Chlorine oxidation of VOCs at a semi-rural site in Beijing : Significant chlorine liberation from ClNO2 and subsequent gas- A nd particle-phase Cl-VOC production

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Michael Le Breton
  • Åsa M. Hallquist
  • Ravi Kant Pathak
  • David Simpson
  • Yujue Wang
  • John Johansson
  • Jing Zheng
  • Yudong Yang
  • Dongjie Shang
  • Haichao Wang
  • Qianyun Liu
  • Tao Wang
  • Thomas J. Bannan
  • Michael Priestley
  • Carl J. Percival
  • Dudley E. Shallcross
  • Keding Lu
  • Song Guo
  • Min Hu
  • Mattias Hallquist

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)13013-13030
Journal / PublicationAtmospheric Chemistry and Physics
Volume18
Issue number17
Publication statusPublished - 11 Sep 2018

Link(s)

Abstract

Nitryl chloride (ClNO2) accumulation at night acts as a significant reservoir for active chlorine and impacts the following day's photochemistry when the chlorine atom is liberated at sunrise. Here, we report simultaneous measurements of N2O5 and a suite of inorganic halogens including ClNO2 and reactions of chloride with volatile organic compounds (Cl-VOCs) in the gas and particle phases utilising the Filter Inlet for Gas and AEROsols time-of-flight chemical ionisation mass spectrometer (FIGAERO-ToF-CIMS) during an intensive measurement campaign 40 km northwest of Beijing in May and June 2016. A maximum mixing ratio of 2900 ppt of ClNO2 was observed with a mean campaign nighttime mixing ratio of 487 ppt, appearing to have an anthropogenic source supported by correlation with SO2, CO and benzene, which often persisted at high levels after sunrise until midday. This was attributed to such high mixing ratios persisting after numerous e-folding times of the photolytic lifetime enabling the chlorine atom production to reach 2.3 × 10molecules cm-3 from ClNO2 alone, peaking at 09:30 LT and up to 8.4 × 10molecules cm-3 when including the supporting inorganic halogen measurements. 

Cl-VOCs were observed in the particle and gas phases for the first time at high time resolution and illustrate how the iodide ToF-CIMS can detect unique markers of chlorine atom chemistry in ambient air from both biogenic and anthropogenic sources. Their presence and abundance can be explained via time series of their measured and steady-state calculated precursors, enabling the assessment of competing OH and chlorine atom oxidation via measurements of products from both of these mechanisms and their relative contribution to secondary organic aerosol (SOA) formation.

Research Area(s)

  • SECONDARY ORGANIC AEROSOL, N2O5 UPTAKE COEFFICIENTS, NITRYL CHLORIDE, BOUNDARY-LAYER, MASS-SPECTROMETER, INITIATED OXIDATION, OZONE PRODUCTION, HIGH-RESOLUTION, ATOM CHEMISTRY, NORTHERN CHINA

Citation Format(s)

Chlorine oxidation of VOCs at a semi-rural site in Beijing : Significant chlorine liberation from ClNO2 and subsequent gas- A nd particle-phase Cl-VOC production. / Le Breton, Michael; Hallquist, Åsa M.; Kant Pathak, Ravi; Simpson, David; Wang, Yujue; Johansson, John; Zheng, Jing; Yang, Yudong; Shang, Dongjie; Wang, Haichao; Liu, Qianyun; Chan, Chak; Wang, Tao; Bannan, Thomas J.; Priestley, Michael; Percival, Carl J.; Shallcross, Dudley E.; Lu, Keding; Guo, Song; Hu, Min; Hallquist, Mattias.

In: Atmospheric Chemistry and Physics, Vol. 18, No. 17, 11.09.2018, p. 13013-13030.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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