Seasonal Composition Characteristics of TSP and PM2.5 Aerosols at Gosan Site of Jeju Island, Korea during 2008-2011

Abstract

The collection of TSP and PM2.5 aerosols has been made at the Gosan Site of Jeju Island during 2008-2011, and their ionic and elemental species were analyzed, in order to examine the seasonal variation and characteristics of aerosol compositions. The anthropogenic components (NH4+, nss-SO42-, NO3-, S, Zn, Pb) and the soil components (nss-Ca2+, Al, Fe, Ca) showed high concentrations in spring as the prevailing westerly wind, but the concentrations of the sea-salt components (Na+, Cl-) were high in winter. In TSP, the neutralization by NH3 increased in summer, but the neutralization by CaCO3 increased in spring and fall seasons. The organic acids (HCOO-, CH3COO-) contributed to the acidification of the aerosols by only 5.0%, so the acidification could be mostly contributed by the inorganic acids (SO42-, NO3-). From the examination of the source origins by factor analysis, the compositions of TSP were influenced by the order of soil>anthropogenic>marine, on the other hand, those of PM2.5 were by the order of anthropogenic> marine>soil. The backward trajectory analyses showed that the concentrations of NH4+, nss-SO42-, NO3- and nss-Ca2+ increased highly when the air masses had moved from China continent into Gosan area of Jeju Island.

Keywords

• tsp
• pm2.5
• gosan site
• neutralization
• backward trajectory