Insights into HO<sub><i>x</i></sub> and RO<sub><i>x</i></sub> chemistry in the boreal forest via measurement of peroxyacetic acid, peroxyacetic nitric anhydride (PAN) and hydrogen peroxide
<p>Unlike many oxidised atmospheric trace gases, which have numerous production pathways, peroxyacetic acid (PAA) and PAN are formed almost exclusively in gas-phase reactions involving the hydroperoxy radical (HO<sub>2</sub>), the acetyl peroxy radical (CH<sub>3</sub>...
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Copernicus Publications
2018-09-01
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Series: | Atmospheric Chemistry and Physics |
Online Access: | https://www.atmos-chem-phys.net/18/13457/2018/acp-18-13457-2018.pdf |
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record_format |
Article |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
J. N. Crowley N. Pouvesle G. J. Phillips R. Axinte H. Fischer T. Petäjä A. Nölscher J. Williams K. Hens H. Harder M. Martinez-Harder A. Novelli D. Kubistin B. Bohn J. Lelieveld |
spellingShingle |
J. N. Crowley N. Pouvesle G. J. Phillips R. Axinte H. Fischer T. Petäjä A. Nölscher J. Williams K. Hens H. Harder M. Martinez-Harder A. Novelli D. Kubistin B. Bohn J. Lelieveld Insights into HO<sub><i>x</i></sub> and RO<sub><i>x</i></sub> chemistry in the boreal forest via measurement of peroxyacetic acid, peroxyacetic nitric anhydride (PAN) and hydrogen peroxide Atmospheric Chemistry and Physics |
author_facet |
J. N. Crowley N. Pouvesle G. J. Phillips R. Axinte H. Fischer T. Petäjä A. Nölscher J. Williams K. Hens H. Harder M. Martinez-Harder A. Novelli D. Kubistin B. Bohn J. Lelieveld |
author_sort |
J. N. Crowley |
title |
Insights into HO<sub><i>x</i></sub> and RO<sub><i>x</i></sub> chemistry in the boreal forest via measurement of peroxyacetic acid, peroxyacetic nitric anhydride (PAN) and hydrogen peroxide |
title_short |
Insights into HO<sub><i>x</i></sub> and RO<sub><i>x</i></sub> chemistry in the boreal forest via measurement of peroxyacetic acid, peroxyacetic nitric anhydride (PAN) and hydrogen peroxide |
title_full |
Insights into HO<sub><i>x</i></sub> and RO<sub><i>x</i></sub> chemistry in the boreal forest via measurement of peroxyacetic acid, peroxyacetic nitric anhydride (PAN) and hydrogen peroxide |
title_fullStr |
Insights into HO<sub><i>x</i></sub> and RO<sub><i>x</i></sub> chemistry in the boreal forest via measurement of peroxyacetic acid, peroxyacetic nitric anhydride (PAN) and hydrogen peroxide |
title_full_unstemmed |
Insights into HO<sub><i>x</i></sub> and RO<sub><i>x</i></sub> chemistry in the boreal forest via measurement of peroxyacetic acid, peroxyacetic nitric anhydride (PAN) and hydrogen peroxide |
title_sort |
insights into ho<sub><i>x</i></sub> and ro<sub><i>x</i></sub> chemistry in the boreal forest via measurement of peroxyacetic acid, peroxyacetic nitric anhydride (pan) and hydrogen peroxide |
publisher |
Copernicus Publications |
series |
Atmospheric Chemistry and Physics |
issn |
1680-7316 1680-7324 |
publishDate |
2018-09-01 |
description |
<p>Unlike many oxidised atmospheric trace gases, which have numerous production
pathways, peroxyacetic acid (PAA) and PAN are formed almost exclusively in
gas-phase reactions involving the hydroperoxy radical (HO<sub>2</sub>), the
acetyl peroxy radical (CH<sub>3</sub>C(O)O<sub>2</sub>) and NO<sub>2</sub> and are not
believed to be directly emitted in significant amounts by vegetation. As the
self-reaction of HO<sub>2</sub> is the main photochemical route to hydrogen
peroxide (H<sub>2</sub>O<sub>2</sub>), simultaneous observation of PAA, PAN and
H<sub>2</sub>O<sub>2</sub> can provide insight into the HO<sub>2</sub> budget. We present
an analysis of observations taken during a summertime campaign in a boreal
forest that, in addition to natural conditions, was temporarily impacted by
two biomass-burning plumes. The observations were analysed using an
expression based on a steady-state assumption using relative PAA-to-PAN
mixing ratios to derive HO<sub>2</sub> concentrations. The steady-state approach
generated HO<sub>2</sub> concentrations that were generally in reasonable
agreement with measurements but sometimes overestimated those observed by
factors of 2 or more. We also used a chemically simple, constrained box model
to analyse the formation and reaction of radicals that define the observed
mixing ratios of PAA and H<sub>2</sub>O<sub>2</sub>. After nudging the simulation
towards observations by adding extra, photochemical sources of HO<sub>2</sub>
and CH<sub>3</sub>C(O)O<sub>2</sub>, the box model replicated the observations of
PAA, H<sub>2</sub>O<sub>2</sub>, ROOH and OH throughout the campaign, including the
biomass-burning-influenced episodes during which significantly higher levels
of many oxidized trace gases were observed. A dominant fraction of
CH<sub>3</sub>O<sub>2</sub> radical generation was found to arise via reactions of
the CH<sub>3</sub>C(O)O<sub>2</sub> radical. The model indicates that organic
