제주 대기중 에어로졸 수농도 특성

Abstract

This study has been performed to clarify the characteristics of the temporal distribution of aerosol number concentration and to understanding the effects of Asian dust and meteorological elements on aerosol number concentration at Gosan site in Jeju island which is known as background area in Korea, from March 2010 to February 2011. The aerosol number concentration have measured with an aerodynamic particle sizer spectrometer(APS) for 30 size intervals from 0.25 ㎛ to 32.0 ㎛. The entire averaged aerosol number concentration during experimental period is about 241 particle/㎤. The aerosol number concentrations during severe-Asian dust event, Asian dust event and non-Asian dust event are dramatically decreased with increased particle size. Most of number concentration are distibuted below size range 0.5 ㎛ and the more size diameter are increased, the more aerosol number concentration are decreased. The aerosol number concentration in range of larger than 3.5 ㎛ are almost zero particle/㎤. The monthly variation in the number concentration in small particle of diameter less than 0.65 ㎛ are observed very different patterns compared with the variations in range of larger than 0.65 ㎛. And then diurnal variation in the number concentration have generally showed that the concentration in daytime lower than in nighttime over the entire size range, by the way, the difference is smaller size range(< 0.1 ㎛) are not much compared with the differences in larger than 1.0 ㎛. The entire averaged aerosol number concentration during Asian dust phenomenon in experimental period is about 341 particle/㎤. During asian dust events, the number concentration in small size ranges(≥ 0.4 ㎛) are similar to non-asian dust period. however, those in large size ranges(≥ 0.7 ㎛) are very higher than non-asian dust period. The ratio of the averaged aerosol number concentration during weak and severe Asian dust events to those during non-Asian dust period are not high in fine particle size range but they are very high in larger. The aerosol number concentrations have been hardly correlared with meteorological elements, such as visibility, cloud amount, temperature, rainfall, humidity and wind speed. For example, the correlation coeffcient between number concentration of size range 0.50?0.58 ㎛ and visibility has been 0.5 negatively, that is the highest value of correlation coeffcient in this study.