Climate responses to anthropogenic emissions of short-lived climate pollutants

Baker, L. H.; Collins, W. J.; Olivié, D. J. L.; Cherian, R.; Hodnebrog, &Oslash;.; Myhre, G.; Quaas, J.

doi:https://doi.org/10.5194/acp-15-8201-2015

Articles | Volume 15, issue 14

https://doi.org/10.5194/acp-15-8201-2015

© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

https://doi.org/10.5194/acp-15-8201-2015

© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 15, issue 14

Research article

|

24 Jul 2015

Research article |

| 24 Jul 2015

Climate responses to anthropogenic emissions of short-lived climate pollutants

L. H. Baker, W. J. Collins, D. J. L. Olivié, R. Cherian, Ø. Hodnebrog, G. Myhre, and J. Quaas

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Final revised paper (published on 24 Jul 2015)
Supplement to the final revised paper
Preprint (discussion started on 10 Feb 2015)
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Interactive discussion

Status: closed

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

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- Supplement

RC C575: 'Review', Anonymous Referee #1, 06 Mar 2015
RC C778: 'Review', Anonymous Referee #2, 14 Mar 2015
AC C2634: 'Author final comment', Laura Baker, 15 May 2015
- AC C2730: 'Author final comment - correct version', Laura Baker, 19 May 2015

Peer-review completion

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

AR by Laura Baker on behalf of the Authors (03 Jun 2015) Author's response

ED: Referee Nomination & Report Request started (06 Jun 2015) by Federico Fierli

RR by Anonymous Referee #2 (21 Jun 2015)

Suggestions for revision or reasons for rejection

The authors have made several changes to the text, and have addressed almost all of the comments that I had in my previous review. There are still a few points were amendments are needed (see below). Following these minor amendments, I believe the manuscript will be ready for publication.

MINOR COMMENTS:

Comment on Page 3829, Lines 11-13: Addition has not been made to the revised text.

Comment on Figure 3: Addition has not been made to the caption in the revised version.

Comment on Page 3835, Lines 25-28: Part of the new text reads “…which is similarly due to aerosol-radiation and aerosol-cloud effects over this region resulting from the aerosol emissions reductions over the eastern USA.” This statement will be more clear if “weaker” is added before “aerosol-radiation”.

Comment on Page 3837, Lines 9-10: Could not find this corrected text in the revised version.

Comment on Page 3838, Lines 15-18: The new text reads: “It is also interesting to note the very similar behaviour of the two NorESM members compared to the quite different responses between the two CAM4 members. In both cases the two members were generated by initializing with a different atmospheric state but keeping everything else the same. This further emphasizes the importance of using more than model, since some models are more sensitive to small perturbations in the initial conditions than others.” Minor amendment needed: “one” needs to be added between “than” and “model”. More important: It is indeed important to have more than one model, and it is useful to keep that statement in the discussion, but the disagreement between just two ensemble members in one model and the better agreement in another model may just mean that those two members happened to feature such behaviour. Nothing can guarantee that a third member would still maintain those features. The sentence should be modified/extended to make this clearer.

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RR by Anonymous Referee #1 (01 Jul 2015)

ED: Publish subject to technical corrections (01 Jul 2015) by Federico Fierli

Dear Authors

I got a positive feedback from the reviewers. So the paper can be published in ACP after addressing the following points to clarify the discussion suggested by one of the reviewers.

Kind regards,

Federico Fierli

MINOR COMMENTS:

Comment on Page 3829, Lines 11-13: Addition has not been made to the revised text.

Comment on Figure 3: Addition has not been made to the caption in the revised version.

Comment on Page 3835, Lines 25-28: Part of the new text reads “…which is similarly due to aerosol-radiation and aerosol-cloud effects over this region resulting from the aerosol emissions reductions over the eastern USA.” This statement will be more clear if “weaker” is added before “aerosol-radiation”.

Comment on Page 3837, Lines 9-10: Could not find this corrected text in the revised version.

Comment on Page 3838, Lines 15-18: The new text reads: “It is also interesting to note the very similar behaviour of the two NorESM members compared to the quite different responses between the two CAM4 members. In both cases the two members were generated by initializing with a different atmospheric state but keeping everything else the same. This further emphasizes the importance of using more than model, since some models are more sensitive to small perturbations in the initial conditions than others.” Minor amendment needed: “one” needs to be added between “than” and “model”. More important: It is indeed important to have more than one model, and it is useful to keep that statement in the discussion, but the disagreement between just two ensemble members in one model and the better agreement in another model may just mean that those two members happened to feature such behaviour. Nothing can guarantee that a third member would still maintain those features. The sentence should be modified/extended to make this clearer.

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AR by Laura Baker on behalf of the Authors (06 Jul 2015) Manuscript

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Short summary

We investigate the impact of removing land-based anthropogenic emissions of three aerosol species, using four fully-coupled atmosphere-ocean global climate models. Removing SO2 emissions leads to warming globally, strongest in the Northern Hemisphere (NH), and an increase in NH precipitation. Organic and black carbon (OC, BC) have a weaker impact, and less certainty on the response; OC (BC) removal shows a weak overall warming (cooling), and both show small increases in precipitation globally.