Impacts of biogenic and anthropogenic emissions on summertime ozone formation in the Guanzhong Basin, China

Li, Nan; He, Qingyang; Greenberg, Jim; Guenther, Alex; Li, Jingyi; Cao, Junji; Wang, Jun; Liao, Hong; Wang, Qiyuan; Zhang, Qiang

doi:https://doi.org/10.5194/acp-18-7489-2018

Articles | Volume 18, issue 10

https://doi.org/10.5194/acp-18-7489-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-18-7489-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 18, issue 10

Research article

|

30 May 2018

Research article |

| 30 May 2018

Impacts of biogenic and anthropogenic emissions on summertime ozone formation in the Guanzhong Basin, China

Nan Li, Qingyang He, Jim Greenberg, Alex Guenther, Jingyi Li, Junji Cao, Jun Wang, Hong Liao, Qiyuan Wang, and Qiang Zhang

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Final revised paper (published on 30 May 2018)
Supplement to the final revised paper
Preprint (discussion started on 02 Jan 2018)
Supplement to the preprint

Interactive discussion

Status: closed

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

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RC1: 'review', Anonymous Referee #1, 07 Feb 2018
RC2: 'Review of "Impacts of Biogenic Emissions on Summertime Ozone Formation in the Guanzhong Basin, China"', Anonymous Referee #2, 20 Feb 2018
AC1: 'response to reviewers', Nan Li, 10 Mar 2018

Peer-review completion

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

AR by Nan Li on behalf of the Authors (10 Mar 2018) Author's response Manuscript

ED: Publish subject to minor revisions (review by editor) (16 Apr 2018) by Yugo Kanaya

Based on discussion with the two reviewers, I find further revisions are necessary on the following points:

1. The reviewer #1 requested discussion on how the uncertainty in emission inventories propagates into derived contributions. Although the uncertainties are added to Table in supplementary, no discussion is made. Key issues would be how NOx and anthropogenic VOC concentrations are reproduced by the model simulations. I assume anthropogenic VOC concentrations are measurable from samples for isoprene and monoterpenes. If not, alternative way of evaluation should be proposed.

2. Similarly, discussion on the potential impact from the isoprene chemical mechanism is still weak. The reviewer #1 requested justification why the new isoprene chemistry mechanism does not impact the results. However such justification is not present, although impact in other studies is cited. The authors mentioned "the impacts of biogenic VOCs on O3 formation may vary in different regions and different seasons." The impact of new isoprene chemistry mechanism could be different too, and therefore case study for Guanzhong Basin is necessary.

3. The authors mentioned that sampling was conducted between 9:30-16:30 LT. Were the sampling CONTINUED for 7 hours? Or the short-time samplings were done during the period? Clarification is necessary.

4. Point 3 of reviewer #2. I also feel impact of aerosols (that the authors claim) on J(NO2), 40-60%, is a bit too large.
TUV calculations (http://cprm.acom.ucar.edu/Models/TUV/Interactive_TUV/) to yield 40% lower J(NO2) require AOD=1 and single scattering albedo (SSA) =0.8, or AOD=2 and SSA=0.93. The authors should raise AOD (in addition to PM) and expected SSA during the studied period, to justify that large impact.

5. Section 4.1. Is the unit for VOCs ppb or ppbC? What are the dominant VOCs for 50 or 30 ppb that the authors discussed?

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AR by Nan Li on behalf of the Authors (25 Apr 2018) Author's response Manuscript

ED: Publish subject to minor revisions (review by editor) (27 Apr 2018) by Yugo Kanaya

AR by Nan Li on behalf of the Authors (06 May 2018) Author's response Manuscript

ED: Publish as is (11 May 2018) by Yugo Kanaya

AR by Nan Li on behalf of the Authors (11 May 2018)

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Short summary

O₃ pollution has been increasing in most Chinese cities in recent years. Our study reveals that the synergistic impact of individual source contributions to O₃ formation should be considered in the formation of air pollution control strategies, especially for big cities in the vicinity of forests.