dear authors,

I have had a quick look at your replies to the reviewer comments.

I would like to ask you in your replies to explain exactly how you changed the manuscript in reaction to the reviewer comments, in particular also by inserting the changed sentences/sections in the manuscript.

please add this and then resubmit your revised manuscript.

best regards, Andreas Engel (co-editor)

dear authors,

most of the concerns raised by the reviewers have been adressed adequately. I would only like the authors to check carefully again the referencing in the section on mean age. E.g. Engel et al., (2009) did not consider an additional transport pathway to the tropical entry (as it is restricted to the middle stratosphere) (see your reference between l. 141 and 148). I am also not convinced that Schoeberl 2005 included multiple modes. I suggest the authors check carefully the references on mean age.

best regards, Andreas Engel (co-editor)