2022 Fiscal Year Final Research Report
Reconsideration of a role of RO2 uptake by aerosols in the atmospheric HOx cycle based on the kinetics study
| Project/Area Number |
19H04255
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 63010:Environmental dynamic analysis-related
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2023-03-31
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| Keywords | 光化学オキシダント / エアロゾル / ラジカル取り込み速度 / HOｘサイクル / オゾン生成速度 / PM / 不均一反応 / RO2ラジカル |
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| Outline of Final Research Achievements |
A method for determining the uptake coefficients of RO2 radicals onto aerosols by combining laser-pump radical generation and laser-induced fluorescence radical detection was established. The uptake coefficients of various RO2 radicals into inorganic and organic aerosols were examined in laboratory experiments. We also developed a method for direct determination of the uptake coefficients of RO2 onto atmospheric aerosols, and applied for determination of the uptake coefficients of isoprene-derived RO2 by atmospheric observation. Assuming that the obtained uptake coefficient of isoprene-derived RO2 onto atmospheric aerosol is representative, the ozone formation suppression effect up to 8.5% was estimated after sunrise under the observed conditions.
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| Free Research Field |
大気化学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究によりRO2の取り込み係数の決定手法が確立され，また一部RO2について大気エアロゾルの取り込み係数を報告したため，今後はこれまで実験値が無く考慮されてこなかったRO2ラジカルのエアロゾルへの取り込み過程を大気モデルシミュレーションに実装する根拠が示された．本研究結果を基に，今後大気プロセスの中でRO2のエアロゾル取り込みがオキシダント・二次エアロゾル動態とどのように関わるか定量的に明らかにされると期待される．特に，我が国において前駆体削減に関わらず高止まりを続けているオゾン濃度について，ひとつの説明となることが期待される．
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