Preprints
https://doi.org/10.5194/acp-2022-757
https://doi.org/10.5194/acp-2022-757
 
19 Jan 2023
19 Jan 2023
Status: this preprint is currently under review for the journal ACP.

Effects of long-range transport of air pollutants on nitrogenous organic matters in mountain background region of Southeast China: Sources and influencing factors identified by observation and modal calculation

Yanqin Ren1, Gehui Wang2, Jie Wei3, Jun Tao4, Zhisheng Zhang4, and Hong Li1 Yanqin Ren et al.
  • 1State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
  • 2Key Lab of Geographic Information Science of Ministry of Education of China, School of Geographic Sciences, East China Normal University, Shanghai 200142, China
  • 3Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
  • 4South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou, 510655, China

Abstract. Nitrated aromatic compounds (NACs), a major component of brown carbon (BrC), have a significant role in the atmosphere’s ability to absorb light. Despite this, the sources and major influencing variables of the mountain background atmosphere are mostly lacking. The current work is based on a thorough field investigation of NACs from fine particle samples taken in 2014 and 2015 at the peak of Mt. Wuyi (1139 meters above sea level) and includes a thorough examination of the seasonal fluctuations in their composition, sources, and significant influencing factors. As a result of the air masses traveling mostly via northern heating zones, the total abundance of nine quantifiable NACs increased significantly in the winter (3.9 ± 1.5 ng m-3) and autumn (2.1± 0.94 ng m-3), whereas it decreased in the spring (1.3 ± 0.75 ng m-3) and summer (0.97 ± 0.36 ng m-3). The most prevalent NAC species during the year was 4- nitrocatechol (25.8 %), followed by 5-nitroguaiacol (17.6 %). In addition, the majority of NACs (93 %) were influenced by coal, biomass, and petroleum combustion over the entire year, according to the results of structural equation modeling (SEM). Pollutant movement had a significant impact on the atmospheric NACs at the peak of Mt. Wuyi, especially in the winter (93.4 %) and spring (68.7 %). Long-range transport of nitration reactions was the dominant style in the transport process during the winter (33.7 %), while long-range transport of mixed sources was significant throughout the other seasons (14 %–37 %). In particular, for 4-nitrocatechol, NO2 may enhance the generation of NACs with a major impact on their compositions. Under low-NOx conditions, the formation of NACs was comparatively sensitive to NO2, suggesting that NACs would become significant in the aerosol characteristics when nitrate concentrations decreased as a result of emission reduction measures.

Yanqin Ren et al.

Status: open (until 02 Mar 2023)

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Yanqin Ren et al.

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Short summary
Nine quantified Nitrated aromatic compounds (NACs) in PM2.5 were examined at the peak of Mt. Wuyi. They manifested a significant rise in overall abundance in the winter and autumn. The transport of contaminants had a significant impact on NACs. Under low-NOx conditions, the formation of NACs was comparatively sensitive to NO2, suggesting that NACs would become significant in the aerosol characteristics when nitrate concentrations decreased as a result of emission reduction measures.
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