on the multiday haze in the asian continental outflow: the important role of synoptic conditions combined with regional and local sources
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2017
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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.
| Reference Key |
seo2017atmosphericon
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|---|---|
| Authors | ;J. Seo;J. Seo;J. Y. Kim;D. Youn;J. Y. Lee;H. Kim;Y. B. Lim;Y. Kim;H. C. Jin |
| Journal | Journal of agricultural and food chemistry |
| Year | 2017 |
| DOI |
10.5194/acp-17-9311-2017
|
| URL | |
| Keywords |
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