Effects of meteorology and emissions on urban air quality: a quantitative statistical approach to long-term records (1999-2016) in Seoul, South Korea
- Effects of meteorology and emissions on urban air quality: a quantitative statistical approach to long-term records (1999-2016) in Seoul, South Korea
- 김진영; 임용빈; 서지훈; Doo-Sun R. Park; Daeok Youn; Yumi Kim
- Issue Date
- Atmospheric chemistry and physics
- VOL 18-16137
- Together with emissions of air pollutants and precursors, meteorological conditions play important roles in local air quality through accumulation or ventilation, regional transport, and atmospheric chemistry. In this study, we extensively investigated multi-timescale meteorological effects on the urban air pollution using the long-term measurements data of PM10, SO2, NO2, CO, and O3 and meteorological variables over the period of 1999– 2016 in Seoul, South Korea. The long-term air quality data were decomposed into trend-free short-term components and long-term trends by the Kolmogorov– Zurbenko filter, and the effects of meteorology and emissions were quantitatively isolated using a multiple linear regression with meteorological variables. In terms of short-term variability, intercorrelations among the pollutants and meteorological variables and composite analysis of synoptic meteorological fields exhibited that the warm and stagnant conditions in the migratory high-pressure system are related to the high PM10 and primary pollutant, while the strong irradiance and low NO2 by high winds at the rear
of a cyclone are related to the high O3. In terms of long-term trends, decrease in PM10 (-1:75 μgm-3 yr-1) and increase in O3 (C0:88 ppb yr-1) in Seoul were largely contributed by the meteorology-related trends (-0:94 μgm-3 yr-1 for PM10 and C0:47 ppb yr-1 for O3), which were attributable to the subregional-scale wind speed increase. Comparisons with estimated local emissions and socioeconomic indices like gross domestic product (GDP) growth and fuel consumptions indicate probable influences of the 2008 global economic recession as well as the enforced regulations from the mid-2000s on the emission-related trends of PM10 and other primary pollutants. Change rates of local emissions and the transport term of long-term components calculated by the tracer continuity equation revealed a decrease in contributions o
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