See attached file.

In this paper, the authors have utilized an impressive array of remote sensing datasets and applied a range of techniques to produce a 50+ year record of surface ice velocity, elevation change, and terminus position change for Abramov glacier. I found this paper very easy to read and follow, with both the data processing and characterization of uncertainty well-explained. The results are well-demonstrated, and provide good support for (almost) all of the conclusions. As such, I have only relatively minor comments on the manuscript that should be easy to address.

• l. 11: "unobserved" pulsation. In the comparison with Mandychev et al. (2017), you show that those authors observed an advance of the glacier, reported as beginning in 2000 (rather than 2002, as you have shown). This seems to be a contradiction with the claim here (and in the conclusions), that this pulsation is "unobserved". The claim that this is better captured by your data/observations than in previous global datasets or other studies is not quite the same thing, so I feel that this claim should be softened somewhat.
• l. 38-39: suggest "... found that data inconsitencies and regional simplifications hinder interpretation ..."
• l. 258: "within bins": what size are the bins used here?
• Fig. 4: would it be possible to include different symbols/patterns to help differentiate the colors here?
• Fig. 5: same comment for panels (c, d) and (g, h) as for Fig. 4
• Appendix E: I think this is worth moving to the main text. Similar to another recent TC paper (Liu et al., 2024), it demonstrates that while global-scale products are phenomenal achievements and resources for the community, there can be some limitations to that can be improved with additional data and/or more bespoke processing.

References

• Liu, J., Gendreau, M., Enderlin, E. M., and Aberle, R.: Improved records of glacier flow instabilities using customized NASA autoRIFT (CautoRIFT) applied to PlanetScope imagery, The Cryosphere, 18, 3571–3590, https://doi.org/10.5194/tc-18-3571-2024, 2024.
• Mandychev, A. N., Usubaliev, R. A., and Azisov, E. A.: Changes of the Abramov Glacier (Alay Ridge) from 1850 to 2014, Ice and Snow,
  
  57, 326–333, https://doi.org/10.15356/2076-6734-2017-3-326-333, 2017.

See the attached file.