Particulate PAHs levels at Mt. Halla site in Jeju Island, Korea: Regional background levels in northeast Asia
Particulate PAHs levels at Mt. Halla site in Jeju Island, Korea: Regional background levels in northeast Asia
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DOI：
10.1016/j.atmosres.2008.04.005
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发表时间：
2008-10-01
影响因子：
5.5
通讯作者：
Kang, Chang-Hee
中科院分区：
文献类型：
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作者：
Lee, Ji Yi;Kim, Yong Pyo;Kang, Chang-Hee
1999 年 3 月至 2002 年 3 月期间，对韩国济州岛汉拿山场地的 PM.25 PAH 浓度进行了观测。由于亚洲化石燃料使用的季节性变化，与附近沿海背景场地高山类似，在寒冷季节观察到高浓度颗粒物 PAH 浓度的季节性变化。环境颗粒物多环芳烃总平均浓度为404 579 pg m(-3)，比高山环境水平低约一个数量级。然而，汉拿山和高山之间的人为无机离子浓度之比较小，非海盐（nss）硫酸盐为1.5，硝酸盐为2.7。对这些特征的两种可能的解释是（1）两个地点测量了不同的空气块和/或（2）两个地点的当地排放影响不同。根据高山的Bep/BaP比值结果、高空风向数据、后向轨迹分析和LIDAR测量数据，发现当地排放对采样点的影响程度是造成两个地点PAHs水平不同的主要原因，尽管在某些情况下，到达汉拿山的空气团与到达高山的空气团不同。对于次生气溶胶，例如 nss 硫酸盐，较低的浓度差表明两个地点都受到区域运输的影响。它指出，高山的多环芳烃等直接排放物种的测量结果可能会受到当地排放的显着影响。 (c) 2008 Elsevier B.V. 保留所有权利。
The levels of PM.25 PAHs at Mt. Halla site, Jeju Island, a background site in Korea were observed between March 1999 and March 2002. A seasonal variation was observed for the particulate PAHs concentrations with high levels during cold season similar to Gosan, a nearby coastal background site, due to the seasonal variations of fossil fuel usage in Asia. The total average concentration of ambient particulate PAHs was 404 579 pg m(-3), about one order lower than the ambient level at Gosan. However, the ratios of the anthropogenic inorganic ion concentrations between Mt. Halla and Gosan were smaller, 1.5 for non sea-salt (nss) sulfate and 2.7 for nitrate. Two possible explanations for these characteristics are (1) two sites measured different air parcels and/or (2) the effect of local emissions were different at two sites. Based on the Bep/BaP ratio result, upper air wind direction data, backward trajectory analysis, and LIDAR measurement data at Gosan, it was found that the degree of the effects of local emissions to the sampling sites be the major reason for the different PAHs levels at two sites though, in some cases, the air parcels arriving at Mt. Halla were different from those arriving at Gosan. For secondary aerosol such as nss sulfate, the lower concentration difference indicates both site are affected by regional transport. It points that the measurement result for directly emitted species such as PAHs at Gosan might be significantly influenced by local emissions. (c) 2008 Elsevier B.V. All rights reserved.