Measurement report: Observation-based formaldehyde production rates and their relation to OH reactivity around the Arabian Peninsula
<p>Formaldehyde (<span class="inline-formula">HCHO</span>) is the most abundant aldehyde in the troposphere. While its background mixing ratio is mostly determined by the oxidation of methane, in many environments, especially in the boundary layer, <span class="in...
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Copernicus Publications
2021-12-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://acp.copernicus.org/articles/21/17373/2021/acp-21-17373-2021.pdf |
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| author | D. Dienhart J. N. Crowley E. Bourtsoukidis A. Edtbauer P. G. Eger L. Ernle H. Harder B. Hottmann M. Martinez U. Parchatka J.-D. Paris J.-D. Paris E. Y. Pfannerstill R. Rohloff J. Schuladen C. Stönner I. Tadic S. Tauer N. Wang J. Williams J. Williams J. Lelieveld J. Lelieveld H. Fischer |
| author_facet | D. Dienhart J. N. Crowley E. Bourtsoukidis A. Edtbauer P. G. Eger L. Ernle H. Harder B. Hottmann M. Martinez U. Parchatka J.-D. Paris J.-D. Paris E. Y. Pfannerstill R. Rohloff J. Schuladen C. Stönner I. Tadic S. Tauer N. Wang J. Williams J. Williams J. Lelieveld J. Lelieveld H. Fischer |
| author_sort | D. Dienhart |
| collection | DOAJ |
| description | <p>Formaldehyde (<span class="inline-formula">HCHO</span>) is the most abundant aldehyde in the troposphere. While its background mixing ratio is mostly determined by the oxidation
of methane, in many environments, especially in the boundary layer, <span class="inline-formula">HCHO</span> can have a large variety of precursors, in particular biogenic and
anthropogenic volatile organic compounds (VOCs) and their oxidation products. Here we present shipborne observations of <span class="inline-formula">HCHO</span>, hydroxyl radical (OH)
and OH reactivity (<span class="inline-formula">R(OH)</span>), which were obtained during the Air Quality and Climate Change in the Arabian Basin (AQABA) campaign in summer 2017. The loss
rate of <span class="inline-formula">HCHO</span> was inferred from its reaction with OH, measured photolysis rates and dry deposition. In photochemical steady state, the <span class="inline-formula">HCHO</span> loss is
balanced by production via OH-initiated degradation of VOCs, photolysis of oxygenated VOCs (<span class="inline-formula">OVOCs</span>) and the ozonolysis of alkenes. The slope
<span class="inline-formula"><i>α</i><sub>eff</sub></span> from a scatter plot of the <span class="inline-formula">HCHO</span> production rate versus the product of OH and <span class="inline-formula">R(OH)<sub>eff</sub></span> (excluding inorganic
contribution) yields the fraction of OH reactivity that contributes to <span class="inline-formula">HCHO</span> production. Values of <span class="inline-formula"><i>α</i><sub>eff</sub></span> varied between less than
2 % in relatively clean air over the Arabian Sea and the southern Red Sea and up to 32 % over the polluted Arabian Gulf (also known as
Persian Gulf), signifying that polluted areas harbor a larger variety of <span class="inline-formula">HCHO</span> precursors. The separation of <span class="inline-formula">R(OH)<sub>eff</sub></span> into individual
compound classes revealed that elevated values of <span class="inline-formula"><i>α</i><sub>eff</sub></span> coincided with increased contribution of alkanes and OVOCs, with the highest
reactivity of all VOCs over the Arabian Gulf.</p> |
| first_indexed | 2024-12-14T14:32:53Z |
| format | Article |
| id | doaj.art-6f0bd171a3334f9cb6d8cf85efa34ee8 |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-12-14T14:32:53Z |
| publishDate | 2021-12-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-6f0bd171a3334f9cb6d8cf85efa34ee82022-12-21T22:57:45ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242021-12-0121173731738810.5194/acp-21-17373-2021Measurement report: Observation-based formaldehyde production rates and their relation to OH reactivity around the Arabian PeninsulaD. Dienhart0J. N. Crowley1E. Bourtsoukidis2A. Edtbauer3P. G. Eger4L. Ernle5H. Harder6B. Hottmann7M. Martinez8U. Parchatka9J.-D. Paris10J.-D. Paris11E. Y. Pfannerstill12R. Rohloff13J. Schuladen14C. Stönner15I. Tadic16S. Tauer17N. Wang18J. Williams19J. Williams20J. Lelieveld21J. Lelieveld22H. Fischer23Department of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, GermanyDepartment of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, GermanyClimate and Atmosphere Research Centre, The Cyprus Institute, Nicosia, CyprusDepartment of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, GermanyDepartment of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, GermanyDepartment of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, GermanyDepartment of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, GermanyDepartment of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, GermanyDepartment