Yu Geun-Hye, Zhang Yan, Cho Sung-Yong, Park Seungshik
Department of Environment and Energy Engineering, Chonnam National University, Gwangju 61186, Republic of Korea.
Department of Environment and Energy Engineering, Chonnam National University, Gwangju 61186, Republic of Korea.
J Environ Sci (China). 2017 Jul;57:370-382. doi: 10.1016/j.jes.2016.10.018. Epub 2016 Dec 30.
To investigate the influence of haze on the chemical composition and formation processes of ambient aerosol particles, PM and size-segregated aerosol particles were collected daily during fall at an urban site of Gwangju, Korea. During the study period, the total concentration of secondary ionic species (SIS) contributed an average of 43.9% to the PM, whereas the contribution of SIS to the PM during the haze period was 62.3%. The NO and SO concentrations in PM during the haze period were highly elevated, being 13.4 and 5.0 times higher than those during non-haze period, respectively. The PM, NO, SO, oxalate, water-soluble organic carbon (WSOC), and humic-like substances (HULIS) had tri-modal size distributions peaks at 0.32, 1.0, and 5.2μm during the non-haze and haze periods. However, during the non-haze period they exhibited dominant size distributions at the condensation mode peaking at 0.32μm, while on October 21 when the heaviest haze event occurred, they had predominant droplet mode size distributions peaking at 1.00μm. Moreover, strong correlations of WSOC and HULIS with SO, oxalate, and K at particle sizes of <1.8μm indicate that secondary processes and emissions from biomass burning could be responsible for WSOC and HULIS formations. It was found that the factors affecting haze formation could be the local stable synoptic conditions, including the weak surface winds and high surface pressures, the long-range transportation of haze from eastern China and upwind regions of the Korean peninsula, as well as the locally emitted and produced aerosol particles.
为研究雾霾对大气气溶胶颗粒化学成分及形成过程的影响，在韩国光州一个城市站点于秋季每日采集PM及按粒径分类的气溶胶颗粒。研究期间，二次离子物种（SIS）的总浓度对PM的平均贡献率为43.9%，而在雾霾期间SIS对PM的贡献率为62.3%。雾霾期间PM中的NO和SO浓度大幅升高，分别是非雾霾期间的13.4倍和5.0倍。在非雾霾和雾霾期间，PM、NO、SO、草酸盐、水溶性有机碳（WSOC）和类腐殖质（HULIS）在0.32、1.0和5.2μm处有三模态粒径分布峰值。然而，在非雾霾期间，它们在0.32μm处的凝结模态呈现出主导粒径分布，而在10月21日发生最严重雾霾事件时，它们在1.00μm处呈现出占主导的液滴模态粒径分布。此外，在粒径<1.8μm时，WSOC和HULIS与SO、草酸盐和K之间存在强相关性，这表明二次过程和生物质燃烧排放可能是WSOC和HULIS形成的原因。研究发现，影响雾霾形成的因素可能是当地稳定的天气形势，包括微弱的地面风及高地面气压、来自中国东部和朝鲜半岛上风区域的雾霾长距离输送，以及当地排放和产生的气溶胶颗粒。
