Sulfur Isotope Ratios of Coals used in East Asia.

  • MOTOYAMA Remi
    Department of Earth and Environmental Sciences, Faculty of Science, Yamagata University
  • YANAGISAWA Fumitaka
    Department of Earth and Environmental Sciences, Faculty of Science, Yamagata University
  • AKATA Naofumi
    Department of Earth and Environmental Sciences, Faculty of Science, Yamagata University
  • SUZUKI Yuuichirou
    Geological Survey of Japan
  • KANAI Yutaka
    Geological Survey of Japan
  • KOJIMA Takeshi
    Life and Environmental Technology Research Laboratory, Central Research Institute, Mitsubishi Materials Corporation
  • KAWABATA Akiko
    Life and Environmental Technology Research Laboratory, Central Research Institute, Mitsubishi Materials Corporation
  • UEDA Akira
    Life and Environmental Technology Research Laboratory, Central Research Institute, Mitsubishi Materials Corporation

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Other Title
  • 東アジアで使用されている石炭に含まれる硫黄の同位体比
  • ヒガシアジア デ シヨウ サレテ イル セキタン ニ フクマレル イオウ ノ ドウイタイヒ

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Abstract

Acidification of rain and snow is one of the most serious environmental problems in the world today. Sulfur isotope ratios considered to be related to this acidification, have been used as tracers. It has been reported that the sulfur isotope ratio of non-sea salt sulfate in winter is higher than that during other seasons, and that in the winter wet deposits contain sulfur released by the combustion of coal in East Asia. Sulfur isotope ratios of non-sea salt sulfate in wet depositions were measured at Sakata, northern Japan. The deposition rate of non-sea salt sulfate increases in winter. The sulfur isotope ratios of non-sea salt sulfate ranged from- 1 to+14‰and showed seasonal variation, with an increase in winter. This seasonal variation suggests that non-sea salt sulfate in wet deposition is derived from a source, having a higher sulfur isotope ratio in winter than in other seasons.In order to clarify the sources of non-sea salt sulfate in wet deposits, sulfur isotope ratios were measured for coals used in East Asia (China and Russia).The average sulfur isotope ratio of coals used in 30-20°N is-3.8±6.3‰, that of coals used in 60-30°N is+7.4±8.8‰, and that of northeastern Chinese coals (42-39°N)is+9.6±10.8‰.The sulfur isotope ratios of non-sea salt sulfate collected in Japan in the winter were in agreement with the sulfur isotope values for coals in northeastern China. The northwest Siberia monsoon dominates Japan in the winter. The air mass at the 850hPa level appears to have passed over Northeast Asia. Sulfur oxides produced by coal combustion in Northeast Asia have their highest contribution in winter.

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