2006년 한라산 1100 고지 대기 에어로졸의 입경별 조성 특성

Abstract

Total suspended particles (TSP), fine particles with aerodynamic diameter less than 2.5 μm (PM_(2.5)) and size-segregated aerosols were collected at the 1100 Site of Mt. Halla, Jeju island in 2006, and analyzed in order to understand the chemical characteristics of atmospheric aerosols. The concentrations of water-soluble components of TSP aerosols were in the order of nss-SO₄^(2-) > NH₄^(+) > NO₃^(-) > Na^(+) > nss-Ca^(2+) > K^(+) > Cl^(-) > Mg^(2+), and those of metal and sulfur elements were in the order of S > Al > Fe > Ca > Mg > Na > K > Zn > Pb > Mn > Ti > Ba > V > Cu > Sr > Cr > Ni > Co > Cd > Mo. The order of concentrations of ionic species in PM2.5 were similar with them in TSP. Nss-SO₄^(2-) and NH4+ were mostly in the fine mode (< 2.1 μm), but NO₃^(-) and nss-Ca^(2+) were distributed in the coarse mode, with the range of 2.1～3.3 μm and 4.7～5.8 μm each other. Generally, Na, Al, Fe, and Ca originated mainly from soil and marine sources were also in the coarse mode. Meanwhile, S, Zn, and Pb influenced by anthropogenic pollution sources were existed mostly in the fine particles. According to soil and seawater enrichment factors, Cl^(-) and Mg^(2+) were mostly originated from sea salt particles, and Al, Ca and Fe were from soil particles. However the other components in aerosols were originated from another sources. The results showed that, of the ionic species, the concentrations of Na^(+), K^(+), nss-Ca^(2+), NO₃^(-), and Cl^(-) were 4.4, 3.1, 3.1, 2.0, 6.2 times higher during Asian Dust periods than those during Non-Asian Dust periods. During Asian dust periods, concentrations of S, Al, Ca, Fe, and K also increased 1.5, 3.3, 4.2, 3.5, 3.0 times, respectively. From the factor analysis, the atmospheric aerosols at 1100 Site were largely influenced by soil sources (37.8%), anthropogenic sources (18.5%), and marine sources (14.1%) during Asian Dust periods. Meanwhile, the aerosol compositions were largely influenced by soil sources, and followed by marine and anthropogenic sources during Non-Asian Dust periods.