Atmospheric aerosols were measured at the Observatory of Atmospheric Research, in Phimai, Thailand, during 2006-2007, which is one of the stations of SKYNET. Aerosols were much higher in dry seasons where biomass burning of agricultural residues was frequently made in tropical region. In fine particles, ammonium sulfate, and elementary and organic carbons were major components. The concentration ratio of elementary carbons to sulfate in dry seasons was much higher than that at Amami-Oshima in southwest Japan, where the anthropogenic aerosols were transported from the urban-industrial area of east coast of China. In coarse particles, calcium nitrate was a major component, in addition to soil particles, and nitrates were expected to be produced from biomass burning. These results clearly indicate that the aerosols generated from biomass burning affect on atmospheric environment, and radiation budget in the tropics.
Carbonaceous aerosols, Biomass burning, Soil particles, Single scattering albedo, Climate change