| Budget Amount *help |
¥19,110,000 (Direct Cost: ¥14,700,000、Indirect Cost: ¥4,410,000)
Fiscal Year 2014: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2013: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2012: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2011: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
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| Outline of Final Research Achievements |
The aim of this research is to obtain knowledge about the cause of temporal and spatial variation of atmospheric methane, which is one of the most important greenhouse gases after carbon dioxide. Systematic observations for the atmospheric CH4 concentration and its carbon and hydrogen isotope ratios had been carried out at four sites in the northern high latitudes. Since the isotope ratios of CH4 have information about CH4 sources, high-precision and systematic observation of both the CH4 concentration and the isotope ratios provide us an insight about the cause of the CH4 concentration variation. It was found from the observation that the CH4 released from wetland and fossil fuel contributed on the seasonal variation of the CH4 concentration. In addition, it is suggested that CH4 emission increase from wetland could be a dominant factor for the CH4 concentration increase observed after 2006.
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