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논문 기본 정보

자료유형
학술저널
저자정보
유근혜 (전남대학교) 박승식 (전남대학교) 정선아 (국립환경과학원) 조미라 (국립환경과학원) 임용재 (국립환경과학원) 이상일 (한국표준과학연구원)
저널정보
한국대기환경학회 한국대기환경학회지(국문) 한국대기환경학회지 제35권 제3호
발행연도
2019.6
수록면
395 - 403 (9page)
DOI
10.5572/KOSAE.2019.35.3.395

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초록· 키워드

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Carbonaceous aerosols contribute a significant fraction to PM<SUB>2.5</SUB>, and play important roles in the radiative forcing of the Earth and in global climate change, accordingly requiring their accurate measurements. Highly time-resolved measurements of carbonaceous components in PM<SUB>2.5</SUB> have been made to better understand their emission characteristics and dynamics of secondary organic aerosol (SOA) formation. However, an accuracy of carbonaceous aerosol data from the high time-resolution measurements should be evaluated to provide accurate estimation of their emission sources, SOA dynamics, and the global climate forcing. In this study, hourly concentrations of organic and elemental carbon (OC and EC) in PM<SUB>2.5</SUB> were measured at the air pollution intensive monitoring station in Gwangju for two intensive observation periods (IOPs) (January 15~February 10 and March 11~April 08, 2018) using a semi-continuous carbon analyzer based on the NIOSH method 5040. Additionally, 24-hr filter samples during the two IOPs were collected and analyzed for OC and EC determination to evaluate the accuracy of the hourly OC and EC measurements. Diurnal averages of OC and EC were characterized by pronounced peaks in the morning and evening rush hours, indicating common sources of two carbon components. A comparison between semi-continuous and filter-based carbon measurements indicates that semi-continuous OC concentrations were approximately 27% lower than 24-hr integrated OC concentrations. While semi-continuous EC was approximately 1.0~1.2 times higher than 24-hr integrated EC. Lower concentrations of OC in the semi-continuous measurements were attributed to higher face velocity of air passing through the filters (111.1 vs. 20.1 cm/s), the different NIOSH temperature programs and residence times, or to OC-EC split time. The discrepancy for the EC data was likely attributed to the high detection limit of EC in the semi-continuous carbon analyzer, difference in the temperature programs, and the OC-EC split time. In conclusion, it is suggested that OC and EC from semi-continuous carbon analyzer need corrections to examine accurately the mass balance closure of PM<SUB>2.5</SUB> and to estimate the relative contribution of carbonaceous particles to the PM<SUB>2.5</SUB>.

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Abstract
1. 서론
2. 실험 방법
3. 결과 및 고찰
4. 요약 및 결론
References

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