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...
Guardado en:
| Autores principales: | , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
Copernicus Publications
2021
|
| Materias: | |
| Acceso en línea: | https://doaj.org/article/6f0bd171a3334f9cb6d8cf85efa34ee8 |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| id |
oai:doaj.org-article:6f0bd171a3334f9cb6d8cf85efa34ee8 |
|---|---|
| record_format |
dspace |
| spelling |
oai:doaj.org-article:6f0bd171a3334f9cb6d8cf85efa34ee82021-12-01T13:46:15ZMeasurement report: Observation-based formaldehyde production rates and their relation to OH reactivity around the Arabian Peninsula10.5194/acp-21-17373-20211680-73161680-7324https://doaj.org/article/6f0bd171a3334f9cb6d8cf85efa34ee82021-12-01T00:00:00Zhttps://acp.copernicus.org/articles/21/17373/2021/acp-21-17373-2021.pdfhttps://doaj.org/toc/1680-7316https://doaj.org/toc/1680-7324<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>D. DienhartJ. N. CrowleyE. BourtsoukidisA. EdtbauerP. G. EgerL. ErnleH. HarderB. HottmannM. MartinezU. ParchatkaJ.-D. ParisJ.-D. ParisE. Y. PfannerstillR. RohloffJ. SchuladenC. StönnerI. TadicS. TauerN. WangJ. WilliamsJ. WilliamsJ. LelieveldJ. LelieveldH. FischerCopernicus PublicationsarticlePhysicsQC1-999ChemistryQD1-999ENAtmospheric Chemistry and Physics, Vol 21, Pp 17373-17388 (2021) |
| institution |
DOAJ |
| collection |
DOAJ |
| language |
EN |
| topic |
Physics QC1-999 Chemistry QD1-999 |
| spellingShingle |
Physics QC1-999 Chemistry QD1-999 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 |
| 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> |
| format |
article |
| 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 |
| title |
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_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_sort |
measurement report: observation-based formaldehyde production rates and their relation to oh reactivity around the arabian peninsula |
| publisher |
Copernicus Publications |
| publishDate |
2021 |
| url |
https://doaj.org/article/6f0bd171a3334f9cb6d8cf85efa34ee8 |
| work_keys_str_mv |
AT ddienhart measurementreportobservationbasedformaldehydeproductionratesandtheirrelationtoohreactivityaroundthearabianpeninsula AT jncrowley measurementreportobservationbasedformaldehydeproductionratesandtheirrelationtoohreactivityaroundthearabianpeninsula AT ebourtsoukidis measurementreportobservationbasedformaldehydeproductionratesandtheirrelationtoohreactivityaroundthearabianpeninsula AT aedtbauer measurementreportobservationbasedformaldehydeproductionratesandtheirrelationtoohreactivityaroundthearabianpeninsula AT pgeger measurementreportobservationbasedformaldehydeproductionratesandtheirrelationtoohreactivityaroundthearabianpeninsula AT lernle measurementreportobservationbasedformaldehydeproductionratesandtheirrelationtoohreactivityaroundthearabianpeninsula AT hharder measurementreportobservationbasedformaldehydeproductionratesandtheirrelationtoohreactivityaroundthearabianpeninsula AT bhottmann measurementreportobservationbasedformaldehydeproductionratesandtheirrelationtoohreactivityaroundthearabianpeninsula AT mmartinez measurementreportobservationbasedformaldehydeproductionratesandtheirrelationtoohreactivityaroundthearabianpeninsula AT uparchatka measurementreportobservationbasedformaldehydeproductionratesandtheirrelationtoohreactivityaroundthearabianpeninsula AT jdparis measurementreportobservationbasedformaldehydeproductionratesandtheirrelationtoohreactivityaroundthearabianpeninsula AT jdparis measurementreportobservationbasedformaldehydeproductionratesandtheirrelationtoohreactivityaroundthearabianpeninsula AT eypfannerstill measurementreportobservationbasedformaldehydeproductionratesandtheirrelationtoohreactivityaroundthearabianpeninsula AT rrohloff measurementreportobservationbasedformaldehydeproductionratesandtheirrelationtoohreactivityaroundthearabianpeninsula AT jschuladen measurementreportobservationbasedformaldehydeproductionratesandtheirrelationtoohreactivityaroundthearabianpeninsula AT cstonner measurementreportobservationbasedformaldehydeproductionratesandtheirrelationtoohreactivityaroundthearabianpeninsula AT itadic measurementreportobservationbasedformaldehydeproductionratesandtheirrelationtoohreactivityaroundthearabianpeninsula AT stauer measurementreportobservationbasedformaldehydeproductionratesandtheirrelationtoohreactivityaroundthearabianpeninsula AT nwang measurementreportobservationbasedformaldehydeproductionratesandtheirrelationtoohreactivityaroundthearabianpeninsula AT jwilliams measurementreportobservationbasedformaldehydeproductionratesandtheirrelationtoohreactivityaroundthearabianpeninsula AT jwilliams measurementreportobservationbasedformaldehydeproductionratesandtheirrelationtoohreactivityaroundthearabianpeninsula AT jlelieveld measurementreportobservationbasedformaldehydeproductionratesandtheirrelationtoohreactivityaroundthearabianpeninsula AT jlelieveld measurementreportobservationbasedformaldehydeproductionratesandtheirrelationtoohreactivityaroundthearabianpeninsula AT hfischer measurementreportobservationbasedformaldehydeproductionratesandtheirrelationtoohreactivityaroundthearabianpeninsula |
| _version_ |
1718405123358588928 |