacts on atmospheric processes.

中文翻译：

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SO2和光对天然盐气溶胶化学形态和吸湿性的影响

SO 和天然盐气溶胶颗粒之间的相互作用代表了大气过程和更广泛的气候系统中复杂而关键的动态。本研究调查了青藏高原茶卡盐湖卤水中产生的天然盐颗粒的 SO 吸收、吸湿性、形态和混合状态。与雾化纯 NaCl 颗粒的比较作为参考。结果表明，氯化钠颗粒表现出最低的 SO 吸收量，而茶卡盐颗粒由于其复杂的成分而表现出较高的吸收量。盐颗粒的吸湿性受多种因素影响，包括化学复杂性、SO 暴露和光照条件。与纯 NaCl 相比，茶卡盐表现出更高的吸湿性，在 SO 存在下进一步增强。然而，当暴露在光下时，质量生长受到抑制，这表明形成了吸湿性较低的物质，例如 NaSO。对颗粒形态和混合状态的分析揭示了 NaCl 晶体和茶卡盐颗粒之间的显着区别，其中茶卡盐颗粒呈圆形，其结构由立方 NaCl 核心组成，周围有硫酸盐材料作为涂层。此外，化学形态分析还表明，颗粒在暴露于SO、光和高RH之前和之后表现出形态和光谱变化。因此，这项研究强调了不同环境背景下二氧化硫和天然盐气溶胶颗粒之间复杂的相互作用，强调了它们对大气过程的多方面影响。