Articles | Volume 25, issue 22
https://doi.org/10.5194/acp-25-16945-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-25-16945-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
27 Nov 2025
Research article |
| 27 Nov 2025
| 27 Nov 2025
A nitrate photolysis source of tropospheric HONO is incompatible with current understanding of atmospheric chemistry
Matthew J. Rowlinson
CORRESPONDING AUTHOR
Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, YO10 5DD, UK
National Centre for Atmospheric Science, University of York, York, YO10 5DD, UK
Lucy J. Carpenter
Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, YO10 5DD, UK
Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, YO10 5DD, UK
James D. Lee
Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, YO10 5DD, UK
National Centre for Atmospheric Science, University of York, York, YO10 5DD, UK
Simone T. Andersen
Atmospheric Chemistry Department, Max Planck Institute for Chemistry, 55128 Mainz, Germany
Tomas Sherwen
Hephaestus Partners, Ealing, London, UK, W7
Anna B. Callaghan
Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, YO10 5DD, UK
Roberto Sommariva
School of Geography Earth and Environmental Sciences, University of Birmingham, Birmingham, B15 2TT, UK
William Bloss
School of Geography Earth and Environmental Sciences, University of Birmingham, Birmingham, B15 2TT, UK
School of Geography Earth and Environmental Sciences, University of Birmingham, Birmingham, B15 2TT, UK
Leigh R. Crilley
Atmospheric Services, WSP Australia, Brisbane, Australia
Klaus Pfeilsticker
Institute of Environmental Physics, University of Heidelberg, Heidelberg, Germany
Benjamin Weyland
Institute of Environmental Physics, University of Heidelberg, Heidelberg, Germany
Thomas B. Ryerson
National Oceanic and Atmospheric Administration (NOAA), Chemical Sciences Laboratory (CSL), Boulder, CO, USA
Patrick R. Veres
Chemical Sciences Division, Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO, USA
now at: National Science Foundation National Center for Atmospheric Research, Boulder, Colorado, USA
Pedro Campuzano-Jost
Cooperative Institute for Research in Environmental Sciences and Department of Chemistry, University of Colorado Boulder, Boulder, CO, USA
Hongyu Guo
Department of Environmental Health and Engineering, Johns Hopkins University, Baltimore, MD, USA
Benjamin A. Nault
Center for Aerosol and Cloud Chemistry, Aerodyne Research Inc., Billerica, MA, USA
Department of Environmental Health and Engineering, Johns Hopkins University, Baltimore, MD, USA
Jose L. Jimenez
NASA Langley Research Center, Hampton, VA, USA
Cooperative Institute for Research in Environmental Sciences and Department of Chemistry, University of Colorado Boulder, Boulder, CO, USA
Khanneh Wadinga Fomba
TROPOS – Leibniz-Institute for Tropospheric Research, Permoserstr. 15, 04318 Leipzig, Germany
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Cumulative views and downloads
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Short summary
HONO is key to tropospheric chemistry. Observations show high HONO concentrations in remote air, possibly explained by nitrate aerosol photolysis. We use observations to parameterize nitrate photolysis, evaluating simulated HONO against observations from multiple sources. We show improved agreement with observed HONO, but overestimates in NOx and O3, beyond observational constraints. This implies uncertainties in the NOx budget and our understanding of atmospheric chemistry.
HONO is key to tropospheric chemistry. Observations show high HONO concentrations in remote air,...
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