Development of a method to measure solid aerosols that act as ice nucleating particles

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K20437
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 63010:Environmental dynamic analysis-related
• Research Institution: Nagoya University
• Principal Investigator: Ohata Sho 名古屋大学, 高等研究院(宇宙), 助教 (70796250)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: エアロゾル / 鉱物ダスト / ブラックカーボン

Outline of Final Research Achievements

The freezing process of cloud droplets has a significant impact on precipitation formation and cloud reflectivity. In this process, solid aerosols inside water droplets play an important role by acting as nuclei for initiating ice formation. To measure the atmospheric number concentrations of solid aerosols, a new analytical method was examined, where aerosols were collected on a filter and water-insoluble solid particles were dispersed in water and measured optically. The validity of this method for measuring the number concentration of solid aerosols was demonstrated through laboratory experiments and comparative observations in the urban atmosphere with existing aerosol instruments.

Free Research Field

エアロゾル

Academic Significance and Societal Importance of the Research Achievements

鉱物ダストや生物由来粒子などの固体エアロゾルは雲の中で氷晶形成の核（氷晶核）として効率良く働くと考えられているもの、確立された測定手法がないために、その時空間的な変動や氷晶核への寄与の実態の把握が不十分である。本研究では、近年開発された水中微粒子の検出技術をフィルタに採取したエアロゾルの分析に応用し、その測定手法の評価を行った。本手法の評価は今後の固体エアロゾルと氷晶核の観測研究の１つの基礎となるものであり、これらの動態の理解に貢献すると考えられる。