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2021 Fiscal Year Final Research Report

Stugy of reproducibility of the scale for atmospheric CO2 observation

Research Project

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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
Keywords二酸化炭素 / 標準ガス / 分別効果 / 二酸化炭素スケール
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.

Free Research Field

分析化学

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。

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Published: 2023-01-30  

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