Development of a measurement system for atmospheric Ar and estimation of oceanic and terrestrial biospheric CO2 uptake

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K16119
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Environmental dynamic analysis
• Research Institution: National Institute of Polar Research
• Principal Investigator: Goto Daisuke 国立極地研究所, 研究教育系, 助教 (10626386)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 全球炭素収支 / 炭素循環 / 大気中アルゴン濃度 / 大気中酸素濃度 / 海洋貯熱量

Outline of Final Research Achievements

To improve the uncertainty in the estimation of global carbon uptake based on the atmospheric CO2 and O2 by using the atmospheric Ar that varies with only the change in oceanic heat content, we developed a measurement system for atmospheric Ar. The precision of the system was estimated to be 21 per meg (1 sigma). By analyzing the long-term variations of the atmospheric CO2 and O2 observed at Syowa Station, Antarctica, oceanic and terrestrial biospheric CO2 uptake were estimated to be 2.4 ± 0.8 and 1.6 ± 0.7 GtC/yr, respectively.

Free Research Field

大気科学