Effect of NOx level on secondary organic aerosol (SOA) formation from the photooxidation of terpenes
Secondary organic aerosol (SOA) formation from the photooxidation of one monoterpene (α-pinene) and two sesquiterpenes (longifolene and aromadendrene) is investigated in the Caltech environmental chambers. The effect of NO<sub>x</sub> on SOA formation for these biogenic hydrocarbons is e...
| Main Authors: | , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2007-10-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | http://www.atmos-chem-phys.net/7/5159/2007/acp-7-5159-2007.pdf |
| _version_ | 1828268176013524992 |
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| author | R. C. Flagan N. F. Dalleska S. M. Murphy A. Sorooshian P. O. Wennberg D. C. McCabe A. J. Kwan J. H. Kroll A. W. H. Chan J. D. Surratt N. L. Ng P. S. Chhabra J. H. Seinfeld |
| author_facet | R. C. Flagan N. F. Dalleska S. M. Murphy A. Sorooshian P. O. Wennberg D. C. McCabe A. J. Kwan J. H. Kroll A. W. H. Chan J. D. Surratt N. L. Ng P. S. Chhabra J. H. Seinfeld |
| author_sort | R. C. Flagan |
| collection | DOAJ |
| description | Secondary organic aerosol (SOA) formation from the photooxidation of one monoterpene (α-pinene) and two sesquiterpenes (longifolene and aromadendrene) is investigated in the Caltech environmental chambers. The effect of NO<sub>x</sub> on SOA formation for these biogenic hydrocarbons is evaluated by performing photooxidation experiments under varying NO<sub>x</sub> conditions. The NO<sub>x</sub> dependence of α-pinene SOA formation follows the same trend as that observed previously for a number of SOA precursors, including isoprene, in which SOA yield (defined as the ratio of the mass of organic aerosol formed to the mass of parent hydrocarbon reacted) decreases as NO<sub>x</sub> level increases. The NO<sub>x</sub> dependence of SOA yield for the sesquiterpenes, longifolene and aromadendrene, however, differs from that determined for isoprene and α-pinene; the aerosol yield under high-NO<sub>x</sub> conditions substantially exceeds that under low-NO<sub>x</sub> conditions. The reversal of the NO<sub>x</sub> dependence of SOA formation for the sesquiterpenes is consistent with formation of relatively low-volatility organic nitrates, and/or the isomerization of large alkoxy radicals leading to less volatile products. Analysis of the aerosol chemical composition for longifolene confirms the presence of organic nitrates under high-NO<sub>x</sub> conditions. Consequently the formation of SOA from certain biogenic hydrocarbons such as sesquiterpenes (and possibly large anthropogenic hydrocarbons as well) may be more efficient in polluted air. |
| first_indexed | 2024-04-13T05:15:31Z |
| format | Article |
| id | doaj.art-489f9d2681d94ba997853dda4c695976 |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-04-13T05:15:31Z |
| publishDate | 2007-10-01 |
| publisher | Copernicus Publications |
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| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-489f9d2681d94ba997853dda4c6959762022-12-22T03:00:55ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242007-10-0171951595174Effect of NOx level on secondary organic aerosol (SOA) formation from the photooxidation of terpenesR. C. FlaganN. F. DalleskaS. M. MurphyA. SorooshianP. O. WennbergD. C. McCabeA. J. KwanJ. H. KrollA. W. H. ChanJ. D. SurrattN. L. NgP. S. ChhabraJ. H. SeinfeldSecondary organic aerosol (SOA) formation from the photooxidation of one monoterpene (α-pinene) and two sesquiterpenes (longifolene and aromadendrene) is investigated in the Caltech environmental chambers. The effect of NO<sub>x</sub> on SOA formation for these biogenic hydrocarbons is evaluated by performing photooxidation experiments under varying NO<sub>x</sub> conditions. The NO<sub>x</sub> dependence of α-pinene SOA formation follows the same trend as that observed previously for a number of SOA precursors, including isoprene, in which SOA yield (defined as the ratio of the mass of organic aerosol formed to the mass of parent hydrocarbon reacted) decreases as NO<sub>x</sub> level increases. The NO<sub>x</sub> dependence of SOA yield for the sesquiterpenes, longifolene and aromadendrene, however, differs from that determined for isoprene and α-pinene; the aerosol yield under high-NO<sub>x</sub> conditions substantially exceeds that under low-NO<sub>x</sub> conditions. The reversal of the NO<sub>x</sub> dependence of SOA formation for the sesquiterpenes is consistent with formation of relatively low-volatility organic nitrates, and/or the isomerization of large alkoxy radicals leading to less volatile products. Analysis of the aerosol chemical composition for longifolene confirms the presence of organic nitrates under high-NO<sub>x</sub> conditions. Consequently the formation of SOA from certain biogenic hydrocarbons such as sesquiterpenes (and possibly large anthropogenic hydrocarbons as well) may be more efficient in polluted air.http://www.atmos-chem-phys.net/7/5159/2007/acp-7-5159-2007.pdf |
| spellingShingle | R. C. Flagan N. F. Dalleska S. M. Murphy A. Sorooshian P. O. Wennberg D. C. McCabe A. J. Kwan J. H. Kroll A. W. H. Chan J. D. Surratt N. L. Ng P. S. Chhabra J. H. Seinfeld Effect of NOx level on secondary organic aerosol (SOA) formation from the photooxidation of terpenes Atmospheric Chemistry and Physics |
| title | Effect of NOx level on secondary organic aerosol (SOA) formation from the photooxidation of terpenes |
| title_full | Effect of NOx level on secondary organic aerosol (SOA) formation from the photooxidation of terpenes |
| title_fullStr | Effect of NOx level on secondary organic aerosol (SOA) formation from the photooxidation of terpenes |
| title_full_unstemmed | Effect of NOx level on secondary organic aerosol (SOA) formation from the photooxidation of terpenes |
| title_short | Effect of NOx level on secondary organic aerosol (SOA) formation from the photooxidation of terpenes |
| title_sort | effect of nox level on secondary organic aerosol soa formation from the photooxidation of terpenes |
| url | http://www.atmos-chem-phys.net/7/5159/2007/acp-7-5159-2007.pdf |
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