Abstract Aerosol chemistry measurements were performed during the routine monitoring periods in the urban atmosphere of Gwangju, Korea. Routine aerosol monitoring was carried out every sixth day in order to investigate the dependence of domestic sources and air mass transport characteristics on physicochemical and optical properties of atmospheric aerosol. Aerosol optical properties; atmospheric extinction and scattering coefficients were also measured continuously with a transmissometer and a nephelometer, respectively in order to investigate the causes of visibility impairment. Prevailing atmospheric condition was classified into four categories; one affected by stagnant condition (D), one affected by continental and domestic aerosols (CD), one affected by marine and domestic aerosols (MD), and one affected by continental, marine and domestic aerosols (CMD). Atmospheric condition type was further classified into thirteen sub-categories with the occurrences of episodic events such as Asian dust storm, biomass burning, and airborne pollen. The air mass types of D, CD, MD, and CMD were observed to be 11, 18, 43, and 78 events out of total 150 events, respectively. The fine mass concentration increased under continental air mass types. The average fine mass concentration of 23.0 ± 8.6 μg m−3 for CD type was slightly larger than that of 20.7 ± 5.2 μg m−3 for CMD type. Both of them were higher than that for D (18.9 ± 4.5 μg m−3) type. Increments of the fine mass concentrations for Asian dust storm (A) and Biomass-burning (B) events ranged from 141 to 151% and from 152 to 160% compared to those for D and CD types, respectively. The increments in the mass concentrations of nitrate, OC, EC, and BC for CD and CMD types in comparison with D air mass type were calculated to be approximately 17, 6, 8, and 22%, respectively. The mean mass extinction efficiency of PM10 was relatively higher in D (3.6 ± 1.6 m2 g−1) type and B events (4.1 ± 1.5 m2 g−1), but it was the lowest in MD air mass type. The aerosols observed in Gwangju were found to be influenced by the continental aerosol during the A events. Aerosol of CMD air mass type caused mainly poor visibility. The visibility reduction of Gwangju was influenced by the increase of carbonaceous particles under both domestically stagnant condition and air mass pathway from the continent. And ammonium sulfates and ammonium nitrates contributed the largest in CMD air mass type.

中文翻译：

---

韩国光州常规监测期间观测到的影响能见度气溶胶特征

摘要 在韩国光州城市大气的常规监测期间进行了气溶胶化学测量。每六天进行一次常规气溶胶监测，以研究国内来源和气团传输特征对大气气溶胶物理化学和光学特性的依赖性。气溶胶光学特性；还分别使用透射仪和浊度计连续测量大气消光系数和散射系数，以调查能见度受损的原因。主要大气条件分为四类；一种受停滞状态 (D) 的影响，一种受大陆和国内气溶胶 (CD) 的影响，一种受海洋和国内气溶胶 (MD) 的影响，一种受大陆的影响，海洋和家用气溶胶 (CMD)。大气条件类型根据亚洲沙尘暴、生物量燃烧和空气传播花粉等偶发事件的发生进一步分为13个亚类。观察到的 D、CD、MD 和 CMD 气团类型分别为 150 个事件中的 11、18、43 和 78 个事件。在大陆气团类型下精细质量浓度增加。CD 型的平均精细质量浓度为 23.0 ± 8.6 μg m-3，略大于 CMD 型的 20.7 ± 5.2 μg m-3。两者均高于 D (18.9 ± 4.5 μg m-3) 型。与 D 型和 CD 型相比，亚洲沙尘暴 (A) 和生物质燃烧 (B) 事件的精细质量浓度增加范围分别为 141% 至 151% 和 152% 至 160%。与 D 型气团相比，CD 型和 CMD 型的硝酸盐、OC、EC 和 BC 的质量浓度增量分别计算为大约 17%、6%、8% 和 22%。PM10的平均消光效率在D型（3.6±1.6 m2 g-1）和B型（4.1±1.5 m2 g-1）中相对较高，但在MD型气团中最低。发现在光州观测到的气溶胶在 A 事件期间受到大陆气溶胶的影响。CMD 气团类型的气溶胶主要导致能见度低。光州的能见度降低受到国内停滞条件和来自大陆的气团路径下碳质颗粒增加的影响。硫酸铵和硝酸铵在CMD气团类型中贡献最大。与 D 型气团相比，CD 型和 CMD 型的 BC 和 BC 分别计算为大约 17%、6%、8% 和 22%。PM10的平均消光效率在D型（3.6±1.6 m2 g-1）和B型（4.1±1.5 m2 g-1）中相对较高，但在MD型气团中最低。发现在光州观测到的气溶胶在 A 事件期间受到大陆气溶胶的影响。CMD 气团类型的气溶胶主要导致能见度低。光州的能见度降低受到国内停滞条件和来自大陆的气团路径下碳质颗粒增加的影响。硫酸铵和硝酸铵在CMD气团类型中贡献最大。与 D 型气团相比，CD 型和 CMD 型的 BC 和 BC 分别计算为大约 17%、6%、8% 和 22%。PM10的平均消光效率在D型（3.6±1.6 m2 g-1）和B型（4.1±1.5 m2 g-1）中相对较高，但在MD型气团中最低。发现在光州观测到的气溶胶在 A 事件期间受到大陆气溶胶的影响。CMD 气团类型的气溶胶主要导致能见度低。光州的能见度降低受到国内停滞条件和来自大陆的气团路径下碳质颗粒增加的影响。硫酸铵和硝酸铵在CMD气团类型中贡献最大。PM10的平均消光效率在D型（3.6±1.6 m2 g-1）和B型（4.1±1.5 m2 g-1）中相对较高，但在MD型气团中最低。发现在光州观测到的气溶胶在 A 事件期间受到大陆气溶胶的影响。CMD 气团类型的气溶胶主要导致能见度低。光州的能见度降低受到国内停滞条件和来自大陆的气团路径下碳质颗粒增加的影响。硫酸铵和硝酸铵在CMD气团类型中贡献最大。PM10 的平均消光效率在 D（3.6±1.6 m2 g-1）型和 B 型（4.1±1.5 m2 g-1）中相对较高，但在 MD 气团型中最低。发现在光州观测到的气溶胶在 A 事件期间受到大陆气溶胶的影响。CMD 气团类型的气溶胶主要导致能见度低。光州的能见度降低受到国内停滞条件和来自大陆的气团路径下碳质颗粒增加的影响。硫酸铵和硝酸铵在CMD气团类型中贡献最大。CMD 气团类型的气溶胶主要导致能见度低。光州的能见度降低受到国内停滞条件和来自大陆的气团路径下碳质颗粒增加的影响。硫酸铵和硝酸铵在CMD气团类型中贡献最大。CMD 气团类型的气溶胶主要导致能见度低。光州的能见度降低受到国内停滞条件和来自大陆的气团路径下碳质颗粒增加的影响。硫酸铵和硝酸铵在CMD气团类型中贡献最大。