2023 Fiscal Year Final Research Report
Development of a high-precision measurement system for the triple oxygen isotopic compositions of atmospheric carbon dioxide
Project/Area Number |
22K19846
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Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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Allocation Type | Multi-year Fund |
Review Section |
Medium-sized Section 63:Environmental analyses and evaluation and related fields
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Research Institution | Nagoya University |
Principal Investigator |
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Project Period (FY) |
2022-06-30 – 2024-03-31
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Keywords | 二酸化炭素 / 三酸素同位体組成 / 対流圏大気 / 都市域 / 森林域 |
Outline of Final Research Achievements |
The triple oxygen isotopic compositions of tropospheric carbon dioxide can be a useful tracer to quantify carbon cycle in terrestrial environments. Traditionally, carbon dioxide must be converted to oxygen gas to determine triple oxygen isotopic compositions precisely. However, toxic and dangerous reagents such as bromine pentafluoride must be needed for the reactions to convert carbon dioxide to oxygen gas. In this study, we developed an alternative new method for the high precision measurements on the triple oxygen isotopic compositions of carbon dioxide using Cavity Ring-Down Spectroscopy (CRDS) for water and successfully measured them in urban areas and forests.
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Free Research Field |
同位体地球化学
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Academic Significance and Societal Importance of the Research Achievements |
国内では初となる対流圏二酸化炭素の高精度三酸素同位体組成の定量が実現した。本手法は安全で簡便な手法であり、三酸素同位体組成の応用範囲が広がる。これにより、世界各地で連続モニタリングされている対流圏二酸化炭素濃度に見られる季節変動や経年変化、イベント的な変動に関して、原因を把握し、必要に応じて迅速な対策を講じることが出来るようになり、地球システムや炭素循環の学術的理解を深化させることが出来るようになると考えられる。
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