EGU23-253
https://doi.org/10.5194/egusphere-egu23-253
EGU General Assembly 2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Phase state of PM2.5 in Seoul and Beijing and its effect on particle size distribution

Daeun Kim1, Rani Jeong1, Yanting Qui2, Xiangxinyue Meng2, Zhijun Wu2, Andreas Zuend3, Yoonkyeong Ha4, Changhyuk Kim4, Haeri Kim1, Sanjit Gaikwad1, Kyoung-Soon Jang5, Jiyi Lee6, Joonyoung Ahn7, and Mijung Song1,8
Daeun Kim et al.
  • 1Jeonbuk National University, Department pf Environment and Energy, Jeollabuk-do Jeonju-si 54896, Korea, Republic of (dekim@jbnu.ac.kr)
  • 2State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China
  • 3Department of Atmospheric and Oceanic Sciences, McGill University, Montréal, Quebec H3A 0B9, Canada
  • 4School of Civil and Environmental Engineering, Pusan National University, Busan 46241, Republic of Korea.
  • 5Bio-Chemical Analysis Team, Korea Basic Science Institute, Cheongju 28119, Republic of Korea.
  • 6Department of Environmental Science & Engineering, Ewha Womans University, Seoul 03760, Republic of Korea.
  • 7Department of Atmospheric Environment Research, National Institute of Environmental Research, Seoul 03367, Republic of Korea.
  • 8Department of Earth and Environmental Sciences, Jeonbuk National University, Jeollabuk-do Jeonju-si 54896, Republic of Korea

A phase state of ambient aerosols is a key parameter to understand physicochemical properties of aerosols such as growth rate, size distribution, and mass concentration that affect climate and human health. However, only limited information of real aerosol phase states has been obtained. Herein, to explore phase states of fine particulate matter (PM2.5) in megacities, we collected daily PM2.5 filter samples during December 2020 – January 2021 in Seoul and Beijing. Optical microscopy and a poke-and-flow technique were used to observe the morphologies and phase states of the PM2.5. Results showed that the average phase states of the PM2.5 were significantly different in the two megacities. The PM2.5 existed as a liquid state to a semisolid in Seoul while it existed as a semisolid to a solid in Beijing. These differences were governed by the chemical composition of PM2.5 and aerosol liquid water content. Furthermore, the phase state of PM2.5 in two megacities was correlated with particle size distribution. Our findings can provide an understanding of the phase states of real-world aerosols and how the phase state is linked to chemical compositions, ALWC, and size distributions of PM2.5.

How to cite: Kim, D., Jeong, R., Qui, Y., Meng, X., Wu, Z., Zuend, A., Ha, Y., Kim, C., Kim, H., Gaikwad, S., Jang, K.-S., Lee, J., Ahn, J., and Song, M.: Phase state of PM2.5 in Seoul and Beijing and its effect on particle size distribution, EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-253, https://doi.org/10.5194/egusphere-egu23-253, 2023.