Daytime isoprene nitrates under changing NO<sub><i>x</i></sub> and O<sub>3</sub>
<p>Organonitrates are important species in the atmosphere due to their impacts on NO<span class="inline-formula"><sub><i>x</i></sub></span>, HO<span class="inline-formula"><sub><i>x</i></sub></span>, an...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2023-07-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://acp.copernicus.org/articles/23/8473/2023/acp-23-8473-2023.pdf |
| _version_ | 1797768717127385088 |
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| author | A. W. Mayhew P. M. Edwards J. F. Hamilton J. F. Hamilton |
| author_facet | A. W. Mayhew P. M. Edwards J. F. Hamilton J. F. Hamilton |
| author_sort | A. W. Mayhew |
| collection | DOAJ |
| description | <p>Organonitrates are important species in the atmosphere due to their impacts on NO<span class="inline-formula"><sub><i>x</i></sub></span>, HO<span class="inline-formula"><sub><i>x</i></sub></span>, and O<span class="inline-formula"><sub>3</sub></span> budgets, and their potential to contribute to secondary organic aerosol (SOA) mass. This work presents a steady-state modelling approach to assess the impacts of changes in NO<span class="inline-formula"><sub><i>x</i></sub></span> and O<span class="inline-formula"><sub>3</sub></span> concentrations on the organonitrates produced from
isoprene oxidation. The diverse formation pathways to isoprene organonitrates dictate the responses of different groups of organonitrates
to changes in O<span class="inline-formula"><sub>3</sub></span> and NO<span class="inline-formula"><sub><i>x</i></sub></span>. For example, organonitrates predominantly formed from the OH-initiated oxidation of isoprene favour
formation under lower-ozone and moderate-NO<span class="inline-formula"><sub><i>x</i></sub></span> concentrations, whereas
organonitrates formed via daytime NO<span class="inline-formula"><sub>3</sub></span> oxidation show the highest
formation under high-O<span class="inline-formula"><sub>3</sub></span> concentrations with little dependence on
NO<span class="inline-formula"><sub><i>x</i></sub></span> concentrations. Investigating the response of total organonitrates
reveals complex and nonlinear behaviour with implications that could inform
expectations of changes to organonitrate concentrations as efforts are made
to reduce NO<span class="inline-formula"><sub><i>x</i></sub></span> and O<span class="inline-formula"><sub>3</sub></span> concentrations, including a region of
NO<span class="inline-formula"><sub><i>x</i></sub></span>–O<span class="inline-formula"><sub>3</sub></span> space where total organonitrate concentration is relatively insensitive to changes in NO<span class="inline-formula"><sub><i>x</i></sub></span> and O<span class="inline-formula"><sub>3</sub></span>. These conclusions are further contextualised by estimating the volatility of the isoprene organonitrates revealing the potential for high concentrations of low-volatility species under high-ozone conditions.</p> |
| first_indexed | 2024-03-12T20:58:20Z |
| format | Article |
| id | doaj.art-afb774ca09f54c49b2c8db6af952aa53 |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-03-12T20:58:20Z |
| publishDate | 2023-07-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-afb774ca09f54c49b2c8db6af952aa532023-07-31T12:28:24ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242023-07-01238473848510.5194/acp-23-8473-2023Daytime isoprene nitrates under changing NO<sub><i>x</i></sub> and O<sub>3</sub>A. W. Mayhew0P. M. Edwards1J. F. Hamilton2J. F. Hamilton3Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, Heslington, York, UKWolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, Heslington, York, UKWolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, Heslington, York, UKNational Centre for Atmospheric Science, University of York, York, UK<p>Organonitrates are important species in the atmosphere due to their impacts on NO<span class="inline-formula"><sub><i>x</i></sub></span>, HO<span class="inline-formula"><sub><i>x</i></sub></span>, and O<span class="inline-formula"><sub>3</sub></span> budgets, and their potential to contribute to secondary organic aerosol (SOA) mass. This work presents a steady-state modelling approach to assess the impacts of changes in NO<span class="inline-formula"><sub><i>x</i></sub></span> and O<span class="inline-formula"><sub>3</sub></span> concentrations on the organonitrates produced from isoprene oxidation. The diverse formation pathways to isoprene organonitrates dictate the responses of different groups of organonitrates to changes in O<span class="inline-formula"><sub>3</sub></span> and NO<span class="inline-formula"><sub><i>x</i></sub></span>. For example, organonitrates predominantly formed from the OH-initiated oxidation of isoprene favour formation under lower-ozone and moderate-NO<span class="inline-formula"><sub><i>x</i></sub></span> concentrations, whereas organonitrates formed via daytime NO<span class="inline-formula"><sub>3</sub></span> oxidation show the highest formation under high-O<span class="inline-formula"><sub>3</sub></span> concentrations with little dependence on NO<span class="inline-formula"><sub><i>x</i></sub></span> concentrations. Investigating the response of total organonitrates reveals complex and nonlinear behaviour with implications that could inform expectations of changes to organonitrate concentrations as efforts are made to reduce NO<span class="inline-formula"><sub><i>x</i></sub></span> and O<span class="inline-formula"><sub>3</sub></span> concentrations, including a region of NO<span class="inline-formula"><sub><i>x</i></sub></span>–O<span class="inline-formula"><sub>3</sub></span> space where total organonitrate concentration is relatively insensitive to changes in NO<span class="inline-formula"><sub><i>x</i></sub></span> and O<span class="inline-formula"><sub>3</sub></span>. These conclusions are further contextualised by estimating the volatility of the isoprene organonitrates revealing the potential for high concentrations of low-volatility species under high-ozone conditions.</p>https://acp.copernicus.org/articles/23/8473/2023/acp-23-8473-2023.pdf |
| spellingShingle | A. W. Mayhew P. M. Edwards J. F. Hamilton J. F. Hamilton Daytime isoprene nitrates under changing NO<sub><i>x</i></sub> and O<sub>3</sub> Atmospheric Chemistry and Physics |
| title | Daytime isoprene nitrates under changing NO<sub><i>x</i></sub> and O<sub>3</sub> |
| title_full | Daytime isoprene nitrates under changing NO<sub><i>x</i></sub> and O<sub>3</sub> |
| title_fullStr | Daytime isoprene nitrates under changing NO<sub><i>x</i></sub> and O<sub>3</sub> |
| title_full_unstemmed | Daytime isoprene nitrates under changing NO<sub><i>x</i></sub> and O<sub>3</sub> |
| title_short | Daytime isoprene nitrates under changing NO<sub><i>x</i></sub> and O<sub>3</sub> |
| title_sort | daytime isoprene nitrates under changing no sub i x i sub and o sub 3 sub |
| url | https://acp.copernicus.org/articles/23/8473/2023/acp-23-8473-2023.pdf |
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