Long-term variation of the source of sulfate deposition in a leeward area of Asian continent in view of sulfur isotopic composition. (September 2016)

• Record Type: Journal Article
• Authors: Ohizumi, Tsuyoshi; Take, Naoko; Inomata, Yayoi; Yagoh, Hiroaki; Endo, Tomomi; Takahashi, Masaaki; Yanahara, Kazuki; Kusakabe, Minoru
• Is Part Of: Atmospheric environment. Volume 140(2016)
• Page Start: 42
• Page End: 51
• Publication Date: 2016-09
• Subjects: Sulfur isotopic ratio -- Sulfate -- Acid deposition -- Coal combustion -- Northeastern Asia; Air -- Pollution -- Periodicals; Air -- Pollution -- Meteorological aspects -- Periodicals; 551.51
• DOI: 10.1016/j.atmosenv.2016.05.057
• Languages: English
• ISSNs: 1352-2310

Abstract

Abstract: A large emission of air pollutants from the Asian continent has caused transboundary air pollution, especially in northeastern Asia. This paper evaluates sulfate deposition at a leeward area of Asian continent, i.e., the Nagaoka observation station located along the Sea of Japan. We have monitored atmospheric sulfate deposition and its sulfur isotopic ratio for 28 years at the station. The sulfur isotopic ratios of non-sea-salt sulfate (δ 34 Snss) ranged from 0.0 to +6.2‰. The isotopic ratios of local emission and Chinese coal sulfur showed negative and positive values, respectively. Several statistically significant trends were detected on the deposition of non-sea-salt sulfate (nss-SO4 2− ) during the study period. The decrease of nss-SO4 2− deposition since the middle of 1980s was considered to have been caused by local anthropogenic SO2 emission that showed relatively low δ 34 Snss values during the period. The increase of nss-SO4 2− deposition from the end of 1990s to the second half of 2000s was interpreted to have been caused by the change in SO2 emission in China because the δ 34 Snss values increased during the period with the winter values getting closer to the averaged value of Chinese coal sulfur. The decreasing trend of nss-SO4 2− deposition from the middle of 2000s was likely affected by reduction of Chinese SO2 emission judging from the decrease in δ 34 Snss values in the period. Mass balance calculations suggested that sulfur released by coal combustion in China during 1990s contributed by about 40% of annual total sulfur deposition in Nagaoka, and its contribution increased up to 60% in the middle of 2000s. The contribution turned to decrease after that peak, which was in harmony with the temporal change of emission from China. Highlights: Sulfate deposition and its sulfur isotopic ratio were monitored during 28 years. Several statistically significant trends of sulfate deposition were detected. Causes of variation of sulfate deposition were clarified by sulfur isotopic ratio. Contributions of sulfur sources were estimated utilizing sulfur isotopic ratio. Contribution of Chinese coal sulfur was estimated in the range of 40 → 60%.