Dear Luc Vandenbulcke and Alexander Barth,

I have received two reviews for your revised manuscript "Upscaling of regional models into basin-wide models".

While reviewer 1 recommends the manuscript to be published as is, reviewer 2 asks substantial revisions of the manuscript.

I encourage you to revise your manuscript to take into account suggestions and corrections from reviewer 2 to better address his/her concerns. This includes, but is not limited to, the introduction and discussion of added material (Table 1, Appendix) in the main text of the revised manuscript, and using a terminology that is more aligned with the one used in CMEMS (e.g. regarding regional models).

Best,

Angélique Melet

I recommend the paper for publication after some technical corrections:
Title: I recommend small changes in the title to be more generic. For upscaling, the local, high-resolution model is not necessarily nested (1-way or 2-way) into the larger scale model. The larger scale model does not have to be basin-wide either.
I would therefore recommend to update the title, and the text accordingly.