Study on particle formation mechanisms of biogenic polyamines in a subtropical zone of Japan

2023 Fiscal Year Final Research Report

• Project/Area Number: 22K21330
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 1101:Environmental analyses and evaluation, environmental conservation measure and related fields
• Research Institution: University of the Ryukyus
• Principal Investigator: Saeki Kentaro 琉球大学, 理学部, 助教 (70962801)
• Project Period (FY): 2022-08-31 – 2024-03-31
• Keywords: ポリアミン / 新粒子 / 亜熱帯林 / 植物由来揮発性有機化合物 / 二次有機エアロゾル / 大気粒子

Outline of Final Research Achievements

Amines contribute significantly to new particle formation among biogenic volatile organic compounds. However, polyamines have not been investigated in detail. In the present study, a part of the role of polyamines in particle formation was elucidated by determining the concentration of polyamines in the subtropical forest atmosphere. Three typical diamines were detected in the subtropical forest, and their concentrations were high on days with high temperature and solar radiation during the Fagaceae blossom season. On the other hand, aminoamide, which derived from diamine and more contribute to new particle formation than diamines, was not detected. Additionally, new particle formation event in which microparticles were generated and grew as the concentration of diamine increased from daytime to evening was observed.

Free Research Field

分析化学

Academic Significance and Societal Importance of the Research Achievements

大気中の植物由来揮発性有機化合物の存在は，非都市域におけるエアロゾル形成への寄与の大きさから重要視されており，塩基性物質のアミン類の役割が注目されている。その中でもポリアミン類が起源となる粒子形成は，近年日本でも頻度が増加している集中豪雨発生の一端を担っている可能性がある。しかし，豪雨を発生させる雲の核となる粒子がどのように生成し，粒子内でポリアミン類がどのようにかかわっているのかは未知の部分が多い。ポリアミン類が関わるエアロゾル粒子形成機構や粒子内での化学反応が明らかになることで，集中豪雨発生メカニズムの解明や気象シミュレーションモデルへの応用が期待される。