Arctic aerosols play a significant role in aerosol-radiation and aerosol-cloud interactions, but ground-based measurements are insufficient to explain the interaction of aerosols and clouds in a vertically stratified Arctic atmosphere. This study shows the vertical variability of a size resolved aerosol composition via a tethered balloon system at Oliktok Point, Alaska, at different cloud layers for two representative case studies (background aerosol and polluted conditions). Multimodal microspectroscopy analysis during the background case reveals a broadening of chemically specific size distribution above the cloud top with a high abundance of sulfate particles and core-shell morphology, suggesting possible cloud processing of aerosols. The polluted case also indicates broadening of aerosol size distribution at the upper layer within the clouds with the dominance of carbonaceous particles, which suggests that the carbonaceous particles play a potential role in modulating Arctic cloud properties.

中文翻译：

---

北极上空尺寸分辨气溶胶成分的垂直梯度揭示了云中和云上的云处理气溶胶

北极气溶胶在气溶胶-辐射和气溶胶-云相互作用中起着重要作用，但地面测量不足以解释气溶胶和云在垂直分层的北极大气中的相互作用。本研究通过阿拉斯加 Oliktok 点的系留气球系统，在不同的云层显示了尺寸分辨气溶胶成分的垂直变化，用于两个代表性案例研究（背景气溶胶和污染条件）。背景案例中的多模态显微光谱分析揭示了云顶上方化学特定尺寸分布的扩大，具有高丰度的硫酸盐颗粒和核壳形态，表明可能存在气溶胶的云处理。