Wet Deposition of Black Carbon: Insights From a Comparative Study of Char/Soot in PM<sub>10</sub> and Rainwater
Abstract Wet scavenging of black carbon (BC) is essential for evaluating their atmospheric lifetime and radiative forcing. However, it is crucial to differentiate atmospheric BC into char and soot subgroups, given their significant disparities in physicochemical properties and potential impacts. We first conducted a comparative study of char/soot in PM 10 and rainwater, collected over a year in urban Guangzhou, China. The mean char/soot ratio in PM 10 (∼2.5) is obviously higher than that in rainwater (∼0.8), corresponding to higher wet scavenging efficiency of soot. Through sequence rainwater sampling during individual rainfall events, we further distinguished the contributions of in‐cloud and below‐cloud scavenging, with in‐cloud scavenging predominantly contributed to the distinct difference between char and soot. Such a distinct wet scavenging behavior of char and soot would have substantial implications for the atmospheric behavior of BC, which should be considered in future models for accurate evaluation of its lifetime and climate impact.
Authors
- Jinting Huang (ORCID: https://orcid.org/0000-0003-3923-0041)
- Xiaocong Peng
- Ping’an Peng (ORCID: https://orcid.org/0000-0002-8031-8451)
- Xinhui Bi (ORCID: https://orcid.org/0000-0002-3929-5470)
- Ziyong Guo
- Juying Lin
- Guohua Zhang (ORCID: https://orcid.org/0000-0002-6153-0748)
- Xinming Wang (ORCID: https://orcid.org/0000-0002-1982-0928)
- Yuzhen Fu
- Wei Sun (ORCID: https://orcid.org/0000-0002-9265-6546)
Institutions
- Chinese Academy of Sciences (CN)
- Guangzhou Institute of Geochemistry (CN)
- Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality (CN)
- Hainan Provincial Academy of Agricultural Sciences (CN)
- University of Chinese Academy of Sciences (CN)
- Taiyuan University of Technology (CN)
Publication Details
- Journal
- Journal of Geophysical Research Atmospheres
- Published
- 2025-04-23
- DOI
- https://doi.org/10.1029/2024jd043095
- Citations
- 2
- Primary Topic
- Atmospheric chemistry and aerosols
- Type
- article
- Field-Weighted Citation Impact
- 2.60
Funders
- National Natural Science Foundation of China
- Youth Innovation Promotion Association of the Chinese Academy of Sciences
- Guangdong Provincial Applied Science and Technology Research and Development Program
- Basic and Applied Basic Research Foundation of Guangdong Province