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자료유형
학술저널
저자정보
손세창 (전남대학교) 주서령 이광열 (국립환경과학원) 박승식 (전남대학교)
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한국대기환경학회 한국대기환경학회지(국문) 한국대기환경학회지 제37권 제5호
발행연도
2021.10
수록면
759 - 776 (18page)

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Chemical and light absorption characteristics of PM<SUB>2.5</SUB> during winter (Jan. 11~Feb. 21, 2020) at a Seosan site in Chungcheongnam-do were examined. During PM<SUB>2.5</SUB> pollution episode (24-hr PM<SUB>2.5</SUB>>35 μg/㎥), organic carbon (OC) and NO₃<SUP>-</SUP> were important contributors of PM<SUB>2.5</SUB>, accounting for 33 (on a organic mass basis) and 26% of PM<SUB>2.5</SUB>, respectively. Correlations of OC with elemental carbon, K<SUP>+</SUP>, Cl<SUP>-</SUP>, and SO₄<SUP>2-</SUP> suggest that the OC measured during the pollution episode was largely affected by biomass burning (BB) emissions. On the contrary, the OC during non-pollution episode was mainly associated with traffic emissions. Based on NO₃<SUP>-</SUP>/SO₄<SUP>2-</SUP> mass ratio, it was found that mobile sources (e.g., traffic emissions) contributed significantly to the formation of NO₃<SUP>-</SUP> during the pollution episode. A conditional weighted trajectory analysis indicated that PM<SUB>2.5</SUB> and NO₃<SUP>-</SUP> during study period were dominated by local pollution rather than regional transport, but SO₄<SUP>2-</SUP> was dominated by regional transport. Fe solubility, expressed as fraction of soluble Fe to total Fe, was on average 5.1% (2.1~10) and influenced by primary emissions (e.g., BB) and chemical processing of secondary acidic aerosols (SO₄<SUP>2-</SUP> and NO₃<SUP>-</SUP>), but with a greater influence from chemical processing of secondary acidic aerosol particles on enhancing the solubility of Fe. Contribution of light absorption by organic aerosols to total aerosol light absorption at 370 nm varied significantly with aerosol composition (e.g., black carbon and brown carbon). Moreover, absorption Ångström exponent values of organic aerosols estimated in the wavelength range of 370~660 nm were in the range of 2.9~4.8 with an average of 4.2, which is due to light absorption by both water-soluble and insoluble organic aerosol particles.

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Abstract
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2. 연구 방법
3. 결과 및 고찰
4. 결론
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