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Efficient N2O5 uptake and NO3 oxidation in the outflow of urban Beijing

Journal article
Authors H. C. Wang
K. D. Lu
S. Guo
Z. J. Wu
D. J. Shang
Z. F. Tan
Y. J. Wang
Michael Le Breton
S. R. Lou
M. J. Tang
Y. S. Wu
W. F. Zhu
J. Zheng
L. M. Zeng
Mattias Hallquist
M. Hu
Y. H. Zhang
Published in Atmospheric Chemistry and Physics
Volume 18
Issue 13
Pages 9705-9721
ISSN 1680-7316
Publication year 2018
Published at Department of Chemistry and Molecular Biology
Pages 9705-9721
Language en
Links dx.doi.org/10.5194/acp-18-9705-2018
Keywords volatile organic-compounds, marine boundary-layer, north china plain, wrf-chem model, nitryl chloride, dinitrogen pentoxide, nighttime, chemistry, heterogeneous hydrolysis, uptake coefficients, mass-spectrometer, Meteorology & Atmospheric Sciences
Subject categories Environmental chemistry, Environmental Sciences, Meteorology and Atmospheric Sciences, Physical Chemistry, Analytical Chemistry, Chemical Sciences, Climate Research

Abstract

Nocturnal reactive nitrogen compounds play an important role in regional air pollution. Here we present the measurements of dinitrogen pentoxide (N2O5) associated with nitryl chloride (ClNO2) and particulate nitrate (pNO(3)(-)) at a suburban site of Beijing in the summer of 2016. High levels of N2O5 and ClNO2 were observed in the outflow of the urban Beijing air masses, with 1 min average maxima of 937 and 2900 pptv, respectively. The N2O5 uptake coefficients, gamma, and ClNO2 yield, f, were experimentally determined from the observed parameters. The N2O5 uptake coefficient ranged from 0.012 to 0.055, with an average of 0.034 +/- 0.018, which is in the upper range of previous field studies reported in North America and Europe but is a moderate value in the North China Plain (NCP), which reflects efficient N2O5 heterogeneous processes in Beijing. The ClNO2 yield exhibited high variability, with a range of 0.50 to unity and an average of 0.73 +/- 0.25. The concentration of the nitrate radical (NO3) was calculated assuming that the thermal equilibrium between NO3 and N2O5 was maintained. In NOx-rich air masses, the oxidation of nocturnal biogenic volatile organic compounds (BVOCs) was dominated by NO3 rather than O-3. The production rate of organic nitrate (ON) via NO3 + BVOCs was significant, with an average of 0.10 +/- 0.07 ppbvh(-1). We highlight the importance of NO3 oxidation of VOCs in the formation of ON and subsequent secondary organic aerosols in summer in Beijing.

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