Source-receptor Analysis for Sulfur Compounds in East Asia by a Regional Transport Modeling System Coupled with a Meteorological Model:Transport Modeling System Coupled with a Meteorological Model
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We examine the source-receptor relationships for sulfur in East Asia in July and December, 1995, using by a regional chemical transport model (HYPACT) coupled with a Regional Atmospheric Modeling System (RAMS) in order to clarify the fraction contribution of sulfur deposition sources in Japan and their seasonal and spatial variations. The simulation model used in this study is different from the model used in the previous source-receptor analysis in that it uses the high-resolving meteorological/hydrological dataset calculated by the regional meteorological model in the calculation of the vertical diffusion and dry/wet depositions processes in the chemical transport model. We added the simple chemical transformation and wet and dry depositions modules to simulate SO<SUB>4</SUB><SUP>2-</SUP> and SO<SUB>2</SUB>. The HYPACT can reproduce the day-to-day variations of SO<SUB>4</SUB><SUP>2-</SUP> concentration and the monthly amount of SO<SUB>4</SUB><SUP>2-</SUP> wet deposition. Monthly sourcereceptor relationships are estimated for forty-nine regions and volcanoes in East Asia. The model shows that, of the monthly sulfur deposition in Japan in July, 36% comes from volcanoes, 28% from Japan, 18% from China and 12% from North and South Korea. On the other hand, in December, of Japan's deposition, 58% comes from China, 17% from North and South Korea, 13% from Japan, and 8% from volcanoes. This means that in July the contribution of domestic sources including volcanoes is very large and reaches at 64%, while in December, the total contribution of domestic sources including volcanoes decreases to 21% and the contribution of transboundary pollution increases to almost 75%. Thus, the fraction contribution of sulfur deposition sources in Japan exhibits strong seasonal variation and this is caused by the seasonal fluctuations in synoptic wind system.<BR>The sources of Japan's seasonal deposition vary significantly as a function of location within Japan. The deposition along the Pacific coast is 3 times higher for July than for December. In contrast, along the Japan Sea coast, the deposition is only 10% higher for December than for July. Consequently, in the overall Japan, the deposition is almost 20% higher for July, when the domestic sources including volcanoes predominate, than for December, when transboundary pollution predominates. Thus, when viewing the seasonal variations in Japan's deposition, the seasonal variation of influence from domestic sources including volcanoes is more important than that from transboundary pollution.
- 社団法人 大気環境学会の論文
社団法人 大気環境学会 | 論文
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