Preprints
https://doi.org/10.5194/acp-2021-364
https://doi.org/10.5194/acp-2021-364

  04 May 2021

04 May 2021

Review status: this preprint is currently under review for the journal ACP.

Formation of condensable organic vapors from anthropogenic and biogenic VOCs is strongly perturbed by NOx in eastern China

Yuliang Liu1,2, Wei Nie1,2, Yuanyuan Li1,2, Dafeng Ge1,2, Chong Liu1,2, Zhengning Xu1,2,5, Liangduo Chen1,2, Tianyi Wang1,2,10, Lei Wang1,2, Peng Sun1,2, Ximeng Qi1,2, Jiaping Wang1,2, Zheng Xu1,2, Jian Yuan1,2, Chao Yan3, Yanjun Zhang3,9, Dandan Huang4, Zhe Wang6, Neil M. Donahue7, Douglas Worsnop8, Xuguang Chi1,2, Mikael Ehn3, and Aijun Ding1,2 Yuliang Liu et al.
  • 1Joint International Research Laboratory of Atmospheric and Earth System Sciences, School of Atmospheric Sciences, Nanjing University, Nanjing, Jiangsu Province, China
  • 2Collaborative Innovation Center of Climate Change, Jiangsu Province, China
  • 3Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, Helsinki, Finland
  • 4State Environmental Protection Key Laboratory of Formation and Prevention of Urban Air Pollution Complex, Shanghai Academy of Environmental Sciences, Shanghai, China
  • 5College of Environmental & Resource Sciences, Zhejiang University, Zhejiang, China
  • 6Department of Civil and Environmental Engineering, the Hong Kong Polytechnic University, Hong Kong SAR
  • 7Center for Atmospheric Particle Studies, Carnegie Mellon University, Pittsburgh, PA, USA
  • 8Center for Aerosol and Cloud Chemistry, Aerodyne Research Inc., Billerica, MA, USA
  • 9Univ. Lyon, Université Claude Bernard Lyon 1, CNRS, IRCELYON, 69626, Villeurbanne, France
  • 10Meteorological Service Center of Hubei Province, Wuhan, 430074

Abstract. Oxygenated organic molecules (OOMs) are the crucial intermediates linking volatile organic compounds (VOCs) to secondary organic aerosol (SOA) in the atmosphere, but understandings on the characteristics of OOMs and their formations from VOCs are very limited. Ambient observations of OOMs using recently developed mass spectrometry techniques are still limited, especially in polluted urban atmosphere where VOCs and oxidants are extremely variable and complex. Here, we investigate OOMs, measured by a nitrate-ion-based chemical ionization mass spectrometer at Nanjing in eastern China, through performing positive matrix factorization on binned mass spectra (binPMF). The binPMF analysis reveals three factors about anthropogenic VOCs (AVOCs) daytime chemistry, three isoprene-related factors, three factors about biogenic VOCs (BVOCs) nighttime chemistry, and three factors about nitrated phenols. All factors are influenced by NOx in different ways and to different extents. Over 1000 non-nitro molecules have been identified and then reconstructed from the selected solution of binPMF, and about 72 % of the total signals are contributed by nitrogen-containing OOMs, mostly regarded as organic nitrates formed through peroxy radicals terminated by nitric oxide or nitrate-radical-initiated oxidations. Moreover, multi-nitrates account for about 24 % of the total signals, indicating the significant presence of multiple generations, especially for isoprene (e.g., C5H10O8N2 and C5H9O10N3). Additionally, the distribution of OOMs concentration on carbon number confirm their precursors driven by AVOCs mixed with enhanced BVOCs during summer. Our results highlight the decisive role of NOx on OOMs formation in densely populated areas, and encourage more studies on the dramatic interactions between anthropogenic and biogenic emissions.

Yuliang Liu et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-364', Anonymous Referee #1, 18 Jun 2021
  • RC2: 'Comment on acp-2021-364', Anonymous Referee #2, 24 Jun 2021

Yuliang Liu et al.

Yuliang Liu et al.

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Short summary
Oxygenated organic molecules (OOMs) are the crucial intermediates linking volatile organic compounds to secondary organic aerosol. Here, we investigated OOMs measured by nitrate TOF-CIMS in eastern China, though performing positive matrix factorization on binned mass spectra. We reconstructed more than 1000 molecules from 14 derived PMF factors and identified 72 % of the observed OOMs as organic nitrates, highlighting the decisive role of nitrogen chemistry on OOMs formation in populated areas.
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