| Budget Amount *help |
¥17,420,000 (Direct Cost: ¥13,400,000、Indirect Cost: ¥4,020,000)
Fiscal Year 2018: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2017: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2016: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2015: ¥7,540,000 (Direct Cost: ¥5,800,000、Indirect Cost: ¥1,740,000)
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| Outline of Final Research Achievements |
Systematic and precise measurements of the concentration and carbon and hydrogen isotope ratios of atmospheric methane were conducted by analyzing air samples regularly collected at northern high latitude sites, Antarctic station and in the western Pacific region, and their short-term, seasonal and long-term variations were identified. Simultaneous analysis with the concentration and isotope ratios suggested that the methane from microbial source could be responsible for the observed regrowth of the methane concentration after 2006 and after 2014. Simulations of the isotope ratios of the atmospheric methane with a three-dimensional atmospheric chemistry-transport model and prescribed methane inventory data gave isotopically lighter results than the observed values in this study. This indicates that the contribution ratio of each source category in the prescribed inventory is different from the real methane sources.
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