Dear Prof. Songtao Ai,

We sincerely appreciate your valuable comments and suggestions. We acknowledge that the duration of GNSS observation, ranging from 15 to 30 minutes, may occasionally be insufficient. In practice, most measurements lasted 30 minutes, with only a small portion being shorter. We will emphasise this point in the revised manuscript. Nonetheless, the observation duration was a compromise between the ambitious and unique objective of systematically monitoring glacier velocity in the Arctic and the practical constraints faced by observers during their survey fieldwork. Field campaigns often had to be interrupted or repeated due to unpredictable weather changes, technical difficulties, or polar bear encounters. These challenges are well-recognised by scientists working in the High Arctic, given the demanding and ever-changing field conditions throughout the year. As a result, the original GNSS files occasionally contain repeated/duplicate measurements, shifts between the antenna and stake, and other erroneous data. These observations were promptly corrected by the observers during the pre-processing procedure upon their return from the glacier to the Polish Polar Station, albeit with limited metadata. To avoid potentially confusing end-users with these corrections, we have decided not to share RINEX files. It's crucial to highlight that we have meticulously reviewed and filtered all observations to eliminate erroneous or dubious data. We are committed to publishing only the accurate observations.

We deeply appreciate the Reviewer's additional suggestions and insightful comments. We intend to incorporate them into the revised version of the manuscript after the open discussion has concluded.

Thank you once again for your valuable input.

Sincerely

On behalf of the authors,

Małgorzata Błaszczyk

Dear Reviewer,

Thank you for providing your valuable comments and suggestions. Firstly, we would like to emphasise the specific focus of the Earth System Science Data (ESSD) journal, as stated on its website: "Earth System Science Data (ESSD) is an international, interdisciplinary journal for the publication of articles on original research data (sets), furthering the reuse of high-quality data of benefit to Earth system sciences. The editors encourage submissions on original data or data collections that are of sufficient quality and have the potential to contribute to these aims. (...) Articles in the data section may pertain to the planning, instrumentation, and execution of experiments or collection of data. Any interpretation of data is outside the scope of regular articles". More information on the primary goal and purpose of ESSD can be found in the editorial by Carlson and Oda (2018).

In line with this emphasis on data description, we have addressed only those issues in the manuscript that were directly related to publishing free and open data with the highest standards. We agree with the Reviewer's point number 5 and will incorporate this aspect into the revised manuscript upon the conclusion of the open discussion phase. We leave the decision regarding the incorporation of comments 1-4 in the revised manuscript to the Editor's discretion.

Regarding the inclusion of other data sets such as GPR, mass balance, geometry, etc., we must respectfully disagree with the Reviewer's request. These data sets have already been published and are freely accessible in their respective domains. Therefore, we can not include them in this data description paper. The mass balance data is annually published in the World Glacier Monitoring Service (WGMS) database (https://wgms.ch/), and the ground-penetrating radar measurements were published in the SESS report and are publicly available (Ignatiuk et al., 2023; https://zenodo.org/records/7371725). Similarly, the bed elevation data (Grabiec, 2012) and digital elevation models (Błaszczyk et al., 2019) have also been published and are deposited in the Polish Polar Database. A 40-year High Arctic climatological dataset of the Polish Polar Station Hornsund has been published in ESSD (Wawrzyniak and Osuch, 2020). Additionally, other studies on Hansbreen facies (Barzycka et al., 2020) and termini fluctuations (Błaszczyk et al., 2021) include freely available data through the Polish Polar Database (http://ppdb.us.edu.pl/geonetwork/srv/eng/catalog.search#/home). Other data are accebiled by the SIOS database: https://sios-svalbard.org/metsis/search?f%5B0%5D=dataset_level%3ALevel-1. 

Given the availability of these comprehensive data sets in their respective domains, we believe it would be redundant to include them in this data description article. However, we will ensure that all relevant citations and links are provided in the revised manuscript, enabling readers to access the complementary information on Hansbreen.

We concur with the Reviewer's suggestion regarding a thorough discussion of the ice velocity record within the context of geophysical surveys, meteorology, and other relevant data. However, as we previously stated, such analysis falls outside the scope of the ESSD journal. We are currently working on a process-based study that will incorporate these considerations, and we will submit it to a journal specifically focused on scientific interpretation and modelling. We will gladly incorporate the Reviewer's insights into this forthcoming study.

Sincerely

On behalf of the authors,

Małgorzata Błaszczyk

Additional references:

Barzycka B., Grabiec M., Błaszczyk M., Ignatiuk D., Laska M., Hagen J.O., and Jania J.: Changes of glacier facies on Hornsund glaciers (Svalbard) during the decade 2007–2017. Remote Sensing of Environment, 251, 112060, 1-22, https://doi.org/10.1016/j.rse.2020.112060, 2020.

Carlson, D. and Oda, T.: Editorial: Data publication – ESSD goals, practices and recommendations, Earth System Science Data, 10, 2275–2278, https://doi.org/10.5194/essd-10-2275-2018, 2018.

Ignatiuk, D., Dunse, T., Gallet, J.-C., Girod, L., Grabiec, M., Kepski, D., Kohler, J., Laska, M., Luks, B., van Pelt, W., Petterson, R., Pohjola, V., and Schuler Thomas V.: Ground penetrating radar measurement of snow in Svalbard - past, present, future (SnowGPR). In SESS report 2022 - The State of Environmental Science in Svalbard - an annual report (pp. 116–141). Svalbard Integrated Arctic Earth Observing System, https://doi.org/10.5281/zenodo.7371725, 2023.