Project/Area Number |
18K03746
|
Research Category |
Grant-in-Aid for Scientific Research (C)
|
Allocation Type | Multi-year Fund |
Section | 一般 |
Review Section |
Basic Section 17020:Atmospheric and hydrospheric sciences-related
|
Research Institution | Aichi University of Technology (2023) Kyushu University (2018) |
Principal Investigator |
|
Project Period (FY) |
2018-04-01 – 2024-03-31
|
Project Status |
Completed (Fiscal Year 2023)
|
Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
|
Keywords | ヨウ素 / ヨウ化物イオン / オゾン / 二酸化窒素 / キャビティリングダウン分光 / 不均一反応 / 氷 / 極域環境 / 極域 / 吸収分光 / レーザー / キャビティーリングダウン分光 |
Outline of Final Research Achievements |
High concentrations of iodine (I2) and iodine monoxide radical (IO) have been observed in the Weddell Sea, which cannot be explained solely by biological releases. This observation suggests that there are other sources of production, such as inorganic chemical reactions. In this study, iodine compounds released from the photooxidation of iodide ions (I-) in ice and from the ice surface by the reaction of ozone (O3) or nitrogen dioxide (NO2) with the surface of frozen aqueous solutions containing iodide ions (I-) was studied in order to identify the source of these iodine compounds. The results suggested that reactions in/on ice, such as sea ice and snow ice, can be a source of iodine release in polar regions. The mechanism of iodine activation was elucidated.
|
Academic Significance and Societal Importance of the Research Achievements |
ヨウ素原子は微量ながら触媒サイクルにより対流圏オゾン濃度を減少させたり、エアロゾルを生成したりして気候に影響を与えている。極域で生物放出のみでは説明できない高濃度のヨウ素が観測されていたが、本研究により新たな放出源を明らかにすることができた。 氷表面上での不均一反応によって気相中に放出されたガス種の高感度計測装置を開発した。雪氷や海氷での反応は、本研究の反応以外にも極域大気に影響を及ぼしているため今後の不均一反応機構の研究に役立つ。
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