Articles | Volume 25, issue 6
https://doi.org/10.5194/acp-25-3647-2025
https://doi.org/10.5194/acp-25-3647-2025
Measurement report
 | 
27 Mar 2025
Measurement report |  | 27 Mar 2025

Measurement report: Optical and structural properties of atmospheric water-soluble organic carbon in China – insights from multi-site spectroscopic measurements

Haibiao Chen, Caiqing Yan, Liubin Huang, Lin Du, Yang Yue, Xinfeng Wang, Qingcai Chen, Mingjie Xie, Junwen Liu, Fengwen Wang, Shuhong Fang, Qiaoyun Yang, Hongya Niu, Mei Zheng, Yan Wu, and Likun Xue

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Cited articles

Adam, M. G., Tran, P. T. M., and Balasubramanian, R.: Air quality changes in cities during the COVID-19 lockdown: A critical review, Atmos. Res., 264, 105823, https://doi.org/10.1016/j.atmosres.2021.105823, 2021. 
Anastasio, C., Faust, B. C., and Rao, C. J.: Aromatic carbonyl compounds as aqueous-phase photochemical sources of hydrogen peroxide in acidic sulfate aerosols, fogs, and clouds. 1. Non-phenolic methoxybenzaldehydes and methoxyacetophenones with reductants (phenols), Environ. Sci. Technol., 31, 218–232, https://doi.org/10.1021/es960359g, 1997. 
Andreae, M. O. and Gelencsér, A.: Black carbon or brown carbon? The nature of light-absorbing carbonaceous aerosols, Atmos. Chem. Phys., 6, 3131–3148, https://doi.org/10.5194/acp-6-3131-2006, 2006. 
Bosch, C., Andersson, A., Kirillova, E. N., Budhavant, K., Tiwari, S., Praveen, P. S., Russell, L. M., Beres, N. D., Ramanathan, V., and Gustafsson, O.: Source-diagnostic dual-isotope composition and optical properties of water-soluble organic carbon and elemental carbon in the South Asian outflow intercepted over the Indian Ocean, J. Geophys. Res.-Atmos., 119, 11743–11759, https://doi.org/10.1002/2014jd022127, 2014. 
Cao, J., Shang, J., Kuang, Y., Jiang, X., Shi, X., and Qiu, X.: Molecular composition of Beijing PM2.5 Brown carbon associated with fluorescence revealed by gas chromatography time-of-flight mass spectrometry and parallel factor analysis, Atmos. Environ., 333, 120670, https://doi.org/10.1016/j.atmosenv.2024.120670, 2024a. 
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A comprehensive understanding of the optical properties of brown carbon (BrC) is essential to accurately assess its climatic effects. Based on multi-site spectroscopic measurements, this study demonstrated the significant spatial heterogeneity in the optical and structural properties of water-soluble organic carbon (WSOC) in different regions of China and revealed factors affecting WSOC light absorption and the relationship between fluorophores and light absorption of WSOC.
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