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| Titel |
The role of reactive nitrogen chemistry in the photochemical and haze pollution in China: WRF-Chem simulations of HONO and N2O5 processes and their impact on ozone and aerosol nitrate |
| VerfasserIn |
Qinyi Li, Li Zhang, Tao Wang, Xiao Fu, Yee Jun Tham, Weihao Wang, Zhe Wang, Qiang Zhang |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250143771
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| Publikation (Nr.) |
 EGU/EGU2017-7524.pdf |
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| Zusammenfassung |
| Nitrous acid (HONO) is a major source of the hydroxyl radical in the polluted troposphere.
The heterogeneous uptake of dinitrogen pentoxide (N2O5) produces the particulate nitrate
and the nitryl chloride (ClNO2) hence the chlorine radical. The hydroxyl and chlorine
radicals initiate the degradation of volatile organic compounds which leads to the production
of ozone with the presence of nitrogen oxides (NOx). Photochemical (ozone) and haze
(particulate) pollution has raised huge concerns in China in recent years. However, the
collective role of HONO, N2O5 and ClNO2 chemistry in the formation of air pollution in
China is yet to be quantified. Weather Research and Forecasting model coupled
with Chemistry (WRF-Chem) has been incorporated with comprehensive reactive
nitrogen oxides mechanism (ReNOM), including the latest HONO sources, the
heterogeneous uptake of N2O5 and the subsequent ClNO2 production and chlorine
chemistry. The revised WRF-Chem was adopted to simulate the spatial-temporal
distribution of HONO, N2O5 and ClNO2, and to investigate the contribution of nitrogen
chemistry to the production of ozone and secondary aerosol in China in summer when
photochemical pollution is severe, and in winter season during which haze pollution
is alarming in northern China. The simulations showed that the reactive nitrogen
chemistry considerably increased the concentration of OH and Cl radical and hence the
degradation of VOCs and the production of ozone; the chemistry altered the lifetime
of NOx and enhanced the transformation of NOx into nitrate aerosol. Sensitivity
simulations were conducted by reducing the NOx and/or VOCs emission, and the
difference between the simulated ozone with original emission and that with reduced
emission will be used to identify the ozone formation regime in different areas of
China. The spatial pattern of the ozone formation regime in China suggested by
original and revised WRF-Chem will be compared and analyzed to explore the
potential role of reactive nitrogen chemistry in the formation of ozone control strategy. |
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