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. The revised version will go to referee #1 who recommended major revisions and indicated his/her willingness to review the revised version. Please also consider the following comments:

- Fig. 1 of your reply to referee #2 is interesting and should be added either to the manuscript or as supplementary information.
- I remind you my initial comment "It seems to me that the accuracy Ca and CT should be mentioned. Also, even though the initial chemistry is reported, the final chemistry (or the changes during the experiments) are not. Even though this does not prevent publication of your manuscript in Biogeosciences Discussions, these points will be raised by the referees or myself in the review process. You may therefore want to address them now."

Finally, 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. This can be achieved by uploading the data sets in an existing database and providing the link(s) in the paper. Alternatively, the data sets can be published, for free, alongside the paper as supplementary information. The ascii (or text) format is preferred for data and any format can be handled for movies, animations etc...

Best regards,
Jean-Pierre Gattuso

Dear Author,

Thank you for submitting a revised version of your manuscript. Referee #1 is satisfied with the revision and I am too. I am therefore glad to accept this manuscript for publication.

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