Abstract
Abstract. The air quality of the megacities in populated and industrialized regions like East Asia is affected by both local and regional emission sources. The combined effect of regional transport and local emissions on multiday haze was investigated through a synthetic analysis of PM2. 5 sampled at both an urban site in Seoul, South Korea and an upwind background site on Deokjeok Island over the Yellow Sea during a severe multiday haze episode in late February 2014. Inorganic components and carbonaceous species of daily PM2. 5 samples were measured, and gaseous pollutants, local meteorological factors, and synoptic meteorological conditions were also determined. A dominance of fine-mode particles (PM2. 5 ∕ PM10 ∼ 0.8), a large secondary inorganic fraction (76 %), high OC ∕ EC (> 7), and highly oxidized aerosols (oxygen-to-carbon ratio of ∼ 0.6 and organic-mass-to-carbon ratio of ∼ 1.9) under relatively warm, humid, and stagnant conditions characterize the multiday haze episode in Seoul; however, the early and late stages of the episode show different chemical compositions of PM2. 5. High concentrations of sulfate in both Seoul and the upwind background in the early stage suggest a significant regional influence on the onset of the multiday haze. At the same time, high concentrations of nitrate and organic compounds in Seoul, which are local and highly correlated with meteorological factors, suggest the contribution of local emissions and secondary formation under stagnant meteorological conditions to the haze. A slow eastward-moving high-pressure system from southern China to the East China Sea induces the regional transport of aerosols and potential gaseous precursors for secondary aerosols from the North China Plain in the early stage but provides stagnant conditions conducive to the accumulation and the local formation of aerosols in the late stage. A blocking ridge over Alaska that developed during the episode hinders the zonal propagation of synoptic-scale systems and extends the haze period to several days. This study provides chemical insights into haze development sequentially by regional transport and local sources, and shows that the synoptic condition plays an important role in the dynamical evolution of long-lasting haze in the Asian continental outflow region.
Highlights
Haze is an atmospheric phenomenon causing visibility impairment that primarily results from scattering and absorbing light by particulate matter (PM) in ambient air, such as dust, smoke, and other organic and inorganic aerosols
This study provides chemical insights into haze development sequentially by regional transport and local sources, and shows that the synoptic condition plays an important role in the dynamical evolution of long-lasting haze in the Asian continental outflow region
The East Asian countries, especially China, have suffered from regional-scale prolonged haze during the cold season (Tao et al, 2012; Wang et al, 2014a; Jiang et al, 2015) and have faced serious public health and economic risks (Gao et al, 2015). Such severe long-lasting events are driven by the combination of synoptic meteorological conditions and secondary aerosol formation processes (Zhao et al, 2013; Zheng et al, 2015)
Summary
Haze is an atmospheric phenomenon causing visibility impairment that primarily results from scattering and absorbing light by particulate matter (PM) in ambient air, such as dust, smoke, and other organic and inorganic aerosols. The East Asian countries, especially China, have suffered from regional-scale prolonged haze during the cold season (Tao et al, 2012; Wang et al, 2014a; Jiang et al, 2015) and have faced serious public health and economic risks (Gao et al, 2015). Such severe long-lasting events are driven by the combination of synoptic meteorological conditions and secondary aerosol formation processes (Zhao et al, 2013; Zheng et al, 2015). Synoptic meteorological conditions conducive to the accumulation of the primary pollutants and gaseous precursors for secondary aerosols, regional transport among the megacities, and secondary aerosol formation through heterogeneous surface reactions or multiphase aqueous chemistry play critical roles in the development and sustentation of widespread and durable haze (Zhao et al, 2013; Wang et al, 2014b; Zheng et al, 2015)
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