Dear Dr. Portilho-Ramos

Thank you for submitting your manuscript entitled " Understanding the mechanisms behind high glacial productivity in the southern Brazilian margin” [Paper #cp-2018-89] to Climate of the Past. I have now received an assessment of the two reviewers, as well as your response to the reviewers concerns.

In summary I consent with the reviewers suggest moderate revision based on following issues:
I agree with the reviewer regarding the interpretation of the silicic acid leakage hypothesis. The Authors should clarify if changes of the opal burial are associated with opal burial or silicon leakage. Thus, the authors should make a more detailed discussion of the evidence for Atlantic DSi leakage changes on glacial-interglacial timescales.
Secondly, one reviewer requires a more detailed interpretation about processes that effect the foraminifera assemblages that effect the interpretation of the results. In addition I consent with the reviewer that the authors should include a more detailed discussion about the fact that the WOA data include the “global warming” signal.
The feedback provided in the reviewer assessments of your manuscript is important and should be taken into account as you complete your revision. Please include a marked-up manuscript version showing the changes made in your revision. I encourage you to submit a suitably revised version of your manuscript by May, 1, 2019.

Sincerely,
Arne Winguth
Editor