Production of HONO from NO2 uptake on illuminated TiO2 aerosol particles and following the illumination of mixed TiO2∕ammonium nitrate particles

Dyson, Joanna E.; Boustead, Graham A.; Fleming, Lauren T.; Blitz, Mark; Stone, Daniel; Arnold, Stephen R.; Whalley, Lisa K.; Heard, Dwayne E.

doi:https://doi.org/10.5194/acp-21-5755-2021

Articles | Volume 21, issue 7

https://doi.org/10.5194/acp-21-5755-2021

© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-21-5755-2021

© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 21, issue 7

Research article

|

16 Apr 2021

Research article |

| 16 Apr 2021

Production of HONO from NO₂ uptake on illuminated TiO₂ aerosol particles and following the illumination of mixed TiO₂∕ammonium nitrate particles

Joanna E. Dyson, Graham A. Boustead, Lauren T. Fleming, Mark Blitz, Daniel Stone, Stephen R. Arnold, Lisa K. Whalley, and Dwayne E. Heard

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Final revised paper (published on 16 Apr 2021)
Preprint (discussion started on 01 Dec 2020)

Interactive discussion

Status: closed

AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

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- Supplement

SC1: 'Short comment', Yuri Bedjanian, 04 Dec 2020
- AC1: 'Reply to Short Comment by Yuri Bedjanian', Dwayne Heard, 04 Dec 2020
RC1: 'Dyson et al', Anonymous Referee #1, 03 Jan 2021
- AC2: 'Response to Referee #1', Dwayne Heard, 11 Feb 2021
RC2: 'Dyson et al', Anonymous Referee #2, 15 Jan 2021
- AC3: 'Response to Referee #2', Dwayne Heard, 11 Feb 2021

Peer-review completion

AR: Author's response | RR: Referee report | ED: Editor decision

AR by Dwayne Heard on behalf of the Authors (13 Feb 2021) Author's response Author's tracked changes Manuscript

ED: Publish as is (23 Feb 2021) by Markus Ammann

Short summary

The hydroxyl radical (OH) dominates the removal of atmospheric pollutants, with nitrous acid (HONO) recognised as a major OH source. For remote regions HONO production through the action of sunlight on aerosol surfaces can provide a source of nitrogen oxides. In this study, HONO production rates at illuminated aerosol surfaces are measured under atmospheric conditions, a model consistent with the data is developed and aerosol production of HONO in the atmosphere is shown to be significant.