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

AR by Dwayne Heard on behalf of the Authors (25 Feb 2021)

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.