The following measurements were carried out to clarify acid deposition in Niigata Prefecture, an area facing to the Sea of Japan. 1) Acid deposition fluxes and sulfur isotopic ratios of atmospheric deposition were measured at 9 sites in the prefecture in 1999. 2) Atmospheric deposition was collected daily at one site in 1997, to measure the sulfur isotopic variations of sulfate together with the air mass trajectory for each deposition. It became clear that: (a) The major component that acidifies atmospheric deposition is sulfuric acid (b) Sulfate deposition increases in winter in the whole study area, (c) The sulfur isotopic ratios indicate that sulfur dioxide emitted from China affects the whole study area in winter, (d) Winter deposition of sulfate estimated to derive from coal combustion in China account for half of nss-sulfate deposition in average at 9 sites.
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- Seasonal and Spatial Variations in the Chemical and Sulfur Isotopic Composition of Acid Deposition in Niigata Prefecture, Japan
- Springer Netherlands