Global climate forcing driven by altered BVOC fluxes from 1990 to 2010 land cover change in maritime Southeast Asia

Harper, Kandice L.; Unger, Nadine

doi:https://doi.org/10.5194/acp-18-16931-2018

Articles | Volume 18, issue 23

https://doi.org/10.5194/acp-18-16931-2018

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

https://doi.org/10.5194/acp-18-16931-2018

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

Articles | Volume 18, issue 23

Research article

|

30 Nov 2018

Research article |

| 30 Nov 2018

Global climate forcing driven by altered BVOC fluxes from 1990 to 2010 land cover change in maritime Southeast Asia

Kandice L. Harper and Nadine Unger

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Final revised paper (published on 30 Nov 2018)
Supplement to the final revised paper
Preprint (discussion started on 03 May 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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- Supplement

RC1: 'Review of "Global climate forcing driven by altered BVOC fluxes from 1990-2010 land cover change in maritime Southeast Asia"', Anonymous Referee #1, 12 Jun 2018
- AC1: 'Response to Reviewer 1', Kandice Harper, 26 Aug 2018
RC2: 'Review of "Global climate forcing driven by altered BVOC fluxes from 1990– 2010 land cover change in maritime Southeast Asia" by Harper and Unger', Anonymous Referee #2, 13 Jun 2018
- AC2: 'Response to Reviewer 2', Kandice Harper, 26 Aug 2018
RC3: 'Review for Harper and Unger, ACPD, 2018', Anonymous Referee #3, 25 Jun 2018
- AC3: 'Response to Reviewer 3', Kandice Harper, 26 Aug 2018

Peer-review completion

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

AR by Kandice Harper on behalf of the Authors (26 Aug 2018) Author's response Manuscript

ED: Referee Nomination & Report Request started (07 Sep 2018) by Neil Harris

RR by Anonymous Referee #1 (22 Sep 2018)

Suggestions for revision or reasons for rejection

I thank the authors for their thorough responses to the issues raised in my review of their manuscript. I would however suggest that the tone is unnecessarily aggressive at times. It is beholden on the authors to present their work in a way that is clear, impartial and comprehensible to a wide audience from across the atmospheric sciences community.

I am generally satisfied with the clarifications in their response and with the alterations made to the text. In particular, the authors have addressed the major concerns that I raised.

First, with regard to the chemistry scheme, the authors’ detailed description of the chemical mechanism in ModelE2-YIBs makes it clear that it is fit for purpose and I thank the authors for this addition.

Second, the increased consideration of monoterpene emissions and oxidation products (specifically SOA) has to my mind resulted in a manuscript that is not only more balanced but also more in line with its title.

With regard to model resolution, I stand by my original comments. Just because this is how it has always been done does not mean it is best practice. Clearly I am not saying that previous work at this resolution (going back 20 years) is invalid but as a community I see no reason to rest on our laurels. The reason this is a longstanding query is because it is an on-going point of concern. If we have high-resolution land cover data, emissions and meteorological input data and are considering highly heterogeneous conditions (both spatially and temporally as is the case with short-lived reactive trace gases) exactly what resolution IS sufficient to capture the important processes? While I accept that the ModelE2-YIBs global model may only be suitable for running at the resolution used here, the authors appear to have made no attempt to determine whether increased resolution in the surface layers in the source region affects the magnitude or distribution of the species lofted to the upper troposphere. This issue is one that is being addressed by the atmospheric dynamics community through the development of adaptive grids; perhaps it is time the chemistry community did likewise. While it is a limitation of this study I am satisfied with publication in its present form as the issue is “on the record”.

I would support publication of this work and thank the authors once again for responding so diligently to all of the comments.

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ED: Publish as is (25 Sep 2018) by Neil Harris

AR by Kandice Harper on behalf of the Authors (19 Oct 2018)

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Short summary

Chemistry–climate modeling finds that the induced global-mean ozone forcing for 1990–2010 maritime Southeast Asian land cover change, including expansion of high-isoprene-emitting oil palm plantations, is +9.2 mW m⁻². Regional land cover change drove stronger global-mean ozone enhancements in the upper troposphere than in the lower troposphere. The results indicate that this mechanism of ozone forcing may increase in importance in future years if regional oil palm expansion continues unabated.