Fine particle pH and gas–particle phase partitioning of inorganic species in Pasadena, California, during the 2010 CalNex campaign

Guo, Hongyu; Liu, Jiumeng; Froyd, Karl D.; Roberts, James M.; Veres, Patrick R.; Hayes, Patrick L.; Jimenez, Jose L.; Nenes, Athanasios; Weber, Rodney J.

doi:https://doi.org/10.5194/acp-17-5703-2017

Articles | Volume 17, issue 9

https://doi.org/10.5194/acp-17-5703-2017

© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

https://doi.org/10.5194/acp-17-5703-2017

© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 17, issue 9

Research article

|

08 May 2017

Research article |

| 08 May 2017

Fine particle pH and gas–particle phase partitioning of inorganic species in Pasadena, California, during the 2010 CalNex campaign

Hongyu Guo, Jiumeng Liu, Karl D. Froyd, James M. Roberts, Patrick R. Veres, Patrick L. Hayes, Jose L. Jimenez, Athanasios Nenes, and Rodney J. Weber

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Final revised paper (published on 08 May 2017)
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Interactive discussion

Status: closed

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

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RC1: 'review of Guo et al.', Anonymous Referee #1, 24 Feb 2017
RC2: 'Review of Guo et al', Anonymous Referee #2, 08 Mar 2017
AC1: 'Reply to the reviewers comments', Hongyu Guo, 13 Mar 2017

Peer-review completion

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

AR by Hongyu Guo on behalf of the Authors (22 Mar 2017)

ED: Publish as is (12 Apr 2017) by Astrid Kiendler-Scharr (deceased)

AR by Hongyu Guo on behalf of the Authors (12 Apr 2017)

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Short summary

Fine particle pH is linked to many environmental impacts by affecting particle concentration and composition. Predicted Pasadena, CA (CalNex campaign), PM₁ pH is 1.9 and PM_2.5 pH 2.7, the latter higher due to sea salts. The model predicted gas–particle partitionings of HNO₃–NO₃⁻, NH₃–NH₄⁺, and HCl–Cl⁻ are in good agreement, verifying the model predictions. A summary of contrasting locations in the US and eastern Mediterranean shows fine particles are generally highly acidic, with pH below 3.