Fine Particle PH And Sensitivity To NH 3 And HNO 3 Over Summertime ...

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Preprints https://doi.org/10.5194/acp-2020-501 © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License. https://doi.org/10.5194/acp-2020-501 © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License. Preprints

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21 Jul 2020 | 21 Jul 2020 Status: this preprint was under review for the journal ACP. A final paper is not foreseen. Fine particle pH and sensitivity to NH3 and HNO3 over summertime South Korea during KORUS-AQ Ifayoyinsola Ibikunle, Andreas Beyersdorf, Pedro Campuzano-Jost, Chelsea Corr, John D. Crounse, Jack Dibb, Glenn Diskin, Greg Huey, Jose-Luis Jimenez, Michelle J. Kim, Benjamin A. Nault, Eric Scheuer, Alex Teng, Paul O. Wennberg, Bruce Anderson, James Crawford, Rodney Weber, and Athanasios Nenes

Abstract. Using a new approach that constrains thermodynamic modeling of aerosol composition with measured gas-to-particle partitioning of inorganic nitrate, we estimate the acidity levels for aerosol sampled in the South Korean planetary boundary layer during the NASA/NIER KORUS-AQ field campaign. The pH (mean ± 1σ = 2.43 ± 0.68) and aerosol liquid water content determined were then used to determine the chemical regime of the inorganic fraction of particulate matter (PM) sensitivity to ammonia and nitrate availability. We found that the aerosol formation is always sensitive to HNO3 levels, especially in highly polluted regions, while it is only exclusively sensitive to NH3 in some rural/remote regions. Nitrate levels are further promoted because dry deposition velocity is low and allows its accumulation in the boundary layer. Because of this, HNO3 reductions achieved by NOx controls prove to be the most effective approach for all conditions examined, and that NH3 emissions can only partially affect PM reduction for the specific season and region. Despite the benefits of controlling PM formation to reduce ammonium-nitrate aerosol and PM mass, changes in the acidity domain can significantly affect other processes and sources of aerosol toxicity (such as e.g., solubilization of Fe, Cu and other metals) as well as the deposition patterns of these trace species and reactive nitrate.

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How to cite. Ibikunle, I., Beyersdorf, A., Campuzano-Jost, P., Corr, C., Crounse, J. D., Dibb, J., Diskin, G., Huey, G., Jimenez, J.-L., Kim, M. J., Nault, B. A., Scheuer, E., Teng, A., Wennberg, P. O., Anderson, B., Crawford, J., Weber, R., and Nenes, A.: Fine particle pH and sensitivity to NH3 and HNO3 over summertime South Korea during KORUS-AQ, Atmos. Chem. Phys. Discuss. [preprint], https://doi.org/10.5194/acp-2020-501, 2020. Received: 24 May 2020 – Discussion started: 21 Jul 2020 Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this paper. While Copernicus Publications makes every effort to include appropriate place names, the final responsibility lies with the authors. Views expressed in the text are those of the authors and do not necessarily reflect the views of the publisher. Download & links

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Share Ifayoyinsola Ibikunle, Andreas Beyersdorf, Pedro Campuzano-Jost, Chelsea Corr, John D. Crounse, Jack Dibb, Glenn Diskin, Greg Huey, Jose-Luis Jimenez, Michelle J. Kim, Benjamin A. Nault, Eric Scheuer, Alex Teng, Paul O. Wennberg, Bruce Anderson, James Crawford, Rodney Weber, and Athanasios Nenes

Interactive discussion

Status: closed Status: closed AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment - Printer-friendly version - Supplement

• RC1: 'review for Ibikunle et al.', Anonymous Referee #3, 17 Aug 2020
  • AC4: 'Replies to Reviewer 3 comments.', Athanasios Nenes, 12 Mar 2021
• RC2: 'review comment on app-2020-501', Anonymous Referee #2, 17 Aug 2020
  • AC3: 'Replies to Reviewer 2 comments.', Athanasios Nenes, 12 Mar 2021
• RC3: 'Review comments on Ibikunle et al.', Anonymous Referee #4, 18 Aug 2020
  • AC1: 'Replies to Reviewer 4 comments.', Athanasios Nenes, 11 Mar 2021
• RC4: 'Fine particle pH and sensitivity to NH3 and HNO3 over summertime South Korea during KORUS-AQ', Anonymous Referee #5, 18 Aug 2020
  • AC2: 'Replies to Reviewer 5 comments.', Athanasios Nenes, 12 Mar 2021

Interactive discussion

Status: closed Status: closed AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment - Printer-friendly version - Supplement

