2021 Fiscal Year Final Research Report
Emission of amines from forests and their contribution to the new particle formation
| Project/Area Number |
19K03971
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 17020:Atmospheric and hydrospheric sciences-related
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| Research Institution | University of Yamanashi |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | アミン / エアロゾル / 森林 / 新粒子生成 |
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| Outline of Final Research Achievements |
In this study, simultaneous observations of amines in the aerosols and gas phase were conducted at a forested site on the northern foot of Mt. Fuji. The concentrations of several amines, such as methylamine and dimethylamine, in fine particles increased during the warm season, and showed positive correlations with their concentrations in the gas phase. The concentrations of these gaseous amines showed positive correlations with NH3 gas concentration and air temperature, suggesting that the volatilization of amines from the forest soils was accelerated as air temperature increased, and that these gaseous amines reacted with acidic components to form fine particles. These results suggest the emission of amines from the forest soils and their contribution to the formation and/or growth of fine particles.
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| Free Research Field |
大気化学
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| Academic Significance and Societal Importance of the Research Achievements |
エアロゾル個数濃度の増減は、太陽光散乱の程度を左右するなど、地球気候に大きな影響を及ぼす。気体分子からエアロゾルが生成される新粒子生成反応は、エアロゾル個数濃度を増やす最も重要な経路である。近年この反応を促進する物質としてアミンが注目されているが、大気中アミンに関する観測例は少なく、その濃度レベルや発生源の理解は乏しい。本研究において、森林土壌からアミンが発生しエアロゾルの生成や成長を促していることが示唆された。このことは、地球陸地面積のおよそ3割を占める森林から発生するアミンが、地球大気のエアロゾル個数濃度のバックグランド値を決定し、地球の気候とその変動に影響を及ぼしている可能性を示唆する。
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