Dear Ingrid,
Thank you for your thoughtful and detailed response to the reviewer comments. It would appear that you are willing to address most of their comments and I would welcome a revised version of the manuscript that I would send out for re-review.
Best wishes,
Chris Stokes

Dear Ingrid,

I'm grateful that one of the original referees was able to review the revised manuscript and has undertaken this task so promptly. It is clear that the revised manuscript is a considerable improvement on the original submission and will make an important contribution, but the reviewer has raised a number of issues that I would ask the authors to consider in a new revision.

Dear Ingrid,
Thank you for submitting your revised manuscript and for addressing the reviewer comments very thoroughly. I'm delighted to accept your manuscript subject to your consideration of the following technical corrections.
Best wishes,
Chris Stokes

Technical corrections from the Editor:

Page 1, Line 19: to avoid confusion with GIS software, perhaps consider GrIS, which is used more frequently in the literature.
Page 1, Line 19: related to the previous point – once you’ve defined the acronym, you should use it throughout the rest of the manuscript (“Greenland Ice Sheet” appears elsewhere, e.g. new text on page 3, line 25). The same applies to the NEGIS acronym.
Page 1, Line 11 “is estimated to be”
Page 5, Line 30: perhaps consider clarifying what you mean by a calving “zone”. I’m not familiar with this term. Is it the same as the calving front?
Page 7, line 5: “during temporary stillstands”
Page 7, line 17: “stillstands”
Page 9, line 26: the specific mention of the Maskwa palaeo-ice stream now reads a little awkwardly in the sense that it might imply that it is a rare occurrence and it is only these two ice streams that are not controlled by topography. However, there are numerous ice streams in the Laurentide Ice Sheet and elsewhere (e.g. Fennoscandian Ice Sheet) that were not obviously controlled by topography (e.g. see Margold et al., 2015 and some of the early work by Mikko Punkari referring to ice streams on the Fennoscandian Shield).
Page 10, line 9: “the resulting deglacial dynamics were characterised…”
Page 10, line 14: the last part of this long sentence could be a separate sentence, i.e. “The ice stream in Store…”
Page 10, line 51: “required for the formation”
Page 11, line 9: “evenly spaced recessional moraines as annual features in the…”
Page 11, line 14: “trough, the spacing…”
Page 11, line 45: delete “from here”
Page 11, lines 45-49: consider re-writing/splitting this long sentence which is rather awkward to read.