Dear Dr Kornilova,

many thanks for your revised submission to ACP, which satisfactorily addresses the reviewers' comments. I am happy to accept it for publication, subject to the following technical corrections.

The word "occurrence" has been misspelled in the axis titles of Figs. 2 and 3.

In line with the ACP Data Policy (http://www.atmospheric-chemistry-and-physics.net/about/data_policy.html), please include geographic location, sampling times, delta values and mole fractions of the individual measurements as an electronic supplement. Alternatively, the data could be deposited in a suitable online repository, but I am not aware of any repositories for atmospheric VOC isotope measurements and given the relatively small size of the dataset, an electronic supplement would appear to be the most accessible solution.

Kind regards
Jan Kaiser
Editor ACP