Comment on “Isotopic evidence for dominant secondary production of HONO in near-ground wildfire plumes” by Chai et al. (2021)

Chai et al. (2021) recently published measurements of wildfire-derived (WF) oxides of nitrogen (NOx) and nitrous acid (HONO) and their isotopic composition. The method used to sample NO<sp...

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Autor principal:	J. M. Roberts
Formato:	article
Lenguaje:	EN
Publicado:	Copernicus Publications 2021
Materias:	Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/8177f1e182924fa69b4455217e045c01
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spelling	oai:doaj.org-article:8177f1e182924fa69b4455217e045c012021-11-18T12:27:29ZComment on “Isotopic evidence for dominant secondary production of HONO in near-ground wildfire plumes” by Chai et al. (2021)10.5194/acp-21-16793-20211680-73161680-7324https://doaj.org/article/8177f1e182924fa69b4455217e045c012021-11-01T00:00:00Zhttps://acp.copernicus.org/articles/21/16793/2021/acp-21-16793-2021.pdfhttps://doaj.org/toc/1680-7316https://doaj.org/toc/1680-7324<p>Chai et al. (2021) recently published measurements of wildfire-derived (WF) oxides of nitrogen (NO<span class="inline-formula"><sub><i>x</i></sub></span>) and nitrous acid (HONO) and their isotopic composition. The method used to sample NO<span class="inline-formula"><sub><i>x</i></sub></span>, collection in alkaline solution, has a known <span class="inline-formula">1:1</span> interference from another reactive nitrogen compound, acetyl peroxynitrate (PAN). Although PAN is thermally unstable, subsequent reactions with nitrogen dioxide (NO<span class="inline-formula"><sub>2</sub></span>) in effect extend the lifetime of PAN many times longer than the initial decomposition reaction would indicate. This, coupled with the rapid and efficient formation of PAN in WF plumes, means the NO<span class="inline-formula"><sub><i>x</i></sub></span> measurements reported by Chai et al. were severely impacted by PAN. In addition, the model reactions in the original paper included neither the reactions of NO<span class="inline-formula"><sub>2</sub></span> with hydroxyl radical (OH) to form nitric acid nor the efficient reaction of larger organic radicals with nitric oxide to form organic nitrates (RONO<span class="inline-formula"><sub>2</sub></span>).</p>J. M. RobertsCopernicus PublicationsarticlePhysicsQC1-999ChemistryQD1-999ENAtmospheric Chemistry and Physics, Vol 21, Pp 16793-16795 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999 Chemistry QD1-999
spellingShingle	Physics QC1-999 Chemistry QD1-999 J. M. Roberts Comment on “Isotopic evidence for dominant secondary production of HONO in near-ground wildfire plumes” by Chai et al. (2021)
description	<p>Chai et al. (2021) recently published measurements of wildfire-derived (WF) oxides of nitrogen (NO<span class="inline-formula"><sub><i>x</i></sub></span>) and nitrous acid (HONO) and their isotopic composition. The method used to sample NO<span class="inline-formula"><sub><i>x</i></sub></span>, collection in alkaline solution, has a known <span class="inline-formula">1:1</span> interference from another reactive nitrogen compound, acetyl peroxynitrate (PAN). Although PAN is thermally unstable, subsequent reactions with nitrogen dioxide (NO<span class="inline-formula"><sub>2</sub></span>) in effect extend the lifetime of PAN many times longer than the initial decomposition reaction would indicate. This, coupled with the rapid and efficient formation of PAN in WF plumes, means the NO<span class="inline-formula"><sub><i>x</i></sub></span> measurements reported by Chai et al. were severely impacted by PAN. In addition, the model reactions in the original paper included neither the reactions of NO<span class="inline-formula"><sub>2</sub></span> with hydroxyl radical (OH) to form nitric acid nor the efficient reaction of larger organic radicals with nitric oxide to form organic nitrates (RONO<span class="inline-formula"><sub>2</sub></span>).</p>
format	article
author	J. M. Roberts
author_facet	J. M. Roberts
author_sort	J. M. Roberts
title	Comment on “Isotopic evidence for dominant secondary production of HONO in near-ground wildfire plumes” by Chai et al. (2021)
title_short	Comment on “Isotopic evidence for dominant secondary production of HONO in near-ground wildfire plumes” by Chai et al. (2021)
title_full	Comment on “Isotopic evidence for dominant secondary production of HONO in near-ground wildfire plumes” by Chai et al. (2021)
title_fullStr	Comment on “Isotopic evidence for dominant secondary production of HONO in near-ground wildfire plumes” by Chai et al. (2021)
title_full_unstemmed	Comment on “Isotopic evidence for dominant secondary production of HONO in near-ground wildfire plumes” by Chai et al. (2021)
title_sort	comment on “isotopic evidence for dominant secondary production of hono in near-ground wildfire plumes” by chai et al. (2021)
publisher	Copernicus Publications
publishDate	2021
url	https://doaj.org/article/8177f1e182924fa69b4455217e045c01
work_keys_str_mv	AT jmroberts commentonisotopicevidencefordominantsecondaryproductionofhonoinneargroundwildfireplumesbychaietal2021
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Comment on “Isotopic evidence for dominant secondary production of HONO in near-ground wildfire plumes” by Chai et al. (2021)

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