| Budget Amount *help |
¥16,120,000 (Direct Cost: ¥12,400,000、Indirect Cost: ¥3,720,000)
Fiscal Year 2021: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2020: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2019: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2018: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
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| Outline of Final Research Achievements |
Global scale observations of CO2 concentration, the carbon isotopic ratio (delta13C) of CO2, and oxygen concentration (delta(O2/N2)) in the atmosphere have been made since 2001. Based on the observed secular trends of CO2 concentration and delta(O2/N2) as well as anthropogenic CO2 emission data, the average uptake rates of the anthropogenic CO2 during 2001-2020 among the atmosphere, the terrestrial biosphere and the ocean were estimated to be 44±0.3％, 33±6％ and 23±6％, respectively. By using the observed CO2 and delta13C, the corresponding CO2 uptakes were in good agreement with the former method within the estimated error ranges. The terrestrial biospheric CO2 uptake showed large interannual variability in association with El Nino events.
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