Abstract Aerosol and CCN number concentrations, and aerosol size distributions in and around the Korean Peninsula were measured onboard the NASA DC-8 research aircraft during the KORUS-AQ campaign in May and June of 2016. The average and standard deviation values of total aerosol number concentrations (diameter > 10 nm, NCN10) in the boundary layer (below 1 km altitude) over Seoul, the Korean Peninsula, the Yellow Sea, the East Sea, and the South Sea were 12,318±7808, 10,721±8636, 7599±8583, 5759±6051, and 4186±4777 cm−3, respectively. Corresponding values for CCN number concentration at 0.6% supersaturation (NCCN06) were 3358±1916, 3613±2242, 3422±1707, 2313±1039, and 1819±1328 cm−3, respectively. NCN10 was highly variable according to region and period. In contrast, NCCN06 was relatively invariant regardless of region and period. With the PMF analysis on the aircraft measured aerosol size distribution and NCCN06 data, it was found that aerosol size distributions were composed of several distinct modes and they were different depending on regions. The aerosol hygroscopicity parameter κ was also estimated based on the PMF analysis results. The estimated κ values over Seoul, the Korean Peninsula, and the Yellow Sea were 0.11, 0.11, and 0.36, respectively. Lastly, the CCN closure experiments indicated that CCN concentration could be successfully estimated with the aerosol size distribution data and the estimated κ information from the aircraft measurements. Overall, it was demonstrated that PMF analysis technique could be applied to extract valuable information from limited aircraft measurement dataset.

中文翻译：

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在 KORUS-AQ 野外活动期间，在 NASA DC-8 研究飞机上测量的朝鲜半岛内和周围的亚微米气溶胶分布和 CCN 活动

摘要 在 2016 年 5 月和 6 月的 KORUS-AQ 活动期间，在 NASA DC-8 研究飞机上测量了朝鲜半岛及其周边地区的气溶胶和 CCN 数浓度以及气溶胶粒径分布。总气溶胶数的平均值和标准偏差值首尔、朝鲜半岛、黄海、东海和南海边界层（海拔 1 公里以下）的浓度（直径 > 10 nm，NCN10）分别为 12,318±7808、10,721±8636、7599±8583 、5759±6051 和 4186±4777 cm-3。0.6% 过饱和度 (NCCN06) 下 CCN 数浓度的相应值分别为 3358±1916、3613±2242、3422±1707、2313±1039 和 1819±1328 cm-3。NCN10 因地区和时期而异。相比之下，无论区域和时期如何，NCCN06 都相对不变。通过对飞机的 PMF 分析实测气溶胶粒径分布和 NCCN06 数据，发现气溶胶粒径分布由几种不同的模式组成，并且因地区而异。气溶胶吸湿性参数κ也是基于PMF分析结果估计的。首尔、朝鲜半岛和黄海的 κ 估计值分别为 0.11、0.11 和 0.36。最后，CCN 闭合实验表明，可以使用气溶胶尺寸分布数据和来自飞机测量的估计 κ 信息成功估计 CCN 浓度。总体而言，已证明 PMF 分析技术可用于从有限的飞机测量数据集中提取有价值的信息。