Preprints
https://doi.org/10.5194/amt-2020-474
https://doi.org/10.5194/amt-2020-474

  28 Dec 2020

28 Dec 2020

Review status: a revised version of this preprint is currently under review for the journal AMT.

Estimation of particulate organic nitrates from thermodenuder-aerosol mass spectrometer measurements in North China Plain

Weiqi Xu1, Masayuki Takeuchi2, Chun Chen1,3, Yanmei Qiu1,3, Conghui Xie1,3,a, Wanyun Xu4, Nan Ma5, Douglas R. Worsnop6, Nga Lee Ng2,7,8, and Yele Sun1,3,9 Weiqi Xu et al.
  • 1State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
  • 2School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
  • 3College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
  • 4State Key Laboratory of Severe Weather & Key Laboratory for Atmospheric Chemistry, Institute of Atmospheric Composition, Chinese Academy of Meteorological Sciences, Beijing, 100081, China
  • 5Institute for Environmental and Climate Research, Jinan University, Guangzhou 511443, China
  • 6Aerodyne Research Inc., Billerica, Massachusetts 01821, USA
  • 7School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332, USA
  • 8School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
  • 9Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
  • anow at: State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China

Abstract. Particulate organic nitrates (pON) are an important component of secondary organic aerosol in biogenic emission dominant environments, and play a critical role in NOx cycles. However, estimation of pON has been a challenge in polluted environments, e.g., North China Plain with high concentrations of inorganic nitrate and NOx. Here we developed a method for estimation of pON from the measurements of high-resolution aerosol mass spectrometer coupled with a thermodenuder based on the volatility differences between inorganic nitrate and pON. The results generally correlated well with those estimated from positive matrix factorization of combined organic and inorganic mass spectra and from the ratio of NO+ to NO2+ (NOx+ ratio), yet had improvements in reducing negative values due to the influences of high concentration of inorganic nitrate and constant NOx+ ratio of organic nitrates (RON). By applying this approach to the measurements at an urban (Beijing) and a rural site (Gucheng) in summer and winter in North China Plain, we estimated that the average mass concentrations of NO3,org (1.8 µg m−3 vs.1.0 µg m−3) and pON to OA (27.5 % vs. 14.8 %) were higher in summer than in winter in Beijing, indicating more pON formation in biogenically and anthropogenically mixed environments. In addition, the average NO3,org loading in Gucheng was 1.9 µg m−3, and the pON at the rural site also showed higher contribution to OA than that in Beijing during wintertime due to higher primary emissions and gaseous precursors in Gucheng. In addition, RON was determined and showed considerable differences between day-night and clean-polluted periods, highlighting the complexity of pON compounds from different chemical pathways (e.g., OH and NO3 oxidation) and sources.

Weiqi Xu et al.

 
Status: final response (author comments only)
Status: final response (author comments only)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

Weiqi Xu et al.

Viewed

Total article views: 412 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
308 99 5 412 27 4 11
  • HTML: 308
  • PDF: 99
  • XML: 5
  • Total: 412
  • Supplement: 27
  • BibTeX: 4
  • EndNote: 11
Views and downloads (calculated since 28 Dec 2020)
Cumulative views and downloads (calculated since 28 Dec 2020)

Viewed (geographical distribution)

Total article views: 401 (including HTML, PDF, and XML) Thereof 400 with geography defined and 1 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 08 Apr 2021
Download
Short summary
Here we developed a method for estimation of Particulate organic nitrates (pON) from the measurements of high-resolution aerosol mass spectrometer coupled with a thermodenuder based on the volatility differences between inorganic nitrate and pON. The results generally had improvements in reducing negative values due to the influences of high concentration of inorganic nitrate and constant the ratio of NO+ to NO2+ of organic nitrates (RON).