See attachment.

Review of ‘Simulating the Holocene evolution of Ryder Glacier, North Greenland’

Manuscript Summary

This manuscript presents the results of ISSM simulations of Ryder Glacier, North Greenland, through the Holocene, constrained by preexisting terrestrial reconstructions and marine sediment records. They aim to better understand the drivers of Holocene ice sheet retreat and advance. Their results show that retreat following the Younger Dryas was SMB driven, with ice-ocean interactions becoming more important during the mid-Holocene. They also demonstrate that the Neoglacial advance of Ryder Glacier requires ice tongue regrowth, which required both cooling ocean temperatures and air temperatures.

The manuscript is well-written and structured, effectively addressing the paper's objectives. It is very well illustrated, which helps me (and any reader) to understand what is being presented. The interpretations are clear and well supported by the results presented.

I don’t have many major criticisms or concerns with the paper, but I think some aspects of the writing should be improved. There are numerous typos and incorrect word choices which limit the understanding of the content at times. I’ve included some below, but there are more.

Minor comments:

• The decision behind the choice of model is not very clearly explained. Given the dependence of the paper on this, and as a non-modelling expert, I feel it would be beneficial to explain the choices for this glaciological and topographic situation.
• You discuss the Steensby Stade as the last part of the Holocene glacial history of North Greenland, and also discuss the late Holocene advance, which reached its maximum at the LIA. Are these the same advance – i.e. both culminated in the LIA? I think some clarity should be given about this – including the LIA limit. In Fig 2a you label the two previous Stades, and in Fig. 2b you have the LIA (offshore) limit labelled. Is this LIA actually limit actually recorded, I had a quick look at the Koch (1928) reference and couldn’t see how this limit was recorded. Is there an onshore expression of the LIA too?
• Younger Dryas spin up: you say that you are assuming that the Ryder Glacier was stable during the Younger Dryas. Is there any evidence to back this up? The YD in Greenland is very enigmatic, and there is often little evidence for a stillstand, moraine formation, or dramatic slowdown during it (unless I am mistaken). So I’d slightly caution the statement that the glacier was stable at this point in time.
• L154: 12,500 BP until 2000 CE is 14,500 years, not 12,500.
• P230: Is using the calving threshold for Petermann glacier here valid? Especially as the Petermann simulation was for present day conditions.
• Section 5.3 – the recent work on Nioghalvfjerdsbræ (79N) is partially included here (Smith et al. 2023), but further work has been completed here, in a similar setting (floating ice tongue collapse). Some further discussion of differences or similarities in forcings could be pertinent, as there is both offshore and onshore data.
• L468: This may just be due to strange phrasing, but calving wouldn’t have an impact on the terrestrial ice margin, unless you mean indirect impact in comparison to adjacent marine areas?