Dear Dr. Xianghui Li,

Thank you for your reply to the reviewer's comments. I would recommend you make moderate changes to the manuscript following the reviewers' comments and along the lines of your reply letters. I particularly stress that the uncertainties relating to substrate and error propagation regarding the CO2 reconstructions must improve following the advice of the reviewer and I see that you intend to do so.

I will send your paper back for review.

Sincerely,

Appy Sluijs
Editor

Dear Dr. Xianghui Li,

Your paper has been seen one more time by Referee nr2. He has recommended you make a few more corrections. Pending those changes, which I will review personally, I provisionally accept your paper for publication in Climate of the Past. Thank you for choosing Climate of the Past to publish your work.

Sincerely,

Appy Sluijs
Editor

Dear Dr. Xianghui Li,

Thank you for the revised paper. I just went through your revisions and I think the manuscript is almost ready for publication. Two things still need to be adapted.

First, in your table S4, columns 8 and 9 are headed d12Oc. This should be d18Oc.
Secondly, with Dr. Breecker, I think there needs to be clear what the CO2 errors derive from. Ideally, in addition to Table S4, you provide an indication which assumptions provide the basis for lines 15-18 in (the caption of) Figure 6 of the main paper.

Sincerely,

Appy Sluijs
Editor