peroxy radicals were present at night in high concentrations that sometimes
exceeded those predicted for daytime, and initially divergent measured and
modelled HO<sub>2</sub> concentrations and daily concentration profiles are
reconciled when organic peroxy radicals are detected (as HO<sub>2</sub>) at an
efficiency of 35 %. Organic peroxy radicals are found to play an
important role in the recycling of OH radicals subsequent to their loss via
reactions with volatile organic compounds.</p> |
url |
https://www.atmos-chem-phys.net/18/13457/2018/acp-18-13457-2018.pdf |
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doaj-930378d10b2b47c1a724c968d3aa10dc2020-11-24T21:11:21ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242018-09-0118134571347910.5194/acp-18-13457-2018Insights into HO<sub><i>x</i></sub> and RO<sub><i>x</i></sub> chemistry in the boreal forest via measurement of peroxyacetic acid, peroxyacetic nitric anhydride (PAN) and hydrogen peroxideJ. N. Crowley0N. Pouvesle1G. J. Phillips2R. Axinte3H. Fischer4T. Petäjä5A. Nölscher6J. Williams7K. Hens8H. Harder9M. Martinez-Harder10A. Novelli11D. Kubistin12B. Bohn13J. Lelieveld14Division of Atmospheric Chemistry, Max-Planck-Institute für Chemie, Mainz, GermanyDivision of Atmospheric Chemistry, Max-Planck-Institute für Chemie, Mainz, GermanyDivision of Atmospheric Chemistry, Max-Planck-Institute für Chemie, Mainz, GermanyDivision of Atmospheric Chemistry, Max-Planck-Institute für Chemie, Mainz, GermanyDivision of Atmospheric Chemistry, Max-Planck-Institute für Chemie, Mainz, GermanyInstitute for Atmospheric and Earth System Research INAR/Physics, University of Helsinki, Helsinki, FinlandDivision of Atmospheric Chemistry, Max-Planck-Institute für Chemie, Mainz, GermanyDivision of Atmospheric Chemistry, Max-Planck-Institute für Chemie, Mainz, GermanyDivision of Atmospheric Chemistry, Max-Planck-Institute für Chemie, Mainz, GermanyDivision of Atmospheric Chemistry, Max-Planck-Institute für Chemie, Mainz, GermanyDivision of Atmospheric Chemistry, Max-Planck-Institute für Chemie, Mainz, GermanyDivision of Atmospheric Chemistry, Max-Planck-Institute für Chemie, Mainz, GermanyDivision of Atmospheric Chemistry, Max-Planck-Institute für Chemie, Mainz, GermanyInstitut für Energie- und Klimaforschung, Troposphäre (IEK-8), Forschungszentrum Jülich GmbH, 52425 Jülich, GermanyDivision of Atmospheric Chemistry, Max-Planck-Institute für Chemie, Mainz, Germany<p>Unlike many oxidised atmospheric trace gases, which have numerous production pathways, peroxyacetic acid (PAA) and PAN are formed almost exclusively in gas-phase reactions involving the hydroperoxy radical (HO<sub>2</sub>), the acetyl peroxy radical (CH<sub>3</sub>C(O)O<sub>2</sub>) and NO<sub>2</sub> and are not believed to be directly emitted in significant amounts by vegetation. As the self-reaction of HO<sub>2</sub> is the main photochemical route to hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>), simultaneous observation of PAA, PAN and H<sub>2</sub>O<sub>2</sub> can provide insight into the HO<sub>2</sub> budget. We present an analysis of observations taken during a summertime campaign in a boreal forest that, in addition to natural conditions, was temporarily impacted by two biomass-burning plumes. The observations were analysed using an expression based on a steady-state assumption using relative PAA-to-PAN mixing ratios to derive HO<sub>2</sub> concentrations. The steady-state approach generated HO<sub>2</sub> concentrations that were generally in reasonable agreement with measurements but sometimes overestimated those observed by factors of 2 or more. We also used a chemically simple, constrained box model to analyse the formation and reaction of radicals that define the observed mixing ratios of PAA and H<sub>2</sub>O<sub>2</sub>. After nudging the simulation towards observations by adding extra, photochemical sources of HO<sub>2</sub> and CH<sub>3</sub>C(O)O<sub>2</sub>, the box model replicated the observations of PAA, H<sub>2</sub>O<sub>2</sub>, ROOH and OH throughout the campaign, including the biomass-burning-influenced episodes during which significantly higher levels of many oxidized trace gases were observed. A dominant fraction of CH<sub>3</sub>O<sub>2</sub> radical generation was found to arise via reactions of the CH<sub>3</sub>C(O)O<sub>2</sub> radical. The model indicates that organic peroxy radicals were present at night in high concentrations that sometimes exceeded those predicted for daytime, and initially divergent measured and modelled HO<sub>2</sub> concentrations and daily concentration profiles are reconciled when organic peroxy radicals are detected (as HO<sub>2</sub>) at an efficiency of 35 %. Organic peroxy radicals are found to play an important role in the recycling of OH radicals subsequent to their loss via reactions with volatile organic compounds.</p>https://www.atmos-chem-phys.net/18/13457/2018/acp-18-13457-2018.pdf |