Dear Rosemary Leone, Joel Harper and colleagues,

Your TCD manuscript "Advection Impacts the Firn Structure of Greenland's Percolation Zone" received two constructive reviews where both reviewers identified issues related to scope, presentation of results and manuscript structure and additionally raised some questions, which you already partly clarified in your author comments.

Now I would like to ask you to upload a revised version of the manuscript together with an author's response where you clearly address the comments of the reviewers. Based on this response and your revised version, I plan to reconsult the reviewers before taking a decision.

Best regards,
Stef Lhermitte, 15 Jan 2020

Dear authors,

First I want to apologise for the delay.

The revised version of your manuscript has again been reviewed by both reviewers who recommend to accept the manuscript subject to minor revisions. Based on these comment I have decided to accept your paper subject to minor revisions (review by editor)

For the revision I advice to check the comments raised by the reviewers and address them in your revised version. More specifically I would advice to certainly address the comments related to the reporting of the sensitivity analysis and the quality of the plots as highlighted by reviewer 2.

Best regards, sorry again for the delay,
Stef Lhermitte

Dear Rosemary Leone, Joel Harper and colleagues,

Thank you for providing the revised version and author's response to the minor revisions of tc-2019-234 "Horizontal Ice Flow Impacts the Firn Structure of Greenland's Percolation Zone". I am happy with your response to most of the minor comments (except for the legend, see below), and recommend to accept the paper. Congratulations!

Nevertheless, I also agree with reviewer 2 that the readability of the figure 2, 3, 5b, S2 & S3 would increase if the color/line legends would be added in the figure itself. Adding all necessary information in the figure will allow the reader to interpret the figure without the need to switch between caption and figure. Therefore, if possible, I ask you to add these legends in the final uploaded version.

Best regards, thanks again for submitting to the Cryosphere,
Stef Lhermitte