To determine the direct and indirect effects of aerosols on climate, it is important to know the spatial and temporal variations in cloud condensation nuclei (CCN) concentrations. Although many types of CCN measurements are available, extensive CCN measurements are challenging because of the complexity and high operating cost, especially in remote areas. As aerosol optical depth (AOD) can be readily observed by remote sensing, many attempts have been made to estimate CCN concentrations from AOD. In this study, the CCN–AOD relationship is parameterized based on CCN ground measurements from the Zeppelin Observatory (78.91° N, 11.89° E, 474 m asl) in the Arctic region. The AOD measurements were obtained from the Ny-Ålesund site (78.923° N, 11.928° E) and Modern-Era Retrospective Analysis for Research and Applications, Version 2 reanalysis. Our results show a CCN–AOD correlation with a coefficient of determination R² of 0.59. Three additional estimation models for CCN were presented based on the following data: (i) in situ aerosol chemical composition, (ii) in situ aerosol optical properties, and (iii) chemical composition of AOD obtained from reanalysis data. The results from the model using in situ aerosol optical properties reproduced the observed CCN concentration most efficiently, suggesting that the contribution of BC to CCN concentration should be considered along with that of sulfate.

为了确定气溶胶对气候的直接和间接影响，了解云凝结核 (CCN) 浓度的空间和时间变化非常重要。尽管有多种类型的 CCN 测量可用，但由于复杂性和高运营成本，广泛的 CCN 测量具有挑战性，尤其是在偏远地区。由于气溶胶光学深度 (AOD) 可以很容易地通过遥感观测到，因此已经进行了许多尝试来估计 AOD 中的 CCN 浓度。在这项研究中，CCN-AOD 关系是基于来自北极地区齐柏林天文台（北纬 78.91°，东经 11.89°，海拔 474 米）的 CCN 地面测量值参数化的。AOD 测量值来自 Ny-Ålesund 站点 (78.923° N, 11.928° E) 和 Modern-Era Retrospective Analysis for Research and Applications，第 2 版再分析。²的 0.59。基于以下数据提出了三个额外的 CCN 估计模型：(i) 原位气溶胶化学成分，(ii) 原位气溶胶光学特性，以及 (iii) 从再分析数据中获得的 AOD 化学成分。使用原位气溶胶光学特性的模型结果最有效地再现了观察到的 CCN 浓度，这表明 BC 对 CCN 浓度的贡献应与硫酸盐一起考虑。