Abundance of NO<sub>3</sub> Derived Organo-Nitrates and Their Importance in the Atmosphere
The chemistry of the nitrate radical and its contribution to organo-nitrate formation in the troposphere has been investigated using a mesoscale 3-D chemistry and transport model, WRF-Chem-CRI. The model-measurement comparisons of NO<sub>2</sub>, ozone and night-time N<sub>2</su...
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| Autores principales: | , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/a6ff8576f5974affb2a29aa440cf732a |
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| Sumario: | The chemistry of the nitrate radical and its contribution to organo-nitrate formation in the troposphere has been investigated using a mesoscale 3-D chemistry and transport model, WRF-Chem-CRI. The model-measurement comparisons of NO<sub>2</sub>, ozone and night-time N<sub>2</sub>O<sub>5</sub> mixing ratios show good agreement supporting the model’s ability to represent nitrate (NO<sub>3</sub>) chemistry reasonably. Thirty-nine organo-nitrates in the model are formed exclusively either from the reaction of RO<sub>2</sub> with NO or by the reaction of NO<sub>3</sub> with alkenes. Temporal analysis highlighted a significant contribution of NO<sub>3</sub>-derived organo-nitrates, even during daylight hours. Night-time NO<sub>3</sub>-derived organo-nitrates were found to be 3-fold higher than that in the daytime. The reactivity of daytime NO<sub>3</sub> could be more competitive than previously thought, with losses due to reaction with VOCs (and subsequent organo-nitrate formation) likely to be just as important as photolysis. This has highlighted the significance of NO<sub>3</sub> in daytime organo-nitrate formation, with potential implications for air quality, climate and human health. Estimated atmospheric lifetimes of organo-nitrates showed that the organo-nitrates act as NO<sub>x</sub> reservoirs, with particularly short-lived species impacting on air quality as contributors to downwind ozone formation. |
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