Preprints
https://doi.org/10.5194/amt-2020-520
https://doi.org/10.5194/amt-2020-520

  21 Jan 2021

21 Jan 2021

Review status: a revised version of this preprint was accepted for the journal AMT and is expected to appear here in due course.

Thermal dissociation cavity enhanced absorption spectrometer for detecting NO2, RO2NO2 and RONO2 in the atmosphere

Chunmeng Li1, Haichao Wang1,2,3, Xiaorui Chen1, Tianyu Zhai1, Shiyi Chen1, Xin Li1, Limin Zeng1, and Keding Lu1 Chunmeng Li et al.
  • 1State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China
  • 2School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai, Guangdong, 510275, China
  • 3Guangdong Provincial Observation and Research Station for Climate Environment and Air Quality Change in the Pearl River Estuary, Key Laboratory of Tropical Atmosphere-Ocean System, Ministry of Education, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, 519082, China

Abstract. We developed a thermal dissociation cavity enhanced absorption spectroscopy (TD-CEAS) for the in-situ measurement of NO2, total peroxy nitrates (PNs, RO2NO2), and total alkyl nitrates (ANs, RONO2) in the atmosphere. PNs and ANs are thermally converted to NO2 at the corresponding pyrolysis temperatures and detected by CEAS at 435–455 nm. The instrument samples sequentially from three channels at ambient temperature, 453 K and 653 K, with a cycle of 3 minutes, for measuring NO2, NO2+PNs, and NO2+PNs+ANs, respectively. The absorptions between the three channels are used to derive the mixing ratios of PNs and ANs by the spectral fitting. The limit of detection (LOD) is estimated to be 97 pptv (1σ) at 6 s intervals for NO2. The measurement uncertainty of NO2 is estimated to be 8 %, while the uncertainties of PNs and ANs detection is larger than NO2 due to some chemical interferences in the heating channels, such as the reaction of NO (or NO2) with the peroxy radicals produced by the thermal dissociation of organic nitrates. Based on the laboratory experiments and numerical simulations, we set up a lookup table method to correct these interferences in PNs and ANs channel under various concentrations of ambient organic nitrates, NO, and NO2. Finally, we present the first field deployment and compared it with other instruments during a field campaign in China, the advantage and limitations of this instrument are outlined.

Chunmeng Li et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2020-520', Anonymous Referee #1, 17 Feb 2021
    • AC1: 'Reply on RC1', Keding Lu, 23 Apr 2021
  • RC2: 'Comment on amt-2020-520', Anonymous Referee #2, 17 Feb 2021
    • AC2: 'Reply on RC2', Keding Lu, 23 Apr 2021
  • RC3: 'Comment on amt-2020-520', Anonymous Referee #3, 19 Feb 2021
    • AC3: 'Reply on RC3', Keding Lu, 23 Apr 2021

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2020-520', Anonymous Referee #1, 17 Feb 2021
    • AC1: 'Reply on RC1', Keding Lu, 23 Apr 2021
  • RC2: 'Comment on amt-2020-520', Anonymous Referee #2, 17 Feb 2021
    • AC2: 'Reply on RC2', Keding Lu, 23 Apr 2021
  • RC3: 'Comment on amt-2020-520', Anonymous Referee #3, 19 Feb 2021
    • AC3: 'Reply on RC3', Keding Lu, 23 Apr 2021

Chunmeng Li et al.

Chunmeng Li et al.

Viewed

Total article views: 381 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
269 95 17 381 33 6 9
  • HTML: 269
  • PDF: 95
  • XML: 17
  • Total: 381
  • Supplement: 33
  • BibTeX: 6
  • EndNote: 9
Views and downloads (calculated since 21 Jan 2021)
Cumulative views and downloads (calculated since 21 Jan 2021)

Viewed (geographical distribution)

Total article views: 394 (including HTML, PDF, and XML) Thereof 389 with geography defined and 5 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 05 May 2021
Download
Short summary
We present a feasible instrument for the detection of NO2, total peroxy nitrates (PNs, RO2NO2), and total alkyl nitrates (ANs, RONO2) in the atmosphere. The instrument samples sequentially from three channels at different temperature setting and then measures spectrums by one cavity enhanced absorption spectrometer. The concentration are determined by spectral fitting and corrected by lookup table method conveniently. The instrument will promote the study of PNs and ANs.