• RC1: 'review for Ibikunle et al.', Anonymous Referee #3, 17 Aug 2020
  • AC4: 'Replies to Reviewer 3 comments.', Athanasios Nenes, 12 Mar 2021
• RC2: 'review comment on app-2020-501', Anonymous Referee #2, 17 Aug 2020
  • AC3: 'Replies to Reviewer 2 comments.', Athanasios Nenes, 12 Mar 2021
• RC3: 'Review comments on Ibikunle et al.', Anonymous Referee #4, 18 Aug 2020
  • AC1: 'Replies to Reviewer 4 comments.', Athanasios Nenes, 11 Mar 2021
• RC4: 'Fine particle pH and sensitivity to NH3 and HNO3 over summertime South Korea during KORUS-AQ', Anonymous Referee #5, 18 Aug 2020
  • AC2: 'Replies to Reviewer 5 comments.', Athanasios Nenes, 12 Mar 2021

Ifayoyinsola Ibikunle, Andreas Beyersdorf, Pedro Campuzano-Jost, Chelsea Corr, John D. Crounse, Jack Dibb, Glenn Diskin, Greg Huey, Jose-Luis Jimenez, Michelle J. Kim, Benjamin A. Nault, Eric Scheuer, Alex Teng, Paul O. Wennberg, Bruce Anderson, James Crawford, Rodney Weber, and Athanasios Nenes

Supplement

https://doi.org/10.5194/acp-2020-501-supplement

Ifayoyinsola Ibikunle, Andreas Beyersdorf, Pedro Campuzano-Jost, Chelsea Corr, John D. Crounse, Jack Dibb, Glenn Diskin, Greg Huey, Jose-Luis Jimenez, Michelle J. Kim, Benjamin A. Nault, Eric Scheuer, Alex Teng, Paul O. Wennberg, Bruce Anderson, James Crawford, Rodney Weber, and Athanasios Nenes

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Ifayoyinsola Ibikunle

× School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA

Andreas Beyersdorf

https://orcid.org/0000-0002-4496-2557 × NASA Langley Research Center, Hampton, VA 23681, USA

Pedro Campuzano-Jost

https://orcid.org/0000-0003-3930-010X × Department of Chemistry, University of Colorado, Boulder, CO 80309, USA Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309, USA

Chelsea Corr

× NASA Langley Research Center, Hampton, VA 23681, USA currently at: Colorado State University

John D. Crounse

https://orcid.org/0000-0001-5443-729X × California Institute of Technology, Pasadena, CA 91125

Jack Dibb

× Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, NH 03824, USA

Glenn Diskin

https://orcid.org/0000-0002-3617-0269 × NASA Ames Research Center, Moffett Field, CA 94035, USA

Greg Huey

https://orcid.org/0000-0002-0518-7690 × School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332, USA

Jose-Luis Jimenez

https://orcid.org/0000-0001-6203-1847 × Department of Chemistry, University of Colorado, Boulder, CO 80309, USA Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309, USA

Michelle J. Kim

https://orcid.org/0000-0002-4922-4334 × California Institute of Technology, Pasadena, CA 91125

Benjamin A. Nault

https://orcid.org/0000-0001-9464-4787 × Department of Chemistry, University of Colorado, Boulder, CO 80309, USA Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309, USA

Eric Scheuer

× Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, NH 03824, USA

Alex Teng

× California Institute of Technology, Pasadena, CA 91125

Paul O. Wennberg

https://orcid.org/0000-0002-6126-3854 × California Institute of Technology, Pasadena, CA 91125

Bruce Anderson

× NASA Langley Research Center, Hampton, VA 23681, USA

James Crawford

× NASA Langley Research Center, Hampton, VA 23681, USA

Rodney Weber

https://orcid.org/0000-0003-0765-8035 × School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332, USA

Athanasios Nenes

https://orcid.org/0000-0003-3873-9970 × School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332, USA School of Architecture, Civil & Environmental Engineering, Ecole Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland Center for the Study of Air Quality and Climate Change, Institute for Chemical Engineering Sciences, Foundation for Research and Technology Hellas, Patras, GR-26504, Greece Download

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Short summary Analysis of observations over South Korea during the NASA/NIER KORUS-AQ field campaign show that aerosol is fairly acidic (mean pH 2.43 ± 0.68). Aerosol formation is always sensitive to HNO3 levels, especially in highly polluted regions, while it is only exclusively sensitive to NH3 in some rural/remote regions. Nitrate levels accumulate because dry deposition velocity is low. HNO3 reductions achieved by NOx controls can be the most effective PM reduction strategy for all conditions observed. Analysis of observations over South Korea during the NASA/NIER KORUS-AQ field campaign show... Read more Share Altmetrics