- 1Department of Environment and Energy, Jeonbuk National University, Republic of Korea (mijung.song@jbnu.ac.kr)
- 2Department of Earth and Environmental Sciences, Jeonbuk National University, Republic of Korea
- 3Institute of Atmospheric Physics, Chinese Academy of Sciences, University of Chinese Academy of Sciences, China
- 4College of Environmental Sciences and Engineering, Peking University, China
- 5Department of Environmental Science and Engineering, Ewha Womans University, Republic of Korea
- 6Institute of Nature and Environmental Technology, Kanazawa University, Japan
Aerosol particle morphology plays a pivotal role in atmospheric processes, particularly heterogeneous chemistry. This study investigates phase transitions and corresponding morphologies of PM2.5 particles collected from three Northeast Asian cities: Seoul, Beijing, and Noto. The samples, representing both polluted and clean environments, were predominantly organic-rich. Observations reveal that PM2.5 particles underwent distinct phase transitions with varying relative humidity (RH), often forming complex three-phase systems. Under ambient conditions, particles predominantly existed in two-liquid or three-phase states, with fully homogeneous or non-liquid states being rare. The organic-rich outer phase serves as a diffusion barrier, limiting the reactive uptake of N₂O₅, especially at lower RH when organic materials become more viscous. These findings will be presented.
How to cite: Song, M., Seong, C., Li, Y., Wu, Z., Lee, J. Y., and Matsuki, A.: Core-shell morphology of PM2.5 from three Northeast Asian cities: Its role in reactive uptake , EGU General Assembly 2025, Vienna, Austria, 27 Apr–2 May 2025, EGU25-1895, https://doi.org/10.5194/egusphere-egu25-1895, 2025.
