Photooxidation of pinonaldehyde at ambient conditions investigated in the atmospheric simulation chamber SAPHIR

Rolletter, Michael; Blocquet, Marion; Kaminski, Martin; Bohn, Birger; Dorn, Hans-Peter; Hofzumahaus, Andreas; Holland, Frank; Li, Xin; Rohrer, Franz; Tillmann, Ralf; Wegener, Robert; Kiendler-Scharr, Astrid; Wahner, Andreas; Fuchs, Hendrik

doi:https://doi.org/10.5194/acp-20-13701-2020

Articles | Volume 20, issue 22

https://doi.org/10.5194/acp-20-13701-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue:

Simulation chambers as tools in atmospheric research (AMT/ACP/GMD...

https://doi.org/10.5194/acp-20-13701-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 20, issue 22

Research article

|

14 Nov 2020

Research article |

| 14 Nov 2020

Photooxidation of pinonaldehyde at ambient conditions investigated in the atmospheric simulation chamber SAPHIR

Michael Rolletter, Marion Blocquet, Martin Kaminski, Birger Bohn, Hans-Peter Dorn, Andreas Hofzumahaus, Frank Holland, Xin Li, Franz Rohrer, Ralf Tillmann, Robert Wegener, Astrid Kiendler-Scharr, Andreas Wahner, and Hendrik Fuchs

Download

Final revised paper (published on 14 Nov 2020)
Supplement to the final revised paper
Preprint (discussion started on 14 Apr 2020)

Interactive discussion

Status: closed

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

- Printer-friendly version

- Supplement

RC1: 'Review of "Photooxidation of pinonaldehyde at ambient conditions investigated in the atmospheric simulation chamber SAPHIR" by Rolletter et al.', Anonymous Referee #1, 02 May 2020
RC2: 'Referee comment', Anonymous Referee #2, 12 May 2020
AC1: 'Answers to the referees', Michael Rolletter, 22 Jul 2020

Peer-review completion

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

AR by Michael Rolletter on behalf of the Authors (22 Jul 2020) Author's response Manuscript

ED: Referee Nomination & Report Request started (11 Aug 2020) by Jean-Francois Doussin

RR by Anonymous Referee #1 (17 Aug 2020)

Suggestions for revision or reasons for rejection

This paper reports results of experiments where pinonaldehyde, a product of atmospheric reactions of biogenic emissions, is photolyzed in a large outdoor environmental chamber in the presence and absence of an OH radical scavenger. The decay of pinonaldehyde, formation of formaldehyde, acetone, and ozone, and levels of OH and HO2 were monitored during the irradiations. It was found that pinonaldehyde photolyzed significantly more rapidly than assumed in MCM and other mechanisms for higher aldehydes. The product and radical levels observed were not consistent with MCM predictions even after the pinonaldehyde photolysis rate was adjusted, and a more complex mechanism proposed by Fantechi et al (2002) (FAN) gave somewhat better predictions in some respects and somewhat worse in others. A number of sensitivity calculations were conducted to evaluate this, but no mechanism was presented that was consistent with all the data.

This is a revised version of a manuscript that I reviewed previously. The significance and scientific quality was rated as excellent, but I did have some comments and suggestions. The revisions sufficiently address my comments, and those of the other reviewer, that I now recommend that it be accepted for publications. I do have one additional suggestion that the authors may consider. In my review I suggested that several possible alternative mechanism options that may affect their observations, and the response was that several new sensitivity calculations were carried out, whose results are given in the Supplement and briefly summarized in the main text. However, not all sensitivity calculations (e.g., "S1_mod", "S1_mod_hv", "2 x KRO2NO, "S3" and "Pathways II-IV") are included in Table 2, the summary of calculations carried out. I suggest that these additional calculations also be listed and summarized in the table. An additional column giving the figure(s) where the results may be seen would also be helpful.

Hide

RR by Anonymous Referee #3 (07 Sep 2020)

ED: Publish as is (24 Sep 2020) by Jean-Francois Doussin

AR by Michael Rolletter on behalf of the Authors (28 Sep 2020) Author's response Manuscript

Download

Article (3004 KB)
Full-text XML

Short summary

The photooxidation of pinonaldehyde is investigated in a chamber study under natural sunlight and low NO conditions with and without an added hydroxyl radical (OH) scavenger. The experimentally determined pinonaldehyde photolysis frequency is faster by a factor of 3.5 than currently used parameterizations in atmospheric models. Yields of degradation products are measured in the presence and absence of OH. Measurements are compared to current atmospheric models and a theory-based mechanism.