황사, 연무, 박무 현상이 미세먼지 화학조성에 미치는 영향: 2014년 제주도 고산지역 측정

Abstract

In order to examine the variation characteristics of chemical compositions in accordance with the different meteorological conditions, PM10 and PM2.5 were collected at Gosan site of Jeju Island in 2014, and then their ionic and elemental species were analyzed. The concentrations of nss-SO4 and NH4 were respectively 4.3 and 3.3 times higher in fine particle mode (PM2.5) compared to coarse particle mode (PM10-2.5), however NO3concentration was 1.6 times higher in coarse mode compared to fine particle mode. During Asian dust days, the concentrations of nssCa and NO3increased highly as 7.7 and 4.5 times in coarse particle mode, and 3.0 and 4.9 times higher in fine particles, respectively. Especially, the concentrations of the crustal species (Al, Fe, Ca, K, Mn, Ba, Sr, etc.) indicated a noticeable increase during the Asian dust days. For the haze days, the concentrations of secondary pollutants increased 2.2~2.7 and 2.9~6.0 times in coarse and fine particles, respectively, and they were 0.8~1.1 and 1.8~2.4 times, respectively, during the mist days. The aerosols were acidified largely by sulfuric and nitric acids, and neutralized mainly by ammonia in fine particle mode during the haze days, but neutralized by calcium carbonate in coarse particle mode during the Asian dust days. The clustered back trajectory analysis showed that the concentrations of nss-SO4, NO3-, and NH4 + were relatively high when the inflow pathway of air mass was from the southern part of China.