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Stugy of reproducibility of the scale for atmospheric CO2 observation

Research Project

Project/Area Number 19K05554
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 34020:Analytical chemistry-related
Research InstitutionNational Institute of Advanced Industrial Science and Technology

Principal Investigator

Aoki Nobuyuki  国立研究開発法人産業技術総合研究所, 計量標準総合センター, 主任研究員 (60414356)

Co-Investigator(Kenkyū-buntansha) 村山 昌平  国立研究開発法人産業技術総合研究所, エネルギー・環境領域, 総括研究主幹 (30222433)
石戸谷 重之  国立研究開発法人産業技術総合研究所, エネルギー・環境領域, 研究グループ長 (70374907)
Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords二酸化炭素 / 標準ガス / 分別効果 / 二酸化炭素スケール / 大気観測 / CO2 / 秤量 / 標準 / 濃度スケール
Outline of Research at the Start

本研究では、標準ガス調製時に空気と二酸化炭素が分別しない二酸化炭素標準ガスの調製方法を確立して、各機関が所有する二酸化炭素の濃度スケールの差が指針値以下にすることを目指している。また、この分別効果は、すべてガス種で起こり、その濃度変動は低濃度の標準ガスであるほど大きくなると推測される。そのため、様々なガス種の分別効果を調べ、標準ガス調製時に生じる分別メカニズムの解明にも取り組む。

Outline of Final Research Achievements

We conducted a study to fully understand the carbon dioxide (CO2) adsorption and the fractionation of CO2 and air during the preparation. The amount of CO2 adsorbed on the internal surfaces of a 10 L aluminum cylinder when preparing a standard mixture with atmospheric CO2 level was estimated. It showed that the deviation of CO2 mole fraction was caused by the fractionation of CO2 and air in the transfer a source gas (a CO2/Air mixture with a higher CO2 molar fraction than that in the prepared gas mixture) during preparation process of standard gas mixtures. Additionally, we established a method to prepare standard mixtures by diluting the pure CO2 with the air only once, to avoid fractionation during the preparation. The evaluation of standard mixtures prepared by multistep dilution based on the standard mixtures prepared using the established method indicates that the deviation is larger than a compatibility goal of WMO.

Academic Significance and Societal Importance of the Research Achievements

地球温暖化を正確に予測するためには、その基盤となる温室効果ガスの観測データの同等性が担保されなければならない。しかしながら、これまで観測データの同等性を完全には担保することができず、その原因も不明であった。本研究では、既存の手法で担保されているデータの同等性の問題点が初めて定量的に明らかにし、その問題の解決手法も提示したことに学術的な意義がある。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (5 results)

All 2022 2021 2019

All Journal Article (2 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results,  Open Access: 2 results) Presentation (3 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Intercomparison of O2 / N2 ratio scales among AIST, NIES, TU, and SIO based on a round-robin exercise using gravimetric standard mixtures2021

    • Author(s)
      Nobuyuki Aoki, Shigeyuki Ishidoya, Yasunori Tohjima, Shinji Morimoto, Ralph F. Keeling, Adam Cox, Shuichiro Takebayashi, and Shohei Murayama
    • Journal Title

      Atmospheric Measurement Techniques

      Volume: 14 Issue: 9 Pages: 6181-6193

    • DOI

      10.5194/amt-14-6181-2021

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Influence of adsorption of CO2 on cylinder and fractionation of CO2 and air during preparation of a standard mixture2021

    • Author(s)
      Nobuyuki Aoki, Shigeyuki Ishidoya, Shohei Murayama, and Nobuhiro Matsumoto
    • Journal Title

      Atmospheric Measurement Techniques Discussion

      Volume: -

    • DOI

      10.5194/amt-2022-41

    • Related Report
      2021 Annual Research Report
    • Open Access
  • [Presentation] 質量比混合法で調製された標準ガスはどこまで信頼できるのか?2022

    • Author(s)
      青木伸行,石戸谷重之,村山昌平,松本信洋
    • Organizer
      第26回大気化学討論会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 分別効果に起因する大気観測用CO2標 準ガスの再現性評価2021

    • Author(s)
      青木 伸行、村山 昌平、石戸谷 重之
    • Organizer
      日本分析化学会第69 年会
    • Related Report
      2020 Research-status Report
  • [Presentation] Influences of thermal fractionation and adsorption on CO2 standard mixture gravimetrically prepared using multiple steps2019

    • Author(s)
      Nobuyuki Aoki, Shigeyuki Ishidoya, and Shohei Murayama
    • Organizer
      The 20th WMO/IAEA Meeting on Carbon Dioxide, Other Greenhouse Gases, and Related Measurement Techniques
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

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Published: 2019-04-18   Modified: 2023-01-30  

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