Dear Thomas,

Both reviewers are positive about your manuscript. After inspecting reviewers' suggestions and comments and your responses, I have concluded that you should be able to address them by adding clarification and discussing some of the limitations, including:
1) constant organic layer depth, constant soil depth, and deficiency in model capability in capturing the LGM PF extent;
2) clarification on original Fig. 7 and Fig. A12, on the equilibrium response assumption used by the SOM transport/build-up model, and on the model setup.
Finall, one reviewer suggested to rewrite a more focused discussion deriving from your experiments instead general understanding of permafrost.

Thank you! I am looking forward to your revised manuscript!
Ran

1. Please change "mio km2" to x106 (superscript) km2 . CP recommends the use of SI units.
2. Tables have missing bottom borders.