Evaluation of Ozone Formation Potential of Formaldehyde Using Smog Chamber Data
Abstract Formaldehyde (HCHO) is one of the important O3 precursors in the atmospheric environment, but the mechanism for HCHO photochemical reactions is not very clear now. In the present study, the effects of relative humidity (RH) and initial VOC/NOx ratio (RCN) on the HCHO-NOx photochemical react...
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Springer
2023-02-01
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| Series: | Aerosol and Air Quality Research |
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| Online Access: | https://doi.org/10.4209/aaqr.220323 |
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| author | Hailiang Zhang Yongfu Xu Long Jia |
| author_facet | Hailiang Zhang Yongfu Xu Long Jia |
| author_sort | Hailiang Zhang |
| collection | DOAJ |
| description | Abstract Formaldehyde (HCHO) is one of the important O3 precursors in the atmospheric environment, but the mechanism for HCHO photochemical reactions is not very clear now. In the present study, the effects of relative humidity (RH) and initial VOC/NOx ratio (RCN) on the HCHO-NOx photochemical reaction process are studied in terms of smog chamber experiments. The MCM mechanism of formaldehyde is evaluated based on the experimental results. The measured maximum ozone concentration (O3-max) increases first and then decreases with the increase of RCN, and the RCN at the inflection point is 4.0 and 4.8 in the low (RH = 7.8%‒11.5%) and high RH (RH = 71.9%‒84.0%) experiments, respectively. The RH has no obvious effect on the measured O3-max values. The original MCM simulated O3 concentration reaches the maximum value much earlier than the experimental result, but can well simulate the incremental reactivity (IR) values in the experiments. The simulated incremental reactivity of HCHO at 6 h (IR6h) by MCM is influenced by other VOCs, and the simulated maximum IR6h is 1.9 ppb ppb−1, demonstrating that the contribution of HCHO to ozone is comparable to that of acetaldehyde in the atmospheric environment. |
| format | Article |
| id | doaj-art-156d81c2074c48f1a7cef3e0d76b738c |
| institution | Kabale University |
| issn | 1680-8584 2071-1409 |
| language | English |
| publishDate | 2023-02-01 |
| publisher | Springer |
| record_format | Article |
| series | Aerosol and Air Quality Research |
| spelling | doaj-art-156d81c2074c48f1a7cef3e0d76b738c2025-02-09T12:22:47ZengSpringerAerosol and Air Quality Research1680-85842071-14092023-02-0123511710.4209/aaqr.220323Evaluation of Ozone Formation Potential of Formaldehyde Using Smog Chamber DataHailiang Zhang0Yongfu Xu1Long Jia2State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of SciencesState Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of SciencesState Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of SciencesAbstract Formaldehyde (HCHO) is one of the important O3 precursors in the atmospheric environment, but the mechanism for HCHO photochemical reactions is not very clear now. In the present study, the effects of relative humidity (RH) and initial VOC/NOx ratio (RCN) on the HCHO-NOx photochemical reaction process are studied in terms of smog chamber experiments. The MCM mechanism of formaldehyde is evaluated based on the experimental results. The measured maximum ozone concentration (O3-max) increases first and then decreases with the increase of RCN, and the RCN at the inflection point is 4.0 and 4.8 in the low (RH = 7.8%‒11.5%) and high RH (RH = 71.9%‒84.0%) experiments, respectively. The RH has no obvious effect on the measured O3-max values. The original MCM simulated O3 concentration reaches the maximum value much earlier than the experimental result, but can well simulate the incremental reactivity (IR) values in the experiments. The simulated incremental reactivity of HCHO at 6 h (IR6h) by MCM is influenced by other VOCs, and the simulated maximum IR6h is 1.9 ppb ppb−1, demonstrating that the contribution of HCHO to ozone is comparable to that of acetaldehyde in the atmospheric environment.https://doi.org/10.4209/aaqr.220323FormaldehydePhotochemical reactionOzoneMCM |
| spellingShingle | Hailiang Zhang Yongfu Xu Long Jia Evaluation of Ozone Formation Potential of Formaldehyde Using Smog Chamber Data Aerosol and Air Quality Research Formaldehyde Photochemical reaction Ozone MCM |
| title | Evaluation of Ozone Formation Potential of Formaldehyde Using Smog Chamber Data |
| title_full | Evaluation of Ozone Formation Potential of Formaldehyde Using Smog Chamber Data |
| title_fullStr | Evaluation of Ozone Formation Potential of Formaldehyde Using Smog Chamber Data |
| title_full_unstemmed | Evaluation of Ozone Formation Potential of Formaldehyde Using Smog Chamber Data |
| title_short | Evaluation of Ozone Formation Potential of Formaldehyde Using Smog Chamber Data |
| title_sort | evaluation of ozone formation potential of formaldehyde using smog chamber data |
| topic | Formaldehyde Photochemical reaction Ozone MCM |
| url | https://doi.org/10.4209/aaqr.220323 |
| work_keys_str_mv | AT hailiangzhang evaluationofozoneformationpotentialofformaldehydeusingsmogchamberdata AT yongfuxu evaluationofozoneformationpotentialofformaldehydeusingsmogchamberdata AT longjia evaluationofozoneformationpotentialofformaldehydeusingsmogchamberdata |