선착장에서 실시간 광흡수 측정기를 이용한 초미세먼지의 광흡수 특성 (Light Absorption Characteristics of Fine Particles Using a Real-Time Optical Absorption Measurement Instrument at a Seashore Wharf)

서지정보

· 발행기관 : 한국대기환경학회
· 수록지 정보 : 한국대기환경학회지 / 35권 / 5호 / 564 ~ 576페이지
· 저자명 : 유근혜, 박승식, 이권호

초록

In this study, measurement of aerosol light absorption with 1-minute time resolution was made using a dualspot multi-wavelength aethalometer equipped with a PM2.5 impactor between October 23 and November 01, 2018 at a port of Gangneung. In addition, real-time measurements of PM10 and PM2.5 concentrations were carried out with a GRIMM light scattering monitor. Over the study period, PM10, PM2.5, black carbon (BC370) and aerosol light absorption coefficient (babs,370) at 370 nm wavelength peaked mostly in the morning (06:00~09:00) and evening hours (18:00~21:00), which are fairly coincident with activity hours of fishing boats at harbor. Furthermore, absorption Ångström exponent (AAE) values in the wavelength range of 370~520 nm (AAE370-520) and contribution of brown carbon (BrC) absorption at 370 nm (bBrC,370) to aerosol babs,370 were enhanced during the excursion. As the difference between BC370 and BC880 (BC at 880 nm) concentrations increases, the AAE370-520 values increased. During the excursion, maximum AAE370-520 and bBrC,370/babs,370 were in the range of 1.76~2.50 and 7.8~59.9%, respectively. These suggest the impact of light-absorbing organic aerosols to total aerosol light absorption at the site. Light absorption by BrC particles exhibited strong spectral dependence with increasing tendency in shorter visible wavelengths. Finally, enhanced BC370, babs,370, bBrC,370, AAE370-520, and BrC absorption contribution at 370 nm indicate the existence of light-absorbing organic aerosols in ship engine emissions at the seashore site in the absence of traffic, industrial sources, and biomass burning emissions.

영어초록

In this study, measurement of aerosol light absorption with 1-minute time resolution was made using a dualspot multi-wavelength aethalometer equipped with a PM2.5 impactor between October 23 and November 01, 2018 at a port of Gangneung. In addition, real-time measurements of PM10 and PM2.5 concentrations were carried out with a GRIMM light scattering monitor. Over the study period, PM10, PM2.5, black carbon (BC370) and aerosol light absorption coefficient (babs,370) at 370 nm wavelength peaked mostly in the morning (06:00~09:00) and evening hours (18:00~21:00), which are fairly coincident with activity hours of fishing boats at harbor. Furthermore, absorption Ångström exponent (AAE) values in the wavelength range of 370~520 nm (AAE370-520) and contribution of brown carbon (BrC) absorption at 370 nm (bBrC,370) to aerosol babs,370 were enhanced during the excursion. As the difference between BC370 and BC880 (BC at 880 nm) concentrations increases, the AAE370-520 values increased. During the excursion, maximum AAE370-520 and bBrC,370/babs,370 were in the range of 1.76~2.50 and 7.8~59.9%, respectively. These suggest the impact of light-absorbing organic aerosols to total aerosol light absorption at the site. Light absorption by BrC particles exhibited strong spectral dependence with increasing tendency in shorter visible wavelengths. Finally, enhanced BC370, babs,370, bBrC,370, AAE370-520, and BrC absorption contribution at 370 nm indicate the existence of light-absorbing organic aerosols in ship engine emissions at the seashore site in the absence of traffic, industrial sources, and biomass burning emissions.

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