Photodissociation of particulate nitrate as a source of daytime tropospheric Cl2

Xiang Peng, Tao Wang (), Weihao Wang, A. R. Ravishankara, Christian George, Men Xia, Min Cai, Qinyi Li, Christian Mark Salvador, Chiho Lau, Xiaopu Lyu, Chun Nan Poon, Abdelwahid Mellouki, Yujing Mu, Mattias Hallquist, Alfonso Saiz-Lopez, Hai Guo, Hartmut Herrmann, Chuan Yu, Jianing Dai, Yanan Wang, Xinke Wang, Alfred Yu, Kenneth Leung, Shuncheng Lee and Jianmin Chen
Additional contact information
Xiang Peng: the Hong Kong Polytechnic University
Tao Wang: the Hong Kong Polytechnic University
Weihao Wang: the Hong Kong Polytechnic University
A. R. Ravishankara: Colorado State University
Christian George: Univ Lyon, Université Claude Bernard Lyon 1, CNRS, IRCELYON
Men Xia: the Hong Kong Polytechnic University
Min Cai: Institut de Combustion, Aérothermique, Réactivité et Environnement (ICARE), CNRS/OSUC
Qinyi Li: Institute of Physical Chemistry Rocasolano, CSIC
Christian Mark Salvador: University of Gothenburg
Chiho Lau: Air Science Group Environmental Protection Department, HKSAR
Xiaopu Lyu: the Hong Kong Polytechnic University
Chun Nan Poon: the Hong Kong Polytechnic University
Abdelwahid Mellouki: Institut de Combustion, Aérothermique, Réactivité et Environnement (ICARE), CNRS/OSUC
Yujing Mu: Chinese Academy of Sciences
Mattias Hallquist: University of Gothenburg
Alfonso Saiz-Lopez: Institute of Physical Chemistry Rocasolano, CSIC
Hai Guo: the Hong Kong Polytechnic University
Hartmut Herrmann: Leibniz Institute for Tropospheric Research (TROPOS), Atmospheric Chemistry Department (ACD)
Chuan Yu: the Hong Kong Polytechnic University
Jianing Dai: the Hong Kong Polytechnic University
Yanan Wang: the Hong Kong Polytechnic University
Xinke Wang: Univ Lyon, Université Claude Bernard Lyon 1, CNRS, IRCELYON
Alfred Yu: Air Science Group Environmental Protection Department, HKSAR
Kenneth Leung: Air Science Group Environmental Protection Department, HKSAR
Shuncheng Lee: the Hong Kong Polytechnic University
Jianmin Chen: Fudan University, Institute of Atmospheric Sciences

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: 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

Date: 2022
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DOI: 10.1038/s41467-022-28383-9

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