| Budget Amount *help |
¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000)
Fiscal Year 2023: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2022: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2021: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2020: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Outline of Final Research Achievements |
Lake Baikal, Russia, is the only freshwater lake in which methane hydrates (MHs) have accumulated in subsurface sediments. International collaborative research projects were conducted by scientists from Japan, Russia and Belgium to study subsurface MH formation/dissociation.
Subsurface MHs were retrieved at a mound-like bottom area off eastern coast of the central basin. The pressure-temperature condition at the MH-bearing area was, however, slightly out of the MH-stability conditions. This finding suggests that the MHs at the area have been in the process of dissociating since decrease in the water level and/or increase in water/sediment temperature. The fact that methane gas emissions from the lake floor were observed at the area supports aforementioned interpretation.
All results obtained during this study suggest potential relations between MH destabilization/methane gas emission and environmental fluctuations at the studied area.
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