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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2019.3
- 수록면
- 159 - 172 (14page)
이용수
초록· 키워드
오류제보하기
To investigate the influence of pollution events on the chemical composition and formation processes of aerosol particles, 24-h integrated size-segregated particulate matter (PM) was collected during the fall season at an urban site of Gwangju, Korea and was used to determine the concentrations of mass, water-soluble organic carbon (WSOC) and ionic species. Furthermore, black carbon (BC) concentrations were observed with an aethalometer. The entire sampling period was classified into four periods, i.e., typical, pollution event I, pollution event II, and an Asian dust event. Stable meteorological conditions (e.g., low wind speed, high surface pressure, and high relative humidity) observed during the two pollution events led to accumulation of aerosol particles and increased formation of secondary organic and inorganic aerosol species, thus causing PM<SUB>2.5</SUB> increase. Furthermore, these stable conditions resulted in the predominant condensation or droplet mode size distributions of PM, WSOC, NO₃-, and SO₄<SUP>2-</SUP>. However, difference in the accumulation mode size distributions of secondary water-soluble species between pollution events I and II could be attributed to the difference in transport pathways of air masses from high-pollution regions and the formation processes for the secondary chemical species. The average absorption Ångström exponent (AAE370-950) for 370-950 nm wavelengths > 1.0 indicates that the BC particles from traffic emissions were likely mixed with light absorbing brown carbon (BrC) from biomass burning (BB) emissions. It was found that light absorption by BrC in the near UV range was affected by both secondary organic aerosol and BB emissions. Overall, the pollution events observed during fall at the study site can be due to the synergy of unfavorable meteorological conditions, enhanced secondary formation, local emissions, and long-range transportation of air masses from upwind polluted areas.
목차
ABSTRACT
1. Introduction
2. Experimental Section
3. Results and Discussion
4. Conclusions
References
참고문헌 (57)
참고문헌 신청
Bae MS, Shin JS, Lee KY, Lee KH, Kim YJ. Long-range transport of biomass burning emissions based on organic molecular markers and carbonaceous thermal distribution. Sci. Total Environ. 2014;466:56-66.
Yu G, Park S, Lee K. Source contributions and potential source regions of size-resolved water-soluble organic carbon measured at an urban site over one year. Environ. Sci. Proc. Imp. 2016;18:1343-1358.
Yu G, Zhang Y, Cho SY, Park S. Influence of haze pollution on water-soluble chemical species in PM2.5 and size-resolved particles at an urban site during fall. J. Environ. Sci. 2017;57:370-382.
Park S, Schauer J, Cho S. Sources and their contributions to two water-soluble organic carbons observed at a roadway site. Atmos. Environ. 2013;77:348-357.
Park S, Cho S, Bae M. Source identification of water-soluble organic aerosols at a roadway site using a positive matrix factorization analysis. Sci. Total Environ. 2015;533:410-421.
Yu G, Park S, Lee K. Source contributions and potential source regions of size-resolved water-soluble organic carbon measured at an urban site over one year. Environ. Sci. Proc. Imp. 2016;18:1343-1358.
Yu G, Zhang Y, Cho SY, Park S. Influence of haze pollution on water-soluble chemical species in PM2.5 and size-resolved particles at an urban site during fall. J. Environ. Sci. 2017;57:370-382.
Park S, Schauer J, Cho S. Sources and their contributions to two water-soluble organic carbons observed at a roadway site. Atmos. Environ. 2013;77:348-357.
Park S, Cho S, Bae M. Source identification of water-soluble organic aerosols at a roadway site using a positive matrix factorization analysis. Sci. Total Environ. 2015;533:410-421.
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UCI(KEPA) : I410-ECN-0101-2019-539-000032909