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 (367Kb)
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27,258,000 Yen (FY1996 8,011,000 Yen)
As Japan is located at the eastern extreme of East Asia, there are concerns about the transboundary transport of acid rain pollutants carried from continental China by the westerlies from autumn through winter and into spring. The exceptionally fast recent development of China's industrial regions suggests that the impacts of acid rain will continue to grow. We selected 10 major industrial areas mainly along China's eastern coastal region, and simulated the state of transboundary pollution through wet acidic fallout caused by sulfur oxides from each of these areas. The receptor sites in Japan were 47 national or local government-operated monitoring stations from Hokkaido to Kyushu that are capable of measuring sulfuric acid ions.
The simulation time frame was the two months of October and November 1993, and the simulation used the parameters of each month.
SO2 was calculated by assuming a yearly 5% increase from the emissions reported for the 10 areas in 1987 and the results were used as 1993 SO2 emissions. Simulation results showed that emissions from the coastal industrial zones in eastern and southeastern China have a large impact on Japan's Kyushu region, while those from China's northeast affect Japan's Kanto and Tohoku regions. Actual results of measurements in some locations, however, fiffered from those anticipated, indicating that more study of the accurary of measurements of SO2 emissions and sulfuric acid ions, meteorological date, reaction speeds in the atmosphere, the applicability of the model used, and other items is needed.
China, westerlies, acidic fallout, transport model, simulation