the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
17 Feb 2021
17 Feb 2021
Impact of firework on nitrooxy-organosulfates in urban aerosols during Chinese New Year Eve
- 1Institute of Surface-Earth System Science, School of Earth System Science, Tianjin University, Tianjin 300072, China
- 2LAPC, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
- 3School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China
- 4School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham, B15 2TT, UK
- 5Max Planck Institute for Chemistry, Multiphase Chemistry Department, Hahn-Meitner-Weg 1, 55128 Mainz, Germany
- 6Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong
- 7Chinese Research Academy of Environmental Sciences, Beijing 100012, China
- 8State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Science, Chinese Academy of Sciences, Beijing 100085, China
- 9Department of Chemistry, California University, Irvine, California 92697-2025, United States
- 10Chubu Institute for Advanced Studies, Chubu University, Kasugai 487-8501, Japan
- 1Institute of Surface-Earth System Science, School of Earth System Science, Tianjin University, Tianjin 300072, China
- 2LAPC, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
- 3School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China
- 4School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham, B15 2TT, UK
- 5Max Planck Institute for Chemistry, Multiphase Chemistry Department, Hahn-Meitner-Weg 1, 55128 Mainz, Germany
- 6Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong
- 7Chinese Research Academy of Environmental Sciences, Beijing 100012, China
- 8State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Science, Chinese Academy of Sciences, Beijing 100085, China
- 9Department of Chemistry, California University, Irvine, California 92697-2025, United States
- 10Chubu Institute for Advanced Studies, Chubu University, Kasugai 487-8501, Japan
Abstract. Little is known about the formation processes of nitrooxy-organosulfates (nitrooxy-OSs) by nighttime chemistry. Here we characterize nitrooxy-OSs at a molecular level in firework-related aerosols in urban Beijing during Chinese New Year. High-molecular-weight nitrooxy-OSs with relatively low H / C and O / C ratios and high unsaturation, which are potentially aromatic-like nitrooxy-OSs, considerably increased during the New Year’s Eve. We find that large quantities of carboxylic-rich alicyclic molecules possibly formed by nighttime reactions. The sufficient abundance of aliphatic-like and aromatic-like nitrooxy-OSs demonstrates that both anthropogenic and biogenic volatile organic compounds are essential precursors of urban secondary organic aerosols (SOA). Besides, more than 98 % of nitrooxy-OSs were extremely low-volatile organic compounds that could easily partition into and consist in the particle phase, and affected the volatility, hygroscopicity, and even toxicity of urban aerosols. Our study provides new insights into the formation of nitrooxy-organosulfates from anthropogenic emissions through nighttime chemistry in the urban atmosphere.
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Qiaorong Xie et al.
Status: open (extended)
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RC1: 'Comment on acp-2021-67', Anonymous Referee #1, 23 Mar 2021
reply
In this manicurist, Xie et al measured the nitrooxy-organosulfates (nitrooxy-OS) in the aerosols during Chinese New Year Eve and aimed at discussing the impact of firework on nitrooxy-OS formation. The paper is well written and in general intriguing. It provides unique information on the molecular characterization, classification and precursors of nitrooxy-OS in ambient aerosols during firework events. This information will help us better understand the formation pathways of nitrooxy-OS and importance of nighttime chemistry/aqueous chemistry under ambient conditions. Therefore, I recommend publication of this manuscript as long as the following concerns are properly addressed.
1. The title emphasizes “impact of firework”, but there is no discussion on “firework” in the abstract part at all. It seems that “impact of firework” is not the whole story of this paper. Either of the title or the abstract should be revised accordingly for consistency of the paper.
2. Nighttime chemistry is one focus of this manuscript. Can the authors provide more information (e.g., meteorological condition, NOx/O3 concentrations, and if possible, VOC and aerosol chemical composition) to support their discussion on nighttime nitrooxy-OS formation during the focused time period?
3. Although presented in the table and figures, little discussion is made on the comparison between LNY D and LNYN. It is suggested that a few sentences discussion is added to show the unique situation of firework during the NYE N.
4. From Figure 3, it can be concluded that all nitrooxy-OS categories are enhanced during NYE N. So what category is driven by the firework emission, and what is mainly due to the enhancement of nighttime chemistry? The current discussion is not clear enough.
Qiaorong Xie et al.
Qiaorong Xie et al.
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