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<p>Nitrate radical (NO<sub>3</sub>) and dinitrogen pentoxide (N<sub>2</sub>O<sub>5</sub>) play an important role in nocturnal tropospheric chemistry. Here we present the measurements of gas-phase NO<sub>3</sub> and N<sub>2</sub>O<sub>5</sub> by a cavity ringdown spectroscopy (CRDS) instrument from June 2 to June 22, 2017.The measurement site was in an urban area of Beijing, China as a part of the Air Pollution and Human Health (APHH) campaign. N<sub>2</sub>O<sub>5</sub> and NO<sub>3</sub> showed large day-to-day variations with average (± 1<i>σ</i>) mixing ratios of 88.5 ± 101.7 pptv and 8.3 ± 6.5 pptv, respectively. The heterogeneous N<sub>2</sub>O<sub>5</sub> uptake coefficient (<i>γ</i>N<sub>2</sub>O<sub>5</sub>) was retrieved from steady-state analysis. The estimated N<sub>2</sub>O<sub>5</sub> uptake coefficient ranged from 0.045 to 0.109, with an average of 0.083 ± 0.027. Further analysis revealed that the average NO<sub>3</sub> reactivity by the reaction with volatile organic compounds (VOCs) was 0.024&#xa0;s<sup>− 1</sup>. The oxidation of biologic volatile organic compounds (BVOCs) by NO<sub>3</sub> was an important pathway for the generations of organic nitrates (ONs) and secondary organic aerosols (SOA) at night. The ON production was 0.057 ppbv/h. The heterogeneous reaction of N<sub>2</sub>O<sub>5</sub> plays an important role in the formation of nitrate. The nitrate formations during the whole night were 24.05 ± 20.56&#xa0;µg/m<sup>3</sup> in Beijing. We highlight the importance of NO<sub>3</sub> oxidation of VOCs in the formation of ON and subsequent secondary organic aerosols in summer in Beijing.</p>

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Observations of NO3 and N2O5 in urban Beijing during APHH-Beijing campaign

  • 期刊论文

  • 发表日期：

    2025年7月7日

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  • Zhiyan Li,
  • Dan Wang,
  • Yuanyuan Qian,
  • Hao Chen

摘要

Nitrate radical (NO3) and dinitrogen pentoxide (N2O5) play an important role in nocturnal tropospheric chemistry. Here we present the measurements of gas-phase NO3 and N2O5 by a cavity ringdown spectroscopy (CRDS) instrument from June 2 to June 22, 2017.The measurement site was in an urban area of Beijing, China as a part of the Air Pollution and Human Health (APHH) campaign. N2O5 and NO3 showed large day-to-day variations with average (± 1σ) mixing ratios of 88.5 ± 101.7 pptv and 8.3 ± 6.5 pptv, respectively. The heterogeneous N2O5 uptake coefficient (γN2O5) was retrieved from steady-state analysis. The estimated N2O5 uptake coefficient ranged from 0.045 to 0.109, with an average of 0.083 ± 0.027. Further analysis revealed that the average NO3 reactivity by the reaction with volatile organic compounds (VOCs) was 0.024 s− 1. The oxidation of biologic volatile organic compounds (BVOCs) by NO3 was an important pathway for the generations of organic nitrates (ONs) and secondary organic aerosols (SOA) at night. The ON production was 0.057 ppbv/h. The heterogeneous reaction of N2O5 plays an important role in the formation of nitrate. The nitrate formations during the whole night were 24.05 ± 20.56 µg/m3 in Beijing. We highlight the importance of NO3 oxidation of VOCs in the formation of ON and subsequent secondary organic aerosols in summer in Beijing.