Abstract
An estimation of the annual deposition of sulfur oxides was made using disclosed data of the Acid Deposition Monitoring Network in East Asia in 2001. In order to estimate dry deposition, deposition velocities of sulfur dioxide and non-sea-salt sulfate were calculated at each site using world meteorological data and land use data from the United States Geological Survey. Dry and wet depositions were compared with anthropogenic sulfur emissions at each site to evaluate its budget. Deposition velocities that were estimated in each land use type were within the parameters of previous studies. The deposition of sulfur oxides was higher at Chinese sites than at the other sites. At an urban site in Mongolia, two inland sites in China and two urban sites in Southeast Asia, the sulfur emissions were clearly higher than the depositions; on the other hand, at a coastal site in China, the sulfur emissions were clearly lower than the depositions. The former indicates outflow from the areas; the later indicates inflow to the area. When comparing remote areas in Mongolia, Japan and Malaysia, an inflow of the sulfur oxides from other areas was found in the Japanese area.
