Dear Author,

The discussion phase of your manuscript is now over and I encourage you to submit a version revised along the lines of your replies to the referees' comments. Please note the following comments:

- Reply to referee #1: You have not replied to the following question "For example, did all the coupled models follow the protocols outlined in Orr et al. 2017"
- Reply to referee #2: "The uncertainty range was estimated using the 1-σ prediction interval." I suppose you mean 1σ.

Finally, note that Biogeosciences strongly promotes the full availability of the data sets reported in the papers that it publishes in order to facilitate future data comparison and compilation as well as meta-analysis.

Best regards,
Jean-Pierre Gattuso

Dear Author,

Thank you for submitting a revised version of your manuscript submitted to Biogeosciences, which I am glad to provisionally accept for publication provided that you consider the comments below.

I look forward to seeing this paper published and thank you for considering Biogeosciences to publish these very interesting results.

Best regards,
Jean-Pierre Gattuso
BG Editor

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- l2: abstract: "calcium carbonate saturation states of aragonite.." sounds weird. How about "saturation states of aragonite..." or "calcium carbonate saturation states..."
- l4, l10, l12: total alkalinity
- Abstract and in the text: I recommend to replace "Omega_arag/calc", which is used 5 times, by "Omega_arag and Omega_calc" as arag/calc is not defined. Alternatively, it could be defined on the first occurrence. In that case, definition should be in both the abstract and text.
- Fig. 6: red and green color are used. Is this color palette legible by color-blind people?