Oxidized nitrogen-containing organic compounds formation enhanced the light absorption of PM2.5 brown carbon
- Language of the publication
- English
- Date
- 2025-02-06
- Type
- Accepted manuscript
- Author(s)
- Wang, Diwei
- Shen, Zhenxing
- Bai, Gezi
- Zhang, Leiming
- Huang, Shasha
- Zheng, Honghao
- Li, Cailan
- Sun, Jian
- Xu, Hongmei
- Cao, Junji
- Publisher
- American Geophysical Union
Abstract
Brown carbon (BrC) is known to have a great impact on atmospheric radiative forcing, but its absorption characteristics at the molecular level is not well understood. This study investigated the seasonal variations of light absorption characteristics and molecular composition of BrC in Xi’an, China. Results showed that BrC exhibited higher light absorption capacity in cold (autumn and winter) than warm seasons (spring and summer). Nitrogen-containing organic compounds were identified as important BrC chromophores. Oxidized-N compounds originated from biomass burning emissions and NOx/NO3− mediated oxidation reactions were predominant in cold seasons, while reduced-N compounds mainly formed from NH3/NH4+ mediated reactions were abundant in warm seasons. These results contribute to a better understanding of formation mechanisms and light absorption characteristics of nitrogen-containing BrC chromophores in PM2.5.
Description
An edited version of this paper was published by AGU. Published 2025 American Geophysical Union.
Subject
- Air pollution,
- Urban environment,
- Air quality,
- Atmospheric emissions
Rights
Pagination
39 pages
Peer review
Yes
Open access level
Green
Identifiers
- ISSN
-
2169-8996
- 2169-897X
Article
- Journal title
- Journal of Geophysical Research: Atmospheres
- Journal volume
- 130
- Journal issue
- 3
- Accepted date
- 2025-01-27
- Submitted date
- 2024-11-13
Relation
- Is replaced by:
- https://doi.org/10.1029/2024JD042960