Dear Marie Denis,

First of all I would like to thank the two reviewers for their review and you for your reply. I think that if you adjust your manuscript according to the comments of the reviewers it should be suitable for publication. There are a few things I would like to stress though, I completely agree with P.J. Hernes in that relative contributions as in figure 4 are confusing. I do see that similar distributions probably have similar sources, but increases and decreases are problematic and you need some go from relative changes to absolute changes to get a grip on increasing and decreasing contributions from different sources. Although I understand that in previous cases reviewers have indicated not to do this, I would like to ask you to somehow include information on absolute changes between the different scenarios. Reviewer two asked some question on the statistical analysis specifically about how to turn values on the PC axes into relative contribution of sources, it would be good if you could elaborate a bit more on how this might work and possible a reference.

Thanks for you rebuttal and I am looking forward to the revised version,

Marcel

Dear Marie Denis,

Thank you for make the changes to your manuscript, I think it reads quite well. Please check the manuscript for clarity and writing style to avoid possible confusion, in general I think this manuscript can be published.

Best regards,

Marcel