2010년 봄철 제주지역 황사의 입경별 화학조성 특성

Abstract

The size-segregated atmospheric aerosols have been collected at Jeju island during March to May of 2010, and analyzed in order to investigate the characteristics as well as their composition changes during Asian Dust and Non-Asian Dust events. It was identified that the heaviest Asian dust occurred on the 20th of March and it had moved in Jeju area after originated in Mogolian desert and passed through the eastern China. During the Asian dust event on March 20~21, the nss-Ca2+ concentration in TSP aerosols was 7.72 μg/m3 which was 10.8 times higher compared to those of Non-Asian dust periods. And the concentrations of nss-Ca2+, NO3-, Al, Ca, Fe in PM10 were 17.5 1.8, 9.3, 8.6, 8.6 times higher, showing 11.08, 8.68, 11.91, 4.42, 9.89 μg/m3, respectively. Furthermore, the concentrations of nss-Ca2+, nss-SO42-, NO3- in PM2.5 increased 16.3, 1.1, 2.1 times showing 1.11, 7.47, 4.70 μg/m3, respectively. From the comparison of size-segregated aerosol compositions, the concentration ratios of anthropogenic nss-SO42-, NO3-, and S between Asian dust and Non-Asian dust events were 1.0, 2.7, 1.4 in fine particles, and 8.4, 2.9, 13.3 in coarse particles, respectively. Meanwhile, those of soil originated nss-Ca2+, Al, Ca, Fe were 5.3, 3.8, 12.4, 14.2 in fine particles, and 49.0, 15.2, 10.2, 15.0 in coarse particles, respectively. The number concentrations of 0.8～6.5 μm ranged particles increased highly during the first Asian dust event, even though those of 0.25～0.8 μm ranged particles did not show a noticeable change. During the second Asian dust event, the number concentrations of 0.25～0.28 μm ranged particles increased 1.6 times and those of 20.0～25.0 μm increased 30.2 times compared to those during other Non-Asian dust events.