이차 에어러솔 생성 잠재력 평가를 위한 Potential Aerosol Mass (PAM) 챔버의 제주도 고산 대기분석 적용

Abstract

The secondary aerosol forming potential of ambient air was first measured with the Potential Aerosol Mass(PAM)chamber at Gosan supersite on Jeju island from October 22 to November 5, 2010. PAM chamber is a small flowthrough photo-oxidation chamber with extremely high OH and O3 levels. The OH exposure in the PAM chamber was (2±0.4)×1011~(6±1.2)×1011 molecules cm-3 s and was similar to 2 to 5 days of aging in the atmosphere. By periodically turning on and off UV lamps in the PAM chamber, ambient aerosol and newly formed aerosol (e.g. called as PAM aerosol) was alternately measured. Aerosol number and mass concentration in the range of 10~487nm in diameter was measured by SMPS 3034. With UV lamps on, the nucleation mode particles smaller than 50nm in diameters were formed. Their number concentration was greater than 105 cm-3, leading to increase in aerosol mass by 0~8 μg m-3. The variations of PAM and ambient aerosols were greatly dependent on characteristics of air masses such as precursor concentrations and degree of aging. This preliminary results suggests that PAM chamber is useful to assess the aerosol formation potential of air mass and its impact on the air quality. The further analysis of data with gaseous and particulate measurements will be done.