Dear authors,

Thank you for submitting your manuscript "Choosing an Optimal β Factor for Relaxed Eddy Accumulation Applications Across Vegetated and non-Vegetated Surfaces" to Biogeosciences. After reviewing the comments made by the referees and your response letters, I find that your manuscript requires major revisions to address the main concerns of the referees. Your overall responses to the referee comments appear very detailed and complete to me. Please incorporate your replies into the revised version of the manuscript. The major changes should include:

- clarification of the innovativeness of the study
- more detailed explanantion of the four REA models
- REA approaches only for H2O fluxes and assumption that results are applicable also to other scalars
- addition of CO2 REA results in the Appendix with short statement in the main paper
- remove outliers from RMSE evaluations
- explanations about kurtosis as stated in the response letters
- please particularly consider the detailed comments of referee 2

Best regards,

Ivonne Trebs

Dear authors,

unfortunately, Referee #1 was not completely satisfied with your revision of the paper. In particular, his minor comments of the first round were obviously not included. Please take these into account and also address his additional major comments.

Best regards

Ivonne Trebs