Formation and loss of light absorbance by phenolic aqueous SOA by <sup>⚫</sup>OH and an organic triplet excited state
<p>Brown carbon (BrC) is an important component of biomass-burning (BB) emissions that impacts Earth's radiation budget. BB directly emits primary BrC as well as gaseous phenolic compounds (ArOH), which react in the gas and aqueous phases with oxidants – such as hydroxyl radical (<span...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2024-04-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://acp.copernicus.org/articles/24/4473/2024/acp-24-4473-2024.pdf |
| _version_ | 1797202897123934208 |
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| author | S. Arciva L. Ma L. Ma C. Mavis C. Mavis C. Guzman C. Guzman C. Anastasio |
| author_facet | S. Arciva L. Ma L. Ma C. Mavis C. Mavis C. Guzman C. Guzman C. Anastasio |
| author_sort | S. Arciva |
| collection | DOAJ |
| description | <p>Brown carbon (BrC) is an important component of biomass-burning (BB) emissions that impacts Earth's radiation budget. BB directly emits primary BrC as well as gaseous phenolic compounds (ArOH), which react in the gas and aqueous phases with oxidants – such as hydroxyl radical (<span class="inline-formula"><sup><span class="Radical">⚫</span></sup></span>OH) and organic triplet excited states (<span class="inline-formula"><sup>3</sup></span>C<span class="inline-formula"><sup>∗</sup></span>) – to form light-absorbing secondary organic aerosol (SOA). These reactions in atmospheric aqueous phases, such as cloud/fog drops and aerosol liquid water (ALW), form aqueous SOA (aqSOA), i.e., low-volatility, high-molecular-weight products. While these are important routes of aqSOA formation, the light absorption and lifetimes of the BrC formed are poorly characterized. To study these aspects, we monitored the formation and loss of light absorption by aqSOA produced by reactions of six highly substituted phenols with <span class="inline-formula"><sup><span class="Radical">⚫</span></sup></span>OH and <span class="inline-formula"><sup>3</sup></span>C<span class="inline-formula"><sup>∗</sup></span>. While the parent phenols absorb very little tropospheric sunlight, they are oxidized to aqSOA that can absorb significant amounts of sunlight. The extent of light absorption by the aqSOA depends on both the ArOH precursor and oxidant: more light-absorbing aqSOA is formed from more highly substituted phenols and from triplet reactions rather than <span class="inline-formula"><sup><span class="Radical">⚫</span></sup></span>OH. Under laboratory conditions, extended reaction times in <span class="inline-formula"><sup><span class="Radical">⚫</span></sup></span>OH experiments diminish sunlight absorption by aqSOA on timescales of hours, while extended reaction times in <span class="inline-formula"><sup>3</sup></span>C<span class="inline-formula"><sup>∗</sup></span> experiments reduce light absorption much more slowly. Estimated lifetimes of light-absorbing phenolic aqSOA range from 3 to 17 h in cloud/fog drops, where <span class="inline-formula"><sup><span class="Radical">⚫</span></sup></span>OH is the major sink, and from 0.7 to 8 h in ALW, where triplet excited states are the major sink.</p> |
| first_indexed | 2024-04-24T08:10:44Z |
| format | Article |
| id | doaj.art-9740bbad723a47708cf09baf8938547d |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-04-24T08:10:44Z |
| publishDate | 2024-04-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-9740bbad723a47708cf09baf8938547d2024-04-17T05:29:34ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242024-04-01244473448510.5194/acp-24-4473-2024Formation and loss of light absorbance by phenolic aqueous SOA by <sup>⚫</sup>OH and an organic triplet excited stateS. Arciva0L. Ma1L. Ma2C. Mavis3C. Mavis4C. Guzman5C. Guzman6C. Anastasio7Department of Land, Air and Water Resources, University of California, Davis, One Shields Avenue, Davis, CA 95616-8627, USADepartment of Land, Air and Water Resources, University of California, Davis, One Shields Avenue, Davis, CA 95616-8627, USAnow at: SGS-CSTC Standards Technical Services Co. Ltd., Hangzhou, Zhejiang