Preprints
https://doi.org/10.5194/egusphere-2023-3042
https://doi.org/10.5194/egusphere-2023-3042
04 Jan 2024
 | 04 Jan 2024

The Role of Naphthalene and Its Derivatives in the Formation of Secondary Organic Aerosols in the Yangtze River Delta Region, China

Fei Ye, Jingyi Li, Yaqin Gao, Hongli Wang, Jingyu An, Cheng Huang, Song Guo, Keding Lu, Kangjia Gong, Haowen Zhang, Momei Qin, and Jianlin Hu

Abstract. Naphthalene (Nap) and its derivatives, including 1-methylnaphthalene (1-MN) and 2-methylnaphthalene (2-MN), serve as prominent intermediate volatile organic compounds (IVOCs) contributing to the formation of secondary organic carbon (SOC). In this study, the Community Multi-Scale Air Quality (CMAQ) model coupled with detailed emissions and reactions of these compounds was utilized to examine their roles in the formation of SOC and other secondary pollutants in the Yangtze River Delta (YRD) region during summer. Remarkably, significant underestimations of Nap and MN concentrations (by 79 % and 85 %) were observed at the Taizhou site. To better capture the temporal variations of Nap and MN, their emissions in the YRD region were scaled up by a factor of 5 and 7, respectively, with constraints based on field measurements. After adjusting their emissions, Nap concentrations reached 27 ppt in the YRD, accounting for 4.1 % and 9.1 % (up to 13.7 %) of total aromatics emissions and aromatic-derived SOC, respectively. 1-MN and 2-MN were relatively low, with an average of 3 and 6 ppt in the YRD, and contributed 3.1 % of aromatic-derived SOC. The influences of Nap and MN oxidation on ozone and radicals might be trivial on a regional scale but were not negligible when considering daily fluctuations, particularly in Shanghai and Suzhou. This study emphasizes the high SOC formation potentials of Nap and MN, which may pose environmental risks and adverse health.

Fei Ye, Jingyi Li, Yaqin Gao, Hongli Wang, Jingyu An, Cheng Huang, Song Guo, Keding Lu, Kangjia Gong, Haowen Zhang, Momei Qin, and Jianlin Hu

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-3042', Anonymous Referee #1, 22 Jan 2024
  • RC2: 'Comment on egusphere-2023-3042', Anonymous Referee #2, 25 Jan 2024
Fei Ye, Jingyi Li, Yaqin Gao, Hongli Wang, Jingyu An, Cheng Huang, Song Guo, Keding Lu, Kangjia Gong, Haowen Zhang, Momei Qin, and Jianlin Hu
Fei Ye, Jingyi Li, Yaqin Gao, Hongli Wang, Jingyu An, Cheng Huang, Song Guo, Keding Lu, Kangjia Gong, Haowen Zhang, Momei Qin, and Jianlin Hu

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Short summary
The gas-phase chemistry and formation of secondary organic aerosols (SOA) from naphthalene and methylnaphthalene have not been explicitly addressed in models, leaving their contributions unquantified at regional scales. In this study, we incorporated their emissions and SOA parameterizations into an air quality model, revealing the significant potential of these compounds for forming SOA with minimal atmospheric emissions in highly polluted environment like China.