Atmospheric gaseous hydrochloric and hydrobromic acid in urban Beijing, China : detection, source identification and potential atmospheric impacts

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Fan , X , Cai , J , Yan , C , Zhao , J , Guo , Y , Li , C , Dällenbach , K , Zheng , F , Lin , Z , Chu , B , Wang , Y , Dada , L , Zha , Q , Du , W , Kontkanen , J , Kurten , T , Iyer , S , Kujansuu , J T , Petäjä , T , Worsnop , D R , Kerminen , V-M , Liu , Y , Bianchi , F , Tham , Y J , Yao , L & Kulmala , M 2021 , ' Atmospheric gaseous hydrochloric and hydrobromic acid in urban Beijing, China : detection, source identification and potential atmospheric impacts ' , Atmospheric Chemistry and Physics , vol. 21 , no. 14 , pp. 11437-11452 . https://doi.org/10.5194/acp-21-11437-2021

Title: Atmospheric gaseous hydrochloric and hydrobromic acid in urban Beijing, China : detection, source identification and potential atmospheric impacts
Author: Fan, Xiaolong; Cai, Jing; Yan, Chao; Zhao, Jian; Guo, Yishuo; Li, Chang; Dällenbach, Kaspar; Zheng, Feixue; Lin, Zhuohui; Chu, Biwu; Wang, Yonghong; Dada, Lubna; Zha, Qiaozhi; Du, Wei; Kontkanen, Jenni; Kurten, Theo; Iyer, Siddhart; Kujansuu, Joni T.; Petäjä, Tuukka; Worsnop, Douglas R.; Kerminen, Veli-Matti; Liu, Yongchun; Bianchi, Federico; Tham, Yee Jun; Yao, Lei; Kulmala, Markku
Other contributor: University of Helsinki, Air quality research group
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, INAR Physics
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, INAR Physical Chemistry
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Polar and arctic atmospheric research (PANDA)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)






Date: 2021-07-29
Language: eng
Number of pages: 16
Belongs to series: Atmospheric Chemistry and Physics
ISSN: 1680-7316
DOI: https://doi.org/10.5194/acp-21-11437-2021
URI: http://hdl.handle.net/10138/333077
Abstract: Gaseous hydrochloric (HCl) and hydrobromic acid (HBr) are vital halogen species that play essential roles in tropospheric physicochemical processes. Yet, the majority of the current studies on these halogen species were conducted in marine or coastal areas. Detection and source identification of HCl and HBr in inland urban areas remain scarce, thus limiting the full understanding of halogen chemistry and potential atmospheric impacts in the environments with limited influence from the marine sources. Here, both gaseous HCl and HBr were concurrently measured in urban Beijing, China, during winter and early spring of 2019. We observed significant HCl and HBr concentrations ranging from a minimum value at 1 x 10(8) molecules cm(-3) (4 ppt) and 4 x 10(7) molecules cm 3 (1 ppt) up to 6 x 10(9) molecules cm(-3) (222 ppt) and 1 x 10(9) molecules cm(-3) (37 ppt), respectively. The HCl and HBr concentrations are enhanced along with the increase of atmospheric temperature, UVB and levels of gaseous HNO3. Based on the air mass analysis and high correlations of HCl and HBr with the burning indicators (HCN and HCNO), gaseous HCl and HBr are found to be related to anthropogenic burning aerosols. The gas-particle partitioning may also play a dominant role in the elevated daytime HCl and HBr. During the daytime, the reactions of HCl and HBr with OH radicals lead to significant production of atomic Cl and Br, up to 2 x 10(4) molecules cm(-3) s(-1) and 8 x 10(4) molecules cm(-3) s(-1), respectively. The production rate of atomic Br (via HBr + OH) is 2-3 times higher than that of atomic Cl (via HCl + OH), highlighting the potential importance of bromine chemistry in the urban area. On polluted days, the production rates of atomic Cl and Br are faster than those on clean days. Furthermore, our observations of elevated HCl and HBr may suggest an important recycling pathway of halogen species in inland megacities and may provide a plausible explanation for the widespread halogen chemistry, which could affect the atmospheric oxidation in China.
Subject: 116 Chemical sciences
SEGREGATED PARTICLE NUMBER
FINE PARTICULATE CHLORIDE
HETEROGENEOUS N2O5 UPTAKE
NITRYL CHLORIDE
SUBMICRON AEROSOLS
POWER-PLANT
CHEMISTRY
CLNO2
EMISSIONS
BROMINE
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