국내 배경지역의 가스상 오염물질 장거리 이동 연구

Abstract

The concentrations of gaseous pollutants and PM10 fine particles had been measured in a real-time basis at Gosan site of Jeju Island, one of the background areas in Korea, from 2005 to 2007. The concentrations of SO2, NO2, O3, CO, and PM10 fine particles were respectively 2.13 ppb, 3.87 ppb, 38.7 ppb, 0.54 ppm, and 42.5 μg/m3 for the study period. Seasonally, the concentrations of SO2 and NO2 were highest in winter, but those of O3, CO, PM10 were highest in spring. And all of the components showed the lowest concentrations in summer. The concentration ratios of mist over non-mist events of SO2, NO2, O3, CO and PM10 were 1.2, 1.2, 1.1, 1.1, and 1.5, respectively. It showed that the concentrations of fine particles were more affected during the mist event periods compared to those of gaseous pollutants. The correlation with meteorological factors and the multiple regression analysis have resulted that SO2, NO2, and O3 have the negative correlations with the relative humidity and temperature, indicating that those concentrations decrease in summer but increase in winter and spring. The PM10 fine particles have the negative correlation with the humidity but the positive correlation with the temperature, indicating that those concentrations are assumed to increase in dry spring season. The concentration variations by wind direction resulted that those of SO2, CO, and PM10 increased in northwest wind, but no significant differences in those of O3 and NO2 by wind direction. The backward trajectory analysis showed that the concentrations of SO2, NO2, O3, CO, and PM10 increased when the air parcel moved from the northern regions of China continent, but relatively decreased when it flowed from the northern Pacific region. And it was investigated that the atmosphere in Gosan area had been highly influenced from China.