Dear authors,

please consider the additional referee comments and revise your manuscript accordingly.
In particular, I strongly suggest expanding the information on the measurements and data quality and moving it to the main paper rather than having it in a supplement.

Best regards,
Marc

Dear Authors,

thank you for making the requested revisions. I think that they have improved the paper, which I deem almost ready for final publication.

I just ask you to provide (and include in the paper!) some very basic information on the parameters in Equation (2) that will help readers to better understand your experiments and possibly carry out similar experiments with soils from other sites.

The information I ask for is:
- accuracy and 1 Hz precision of the Aerodyne QCL analyzer
(you do reference earlier work on the instrument, but it would be good to have these two numbers in the paper!)
- typical sweep rates V used in your experiments
- with what frequency did you switch between measuring Ci and Cf?

Including this information (which you must have at hand, because without it, cou couldn't have carried out the analysis) should not take longer than an hours work and a small table or short paragraph of text.

Best regards,
Marc von Hobe

Dear authors,

thanks for providing this additonal information on your experiments.
I hereby accept your manuscript in its present form for final publication in ACP.

Best regards,
Marc von Hobe