Review of Giosan et al.
I have now read the reviewer comments, author responses, and the revised manuscript. The reviewers, especially reviewer #1, have concerns about provenance and the mixing model, and suggested additional analysis. The authors have responded by explaining why additional analysis with Sr isotopes would not be helpful and would not change the conclusions. I find the authors’ explanations reasonable in the response. I am slightly puzzled why they did not include the reasoning presented in the response letter within the manuscript, so in my comments (attached as a pdf) I have highlighted areas where some additional text should be inserted to make clear to readers who have the same concerns as reviewer #1 why Sr or other isotopes were not used. I have also made some editorial suggestions that I think will improve the flow of the paper but the authors are free to take or leave these suggestions as they see fit. My suggestion revision are minor and I look forward to a revised version of the paper.

I thank the authors for their attention to reviewers' and my own comments and now think this contribution is ready for publication in ESURF.

Dear Liviu and colleagues,

Thank you for working with AE Simon Mudd and his referees to optimize your manuscript. I am happy to follow his advice to publish the manuscript in its present form. The paper is a great fit to the ESurf mission and I trust that it will receive good attention.

Your efficient work with Copernicus Publishers in the next phase will expedite the publication of your paper. Please follow their instructions and respond to their prompts without delay.

Thank you for submitting your manuscript to ESurf.

Niels Hovius