Province, 310052, ChinaDepartment of Land, Air and Water Resources, University of California, Davis, One Shields Avenue, Davis, CA 95616-8627, USAnow at: Department of Atmospheric Science, Colorado State University, Fort Collins, CO 80521, USADepartment of Land, Air and Water Resources, University of California, Davis, One Shields Avenue, Davis, CA 95616-8627, USAnow at: Department of Pharmacology, University of Washington, Seattle, WA 98195, USADepartment of Land, Air and Water Resources, University of California, Davis, One Shields Avenue, Davis, CA 95616-8627, USA<p>Brown carbon (BrC) is an important component of biomass-burning (BB) emissions that impacts Earth's radiation budget. BB directly emits primary BrC as well as gaseous phenolic compounds (ArOH), which react in the gas and aqueous phases with oxidants – such as hydroxyl radical (<span class="inline-formula"><sup><span class="Radical">⚫</span></sup></span>OH) and organic triplet excited states (<span class="inline-formula"><sup>3</sup></span>C<span class="inline-formula"><sup>∗</sup></span>) – to form light-absorbing secondary organic aerosol (SOA). These reactions in atmospheric aqueous phases, such as cloud/fog drops and aerosol liquid water (ALW), form aqueous SOA (aqSOA), i.e., low-volatility, high-molecular-weight products. While these are important routes of aqSOA formation, the light absorption and lifetimes of the BrC formed are poorly characterized. To study these aspects, we monitored the formation and loss of light absorption by aqSOA produced by reactions of six highly substituted phenols with <span class="inline-formula"><sup><span class="Radical">⚫</span></sup></span>OH and <span class="inline-formula"><sup>3</sup></span>C<span class="inline-formula"><sup>∗</sup></span>. While the parent phenols absorb very little tropospheric sunlight, they are oxidized to aqSOA that can absorb significant amounts of sunlight. The extent of light absorption by the aqSOA depends on both the ArOH precursor and oxidant: more light-absorbing aqSOA is formed from more highly substituted phenols and from triplet reactions rather than <span class="inline-formula"><sup><span class="Radical">⚫</span></sup></span>OH. Under laboratory conditions, extended reaction times in <span class="inline-formula"><sup><span class="Radical">⚫</span></sup></span>OH experiments diminish sunlight absorption by aqSOA on timescales of hours, while extended reaction times in <span class="inline-formula"><sup>3</sup></span>C<span class="inline-formula"><sup>∗</sup></span> experiments reduce light absorption much more slowly. Estimated lifetimes of light-absorbing phenolic aqSOA range from 3 to 17 h in cloud/fog drops, where <span class="inline-formula"><sup><span class="Radical">⚫</span></sup></span>OH is the major sink, and from 0.7 to 8 h in ALW, where triplet excited states are the major sink.</p>https://acp.copernicus.org/articles/24/4473/2024/acp-24-4473-2024.pdf |
| spellingShingle | S. Arciva L. Ma L. Ma C. Mavis C. Mavis C. Guzman C. Guzman C. Anastasio Formation and loss of light absorbance by phenolic aqueous SOA by <sup>⚫</sup>OH and an organic triplet excited state Atmospheric Chemistry and Physics |
| title | Formation and loss of light absorbance by phenolic aqueous SOA by <sup>⚫</sup>OH and an organic triplet excited state |
| title_full | Formation and loss of light absorbance by phenolic aqueous SOA by <sup>⚫</sup>OH and an organic triplet excited state |
| title_fullStr | Formation and loss of light absorbance by phenolic aqueous SOA by <sup>⚫</sup>OH and an organic triplet excited state |
| title_full_unstemmed | Formation and loss of light absorbance by phenolic aqueous SOA by <sup>⚫</sup>OH and an organic triplet excited state |
| title_short | Formation and loss of light absorbance by phenolic aqueous SOA by <sup>⚫</sup>OH and an organic triplet excited state |
| title_sort | formation and loss of light absorbance by phenolic aqueous soa by sup ⚫ sup oh and an organic triplet excited state |
| url | https://acp.copernicus.org/articles/24/4473/2024/acp-24-4473-2024.pdf |
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