Dear Authors

I have now examined the two reviews that have been provided for your submission. Based on their recommendations, I request a major revision. Please prepare a new text revised according to my comments below and dealing with all the comments from the referees. Please provide a cover letter that shows clearly how you address each point, and the changes made to the text.

Referee 1 asks for a more detailed validation of the model, noting a lack of uncertainty estimates around the simulations, and minimal comparison to independent data or models. I agree that this is a significant lack in the current ms, so please address this issue in detail. To have confidence in the simulations we need a thorough assessment of model error ('error' is a word I cannot see in the text!). I would be interested to know how uncertainty in the W&H parameters (table 1) is propagated into the simulations. How is uncertainty in ebullition (related to sedge cover, oxidation fraction) dealt with, as these parameters seem highly uncertain? What is the error associated with the assignments of north and south parameters across the high latitudes, particularly outside Siberia where they were developed?

Referee 2 asks for more details on how precipitation and temperature control CH4 response through wetland extent dynamics. Please provide further details to resolve this issue, as it represents a novelty of your approach.

I look forward to seeing your response,

best wishes,

Mathew Williams.

Dear Authors

many thanks for your careful and detailed response to the reviews. I have checked your revisions, and also contacted one of the reviewers, and we are both happy with the revised manuscript. I can now confirm that your paper will be published in Biogeosciences, congratulations.

best wishes

Mathew