Dear Suzanne, Cara,

Thank you for your detailed replies to both referee reports. I have now gone through both sets of author replies and the revised version of your manuscript, and feel you have thoroughly and convincingly addressed the suggestions and comments made. Considering also the favourable recommendations by both reviewers, I am therefore pleased to accept your revised version for Biogeosciences.
I would like to make 2 additional suggestions to consider before uploading the final version of your files:
-In the abstract, I feel the conclusions concerning the different water sources (best explored in section 5.3 but relevant not also for DOC concentrations) would be worth including more explicitly, i.e. a key message would be that different water sources contribute to the outflow of the slumps, that these have different DOC concentrations and characteristics (and age), but that the overall decrease in DOC concentrations is not simply a mixing of different sources but that other DOC losses (the proposed mechanism being sorption to particles) also occur.
-I would be strongly in favour (as for all manuscripts) to provide the full data as an electronic supplement. I feel the dataset should be relatively straightforward to organize in a way that is clear to potential users - and that making the full data publicly available will increase their potential value (e.g. use in larger data syntheses).

With best regards
Steven Bouillon

Dear Suzanne, Cara,

Thank you for your final revisions, and I appreciate that you've added the full dataset as a supplement. I'm pleased to accept this version for publication in BG; with a minor technical suggestion outlined below.

Best regards
Steven