Articles | Volume 18, issue 8
https://doi.org/10.5194/cp-18-1897-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.Effects of orbital forcing, greenhouse gases and ice sheets on Saharan greening in past and future multi-millennia
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- Final revised paper (published on 22 Aug 2022)
- Preprint (discussion started on 16 Mar 2022)
Interactive discussion
Status: closed
Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor
| : Report abuse
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CC1: 'Comment on cp-2022-26', Zhengyu Liu, 03 Apr 2022
- AC1: 'Reply on CC1', Mateo Duque-Villegas, 10 May 2022
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RC1: ' Review by Chris Brierley (UCL) of cp-2022-26', Chris Brierley, 05 Apr 2022
- AC2: 'Reply on RC1', Mateo Duque-Villegas, 10 May 2022
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RC2: 'Comment on cp-2022-26', Anonymous Referee #2, 18 Apr 2022
- AC3: 'Reply on RC2', Mateo Duque-Villegas, 09 Jun 2022
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RC3: 'Comment on cp-2022-26', Anonymous Referee #3, 25 Apr 2022
- AC4: 'Reply on RC3', Mateo Duque-Villegas, 09 Jun 2022
Peer review completion
AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
ED: Publish subject to minor revisions (review by editor) (09 Jun 2022) by Ran Feng

AR by Mateo Duque-Villegas on behalf of the Authors (01 Jul 2022)
Author's response
Author's tracked changes
Manuscript
ED: Publish as is (17 Jul 2022) by Ran Feng

AR by Mateo Duque-Villegas on behalf of the Authors (19 Jul 2022)
This paper discusses the simulation of the North Africa monsoon and vegetation in the last 190,000 years. In particular, it highlights that an increased GHG lowers the threshold for Africa Humid Period (AHP) in the vegetation coverage. The paper is interesting and should be published. But, the paper would be more interesting to readers if some points can be clarified before publication.
Major questions:
The first question is on the mechanism of this threshold change in the model. Why is the threshold reduced (instead of increased) at a higher CO2? Can some specific sensitivity experiment be performed to show this change of threshold is caused by some vegetation (model) property/threshold, changing at different levels of CO2?
The second question is on the role of vegetation feedback. Does this model has a positive vegetation feedback on precipitation in N. Africa? Or What is the role of vegetation feedback here? It seems to me in Fig.3 that the threshold is present only for vegetation, not for precipitation. If vegetation has a strong positive feedback on precipitation, I would also expect a threshold appearing on precipitation. Related to this, the forcing factor separation shows a big difference between precipitation and vegetation, with orbital forcing dominant on vegetation, but not on precipitation. It may be interesting to perform an experiment with the vegetation fixed to see how the precipitation changes. Even only one section of the simulations over 1-2 AHPs will be interesting.
Minor questions: