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논문 기본 정보

자료유형
학술저널
저자정보
유근혜 (전남대학교) 이복진 (전남대학교) 박승식 (전남대학교) 정선아 (국립환경과학원) 조미라 (국립환경과학원) 임용재 (국립환경과학원) 김순태 (아주대학교)
저널정보
한국대기환경학회 한국대기환경학회지(국문) 한국대기환경학회지 제35권 제2호
발행연도
2019.4
수록면
195 - 213 (19page)
DOI
10.5572/KOSAE.2019.35.2.195

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초록· 키워드

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Severe hazes, which are generally characterized by high concentration level of fine particulate matter (PM<SUB>2.5</SUB>) and visibility impairment, occurring during winter have still been a great challenge in Korea. The control strategies for air pollution in Korea were not only cutting-edge issues of PM<SUB>2.5</SUB> study, but an imperative problem to be addressed to the government and the public. A severe haze event lasting approximatively 10 days occurred in February 2014 in Gwangju, Korea. Hourly measurements of PM<SUB>2.5</SUB> and its chemical constituents such as organic and elemental carbon (OC and EC), ionic species, and metal species were made at the air pollution intensive monitering station in Gwangju. Over the haze event, concentrations of three secondary ionic species (=SO₄<SUP>2-</SUP>+NO<SUB>3-</SUB>+NH<SUB>4+</SUB>) and organic matter (=OC×1.6) were on average 50.3 and 18.2% of PM<SUB>2.5</SUB>, respectively. Hourly highest concentration among the major chemical species was SO₄<SUP>2-</SUP> with the concentration of 42.7μg/m³ and contribution of 42.9% to the PM<SUB>2.5</SUB>. Organic aerosols were strongly associated with local traffic emissions, with some contribution from biomass burning activities at a rural site at northern and/or northeastern directions from the site. Another important feature found during high PM<SUB>2.5</SUB> event was that SO₂ and NO₂ concentrations were approximately 2~4 times lower in Gwangju than those in Seoul, Daejeon, and Ulsan. However, secondary ionic species concentrations in Gwangju were significantly higher than, or similar to those in other three metropolitan areas. This could possibly be attributed to high O₃ concentration (53~71 ppb) in the afternoon, enhancing the formation of SO₄<SUP>2- </SUP>and NO<SUB>3-</SUB> through photochemical reactions of SO₂ and NO₂, and finally leading to PM<SUB>2.5</SUB> increase. Over the high PM<SUB>2.5</SUB> event, SO₄<SUP>2-</SUP> and NO<SUB>3-</SUB> concentrations showed similar temporal trends, but their pollution characteristic was completely different. For example, an increasing rate in NO<SUB>3-</SUB> concentration was greatly influenced by both local secondary production and long-range transportation (LTP). Whereas, it was found that impact by LTP was likely an important factor to control the increase in SO₄<SUP>2-</SUP> concentration. In conclusion, it is suggested that cutting nitrogen oxides from vehicle emissions is a very important step to control winter haze event in Gwangju more effectively on local scale.

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

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UCI(KEPA) : I410-ECN-0101-2019-539-000680636