Wang, J, Zhang, Y, Zhang, C et al. (18 more authors) (2023) Validating HONO as an Intermediate Tracer of the External Cycling of Reactive Nitrogen in the Background Atmosphere. Environmental Science & Technology, 57 (13). pp. 5474-5484. ISSN 0013-936X
Abstract
In the urban atmosphere, nitrogen oxide (NOx═NO + NO2)-related reactions dominate the formation of nitrous acid (HONO). Here, we validated an external cycling route of HONO and NOx, i.e., formation of HONO resulting from precursors other than NOx, in the background atmosphere. A chemical budget closure experiment of HONO and NOx was conducted at a background site on the Tibetan Plateau and provided direct evidence of the external cycling. An external daytime HONO source of 100 pptv h–1 was determined. Both soil emissions and photolysis of nitrate on ambient surfaces constituted likely candidate mechanisms characterizing this external source. The external source dominated the chemical production of NOx with HONO as an intermediate tracer. The OH production was doubled as a result of the external cycling. A high HONO/NOx ratio (0.31 ± 0.06) during the daytime was deduced as a sufficient condition for the external cycling. Literature review suggested the prevalence of high HONO/NOx ratios in various background environments, e.g., polar regions, pristine mountains, and forests. Our analysis validates the prevalence of external cycling in general background atmosphere and highlights the promotional role of external cycling regarding the atmospheric oxidative capacity.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2023 American Chemical Society. This is an author produced version of an article published in Environmental Science and Technology. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | nitrous acid (HONO); reactive nitrogen; budget analysis; photochemistry; atmospheric oxidative capacity; the Tibetan Plateau |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemistry (Leeds) > Physical Chemistry (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 31 Mar 2023 14:03 |
Last Modified: | 17 Mar 2024 01:13 |
Published Version: | https://doi.org/10.1021/acs.est.2c06731 |
Status: | Published |
Publisher: | American Chemical Society |
Identification Number: | 10.1021/acs.est.2c06731 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:197858 |