Dear authors:
I have now received two reviewers' comments and also read through your reply to one of the reviewers. I do agree with the reviewers that the major problem with your model is that the ocean ventilation is not included in your model making the entire exercise of limited value. Hence, I do think this needs to be incorporated if the paper should be acceptable for publication. You were indicating in your response that you might be willing to do so. Hence, I encourage you to include these aspects into your model. Along with the revised manuscript, please provide a detailed response in which you state how you dealt with the reviewers' comments in the revised manuscript.
Best wishes, Gerhard Herndl

Dear authors:
I have now received the comments of one reviewer on your revised paper. As you can see, the reviewer is pleased with your efforts to improve the manuscript but still has a few minor remarks which I ask you to incorporate into the final version of the manuscript. Please let me have your revised version of the paper at your earliest convenience.
Best wishes, Gerhard Herndl

Dear authors:
I have read through the revised version of the manuscript as well as to your response to the reviewers' comments. I appreciate to be able to inform you that the revised manuscript is now accepted for publication in Biogeosciences.
Thank you for choosing Biogeosciences as an outlet of your interesting work.
Best wishes, Gerhard Herndl