Temporal Variation Of Aerosol Constituents In Tateyama Mountain Area, Japan

Data of water-soluble ionic species in aerosol particles, acidic gases and ammonia were obtained by analyzing four-stage filter packs collected at Tateyama station (Toyama prefecture, altitude: 1,180m) during from April 2004 to December 2011. Concentrations of non-sea-salt (nss) SO42- and NH4+ were high in spring to summer and were correlated well except for high nssCa(2+) samples in spring. Molar rations of NH4+/nssSO(4)(2-) were high (ca. 1.5) from spring to fall and decreased to 1.2 in winter. Annual mean concentrations of nssSO(4)(2+) at Tateyama station showed a peak (about 45 nmo1/m3) in 2005, and then, decreased to about half (about 23 nmol/m3) in 2011. On the other hand, annual mean concentrations of SO2 at Tateyama station were nearly constant (about 13 nmol/m(3)).