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Photodissociation of particulate nitrate as a source of daytime tropospheric Cl-2
Peng, Xiang; Wang, Tao; Wang, Weihao; Ravishankara, A. R.; George, Christian; Xia, Men; Cai, Min; Li, Qinyi; Salvador, Christian Mark; Lau, Chiho; Lyu, Xiaopu; Poon, Chun Nan; Mellouki, Abdelwahid; Mu, Yujing; Hallquist, Mattias; Saiz-Lopez, Alfonso; Guo, Hai; Herrmann, Hartmut; Yu, Chuan; Dai, Jianing; Wang, Yanan; Wang, Xinke; Yu, Alfred; Leung, Kenneth; Lee, Shuncheng; Chen, Jianmin
AbstractChlorine 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 (Cl-2), a Cl precursor, in the polar atmosphere, its sources in other regions are still poorly understood. Here we report the daytime Cl-2 concentrations of up to 1 ppbv observed in a coastal area of Hong Kong, revealing a large daytime source of Cl-2 (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 Cl-2 production. The high Cl-2 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. This study unravels an important daytime Cl-2 source in the extra-polar atmosphere and shows that photolysis of particle nitrate at high acidity produced unprecedented levels of Cl-2, boosting the oxidative power and air pollutants like O-3.
Department大气环境与污染控制实验室 ; 大气环境与污染控制实验室
Document Type期刊论文
Corresponding AuthorWang, Tao
Affiliation1.Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong 999077, Peoples R China
2.China Natl Environm Monitoring Ctr, Dept Ambient Air Qual Monitoring, Beijing 100012, Peoples R China
3.Hangzhou PuYu Technol Dev Co Ltd, Hangzhou 311300, Zhejiang, Peoples R China
4.Colorado State Univ, Dept Atmospher Sci, Ft Collins, CO 80523 USA
5.Colorado State Univ, Dept Chem, Ft Collins, CO 80523 USA
Recommended Citation
GB/T 7714
Peng, Xiang,Wang, Tao,Wang, Weihao,et al. Photodissociation of particulate nitrate as a source of daytime tropospheric Cl-2[J]. NATURE COMMUNICATIONS,2022,13(1):939.
APA Peng, Xiang.,Wang, Tao.,Wang, Weihao.,Ravishankara, A. R..,George, Christian.,...&Chen, Jianmin.(2022).Photodissociation of particulate nitrate as a source of daytime tropospheric Cl-2.NATURE COMMUNICATIONS,13(1),939.
MLA Peng, Xiang,et al."Photodissociation of particulate nitrate as a source of daytime tropospheric Cl-2".NATURE COMMUNICATIONS 13.1(2022):939.
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