Particle mass yield from <i>β</i>-caryophyllene ozonolysis
The influence of second-generation products on the particle mass yield of <i>β</i>-caryophyllene ozonolysis was systematically tested and quantified. The approach was to vary the relative concentrations of first- and second-generation products by adjusting the concentration of o...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2012-04-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | http://www.atmos-chem-phys.net/12/3165/2012/acp-12-3165-2012.pdf |
| _version_ | 1811219114231857152 |
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| author | M. Kuwata S. T. Martin K. A. McKinney Q. Chen Y. L. Li |
| author_facet | M. Kuwata S. T. Martin K. A. McKinney Q. Chen Y. L. Li |
| author_sort | M. Kuwata |
| collection | DOAJ |
| description | The influence of second-generation products on the particle mass yield of <i>β</i>-caryophyllene ozonolysis was systematically tested and quantified. The approach was to vary the relative concentrations of first- and second-generation products by adjusting the concentration of ozone while observing changes in particle mass yield. For all wall-loss corrected organic particle mass concentrations <i>M</i><sub>org</sub> of this study (0.5 < <i>M</i><sub>org</sub> < 230 μg m<sup>−3</sup>), the data show that the particle-phase organic material was composed for the most part of second-generation products. For 0.5< <i>M</i><sub>org</sub> < 10 μg m<sup>−3</sup>, a range which overlaps with atmospheric concentrations, the particle mass yield was 10 to 20% and was not sensitive to ozone exposure, implying that the constituent molecules were rapidly produced at all investigated ozone exposures. In contrast, for <i>M</i><sub>org</sub> > 10 μg m<sup>−3</sup> the particle mass yield increased to as high as 70% for the ultimate yield corresponding to the greatest ozone exposures. These differing dependencies on ozone exposure under different regimes of <i>M</i><sub>org</sub> are explained by a combination of the ozonolysis lifetimes of the first-generation products and the volatility distribution of the resulting second-generation products. First-generation products that have short lifetimes produce low-volatility second-generation products whereas first-generation products that have long lifetimes produce high-volatility second-generation products. The ultimate particle mass yield was defined by mass-based stoichiometric yields <i>α</i><sub><i>i</i></sub> of <i>α</i><sub>0</sub> = 0.17 ± 0.05, <i>α</i><sub>1</sub> = 0.11 ± 0.17, and <i>α</i><sub>2</sub> = 1.03 ± 0.30 for corresponding saturation concentrations of 1, 10, and 100 μg m<sup>−3</sup>. Terms <i>α</i><sub>0</sub> and <i>α</i><sub>1</sub> had low sensitivity to the investigated range of ozone exposure whereas term <i>α</i><sub>2</sub> increased from 0.32 ± 0.13 to 1.03 ± 0.30 as the ozone exposure was increased. These findings potentially allow for simplified yet accurate parameterizations in air quality and climate models that seek to represent the ozonolysis particle mass yields of certain classes of biogenic compounds. |
| first_indexed | 2024-04-12T07:19:50Z |
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| id | doaj.art-dd336bc6b19e4b05866c5bf0daf1c17e |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-04-12T07:19:50Z |
| publishDate | 2012-04-01 |
| publisher | Copernicus Publications |
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| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-dd336bc6b19e4b05866c5bf0daf1c17e2022-12-22T03:42:21ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242012-04-011273165317910.5194/acp-12-3165-2012Particle mass yield from <i>β</i>-caryophyllene ozonolysisM. KuwataS. T. MartinK. A. McKinneyQ. ChenY. L. LiThe influence of second-generation products on the particle mass yield of <i>β</i>-caryophyllene ozonolysis was systematically tested and quantified. The approach was to vary the relative concentrations of first- and second-generation products by adjusting the concentration of ozone while observing changes in particle mass yield. For all wall-loss corrected organic particle mass concentrations <i>M</i><sub>org</sub> of this study (0.5 < <i>M</i><sub>org</sub> < 230 μg m<sup>−3</sup>), the data show that the particle-phase organic material was composed for the most part of second-generation products. For 0.5< <i>M</i><sub>org</sub> < 10 μg m<sup>−3</sup>, a range which overlaps with atmospheric concentrations, the particle mass yield was 10 to 20% and was not sensitive to ozone exposure, implying that the constituent molecules were rapidly produced at all investigated ozone exposures. In contrast, for <i>M</i><sub>org</sub> > 10 μg m<sup>−3</sup> the particle mass yield increased to as high as 70% for the ultimate yield corresponding to the greatest ozone exposures. These differing dependencies on ozone exposure under different regimes of <i>M</i><sub>org</sub> are explained by a combination of the ozonolysis lifetimes of the first-generation products and the volatility distribution of the resulting second-generation products. First-generation products that have short lifetimes produce low-volatility second-generation products whereas first-generation products that have long lifetimes produce high-volatility second-generation products. The ultimate particle mass yield was defined by mass-based stoichiometric yields <i>α</i><sub><i>i</i></sub> of <i>α</i><sub>0</sub> = 0.17 ± 0.05, <i>α</i><sub>1</sub> = 0.11 ± 0.17, and <i>α</i><sub>2</sub> = 1.03 ± 0.30 for corresponding saturation concentrations of 1, 10, and 100 μg m<sup>−3</sup>. Terms <i>α</i><sub>0</sub> and <i>α</i><sub>1</sub> had low sensitivity to the investigated range of ozone exposure whereas term <i>α</i><sub>2</sub> increased from 0.32 ± 0.13 to 1.03 ± 0.30 as the ozone exposure was increased. These findings potentially allow for simplified yet accurate parameterizations in air quality and climate models that seek to represent the ozonolysis particle mass yields of certain classes of biogenic compounds.http://www.atmos-chem-phys.net/12/3165/2012/acp-12-3165-2012.pdf |
| spellingShingle | M. Kuwata S. T. Martin K. A. McKinney Q. Chen Y. L. Li Particle mass yield from <i>β</i>-caryophyllene ozonolysis Atmospheric Chemistry and Physics |
| title | Particle mass yield from <i>β</i>-caryophyllene ozonolysis |
| title_full | Particle mass yield from <i>β</i>-caryophyllene ozonolysis |
| title_fullStr | Particle mass yield from <i>β</i>-caryophyllene ozonolysis |
| title_full_unstemmed | Particle mass yield from <i>β</i>-caryophyllene ozonolysis |
| title_short | Particle mass yield from <i>β</i>-caryophyllene ozonolysis |
| title_sort | particle mass yield from i beta i caryophyllene ozonolysis |
| url | http://www.atmos-chem-phys.net/12/3165/2012/acp-12-3165-2012.pdf |
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