Please see attached file

Hydrographic CTD profiles capturing the onset of near-surface stratification in Southwest Greenland fjords during two consecutive spring 2025 field campaigns

By Marta Umbert et al.

General comment

The dataset presented by the authors is certainly interesting, particularly for a region that has been sampled very little. The main strengths of the paper lie in the methodology used for the monitoring, although some issues need to be clarified.

The data are high resolution, allowing the identification of vertical stratification. The measurements were carried out from a Zodiac boat using a manual winch. The CTD may therefore have been subject to small but significant vertical movements that could affect the purpose of the measurements. The authors should clarify whether and how corrections were applied to account for these movements, particularly with regard to the calculation of salinity.

In the quality control procedure, the authors use gross range checks and fine range checks that appear to be based on methodologies developed for areas different from those examined here. A region-specific adaptation would have been desirable.

Specific comments

Para. 4.3: Could the movements of the small boat, and therefore the vertical movements of the CTD (up and down), introduce spurious data?

Para. 4.6: The gross range check is certainly appropriate for "oceanic" values, but the threshold values are excessive for this area.

Para. 4.6: The regional range check should be complemented by a different check for each fjord, in order to take into account their different characteristics.

Final comment

The paper deserves to be published. The authors should clarify some points regarding the quality control procedures that were applied.