Remarks to the Author

The authors present an application of regional frequency analysis to estimate extreme sea level exceedance probabilities along the global coastline from tide gauge data and GTSM-ERA5 hindcast. The paper is well-written and well-structured and addresses the relevant issue of estimating extreme water levels at a global level. The regional frequency analysis is a useful approach when dealing with areas where data from local tide gauges is absent or insufficient, that was previously applied to different regions and with this paper to the entire world. The specific objectives of the study are outlined in the Introduction and properly referred to in the manuscript. The methodology is organized in a fluent way although some passages need to be better explained and justified. The validation with Cyclone Yasi is very specific, there is no explanation of how it was chosen nor is there any discussion of the possibility that it was a specific case. The Discussion requires some revision as the limitations of the methodology were not fully explored. Assumptions and simplifications must be done in a global assessment, especially when dealing with global coarse databases. However, the implications and possible errors introduced in the result need to be addressed and discussed.

In the supplementary PDF file, specific and technical comments are reported.

Comments in Supplement "egusphere-2023-2267-supplement.pdf"