of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, GermanyDepartment of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, GermanyClimate and Atmosphere Research Centre, The Cyprus Institute, Nicosia, CyprusLaboratoire des Sciences du Climat et de l'Environnement, CEA-CNRS-UVSQ, UMR8212, IPSL, Gif-sur-Yvette, FranceDepartment of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, GermanyDepartment of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, GermanyDepartment of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, GermanyDepartment of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, GermanyDepartment of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, GermanyDepartment of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, GermanyDepartment of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, GermanyDepartment of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, GermanyClimate and Atmosphere Research Centre, The Cyprus Institute, Nicosia, CyprusDepartment of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, GermanyClimate and Atmosphere Research Centre, The Cyprus Institute, Nicosia, CyprusDepartment of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, Germany<p>Formaldehyde (<span class="inline-formula">HCHO</span>) is the most abundant aldehyde in the troposphere. While its background mixing ratio is mostly determined by the oxidation of methane, in many environments, especially in the boundary layer, <span class="inline-formula">HCHO</span> can have a large variety of precursors, in particular biogenic and anthropogenic volatile organic compounds (VOCs) and their oxidation products. Here we present shipborne observations of <span class="inline-formula">HCHO</span>, hydroxyl radical (OH) and OH reactivity (<span class="inline-formula">R(OH)</span>), which were obtained during the Air Quality and Climate Change in the Arabian Basin (AQABA) campaign in summer 2017. The loss rate of <span class="inline-formula">HCHO</span> was inferred from its reaction with OH, measured photolysis rates and dry deposition. In photochemical steady state, the <span class="inline-formula">HCHO</span> loss is balanced by production via OH-initiated degradation of VOCs, photolysis of oxygenated VOCs (<span class="inline-formula">OVOCs</span>) and the ozonolysis of alkenes. The slope <span class="inline-formula"><i>α</i><sub>eff</sub></span> from a scatter plot of the <span class="inline-formula">HCHO</span> production rate versus the product of OH and <span class="inline-formula">R(OH)<sub>eff</sub></span> (excluding inorganic contribution) yields the fraction of OH reactivity that contributes to <span class="inline-formula">HCHO</span> production. Values of <span class="inline-formula"><i>α</i><sub>eff</sub></span> varied between less than 2 % in relatively clean air over the Arabian Sea and the southern Red Sea and up to 32 % over the polluted Arabian Gulf (also known as Persian Gulf), signifying that polluted areas harbor a larger variety of <span class="inline-formula">HCHO</span> precursors. The separation of <span class="inline-formula">R(OH)<sub>eff</sub></span> into individual compound classes revealed that elevated values of <span class="inline-formula"><i>α</i><sub>eff</sub></span> coincided with increased contribution of alkanes and OVOCs, with the highest reactivity of all VOCs over the Arabian Gulf.</p>https://acp.copernicus.org/articles/21/17373/2021/acp-21-17373-2021.pdf |
| spellingShingle | D. Dienhart J. N. Crowley E. Bourtsoukidis A. Edtbauer P. G. Eger L. Ernle H. Harder B. Hottmann M. Martinez U. Parchatka J.-D. Paris J.-D. Paris E. Y. Pfannerstill R. Rohloff J. Schuladen C. Stönner I. Tadic S. Tauer N. Wang J. Williams J. Williams J. Lelieveld J. Lelieveld H. Fischer Measurement report: Observation-based formaldehyde production rates and their relation to OH reactivity around the Arabian Peninsula Atmospheric Chemistry and Physics |
| title | Measurement report: Observation-based formaldehyde production rates and their relation to OH reactivity around the Arabian Peninsula |
| title_full | Measurement report: Observation-based formaldehyde production rates and their relation to OH reactivity around the Arabian Peninsula |
| title_fullStr | Measurement report: Observation-based formaldehyde production rates and their relation to OH reactivity around the Arabian Peninsula |
| title_full_unstemmed | Measurement report: Observation-based formaldehyde production rates and their relation to OH reactivity around the Arabian Peninsula |
| title_short | Measurement report: Observation-based formaldehyde production rates and their relation to OH reactivity around the Arabian Peninsula |
| title_sort | measurement report observation based formaldehyde production rates and their relation to oh reactivity around the arabian peninsula |
| url | https://acp.copernicus.org/articles/21/17373/2021/acp-21-17373-2021.pdf |
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