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Title: | Photodissociation of particulate nitrate as a source of daytime tropospheric Cl2 | Authors: | Peng, X Wang, T Wang, W Ravishankara, AR George, C Xia, M Cai, M Li, Q Salvador, CM Lau, C Lyu, X Poon, CN Mellouki, A Mu, Y Hallquist, M Saiz-Lopez, A Guo, H Herrmann, H Yu, C Dai, J Wang, Y Wang, X Yu, A Leung, K Lee, S Chen, J |
Issue Date: | 2022 | Source: | Nature communications, 2022, v. 13, 939 | Abstract: | Chlorine atoms (Cl) are highly reactive and can strongly influence the abundances of climate and air quality-relevant trace gases. Despite extensive research on molecular chlorine (Cl2), a Cl precursor, in the polar atmosphere, its sources in other regions are still poorly understood. Here we report the daytime Cl2 concentrations of up to 1 ppbv observed in a coastal area of Hong Kong, revealing a large daytime source of Cl2 (2.7 pptv s−1 at noon). Field and laboratory experiments indicate that photodissociation of particulate nitrate by sunlight under acidic conditions (pH < 3.0) can activate chloride and account for the observed daytime Cl2 production. The high Cl2 concentrations significantly increased atmospheric oxidation. Given the ubiquitous existence of chloride, nitrate, and acidic aerosols, we propose that nitrate photolysis is a significant daytime chlorine source globally. This so far unaccounted for source of chlorine can have substantial impacts on atmospheric chemistry. | Publisher: | Nature Publishing Group | Journal: | Nature communications | EISSN: | 2041-1723 | DOI: | 10.1038/s41467-022-28383-9 | Rights: | This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. © The Author(s) 2022 The following publication Peng, X., Wang, T., Wang, W., Ravishankara, A. R., George, C., Xia, M., ... & Chen, J. (2022). Photodissociation of particulate nitrate as a source of daytime tropospheric Cl2. Nature communications, 13, 939 is available at https://doi.org/10.1038/s41467-022-28383-9 |
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