Dear authors,
Scientifically your paper is acceptable for publication in ACP, but technically it has to be improved significantly before it can be accepted. There are still too many simple grammatical errors, many of which are listed below. Please make the respective changes and have the manuscript proofread THOROUGHLY by an experienced co-author. Please confirm explicitly to me in a revised version that this has been done, because this proof-reading is not the task of the editor.

In addition, the Figures 10-13 are not embedded in the manuscript. You refer to an appendix, but there is no official appendix section. An appendix often has a short text that relates the figures to the statements in the main text. If you think that this is not necessary you should refer to specific figures in the appendix. As it is now, you let the reader search which figures belong to which statement in the main paper.

Best regards
Thomas Röckmann

l8: .... DO not influence ...
l11 .... WATER vapour ...
l17,19 and 65: The term "isotope" applies only to atoms, not to molecules. Please use water isotopologue, or water isotopocule or reword to "the stable isotopic composition of water" or similar.
l54: responds
l112: The area ... HAS
l113: specify "then"
l119: Changes ... FORCE ...
l124: Changes ... ARE...
l141/42: spatial distribution ..... IS ...
l143: response MATCHES
caption Fig 3 and 4: .... STATISTICALLY ...
l159: SLOPES .... are
l160 ff: THE SCATTER PLOT for all experiments.... and THE LINEAR REGRESSION HAS A SLOPE OF....
l167: differences ... ARE
Caption Fig 5: Delete "The regression lines for the individual experiments are
shown with colours matching the colours of the markers."
Regression lines are shown as black lines.
l184 cannot
l185 change IN
l187: responsible for THE ...
l208: delete "HERE"
l213: SHOWN
l214/15: changes in ... ARE surface based SIGNALS.
l217: as seen IN
l218: anomalies ... DO not have to be...
l219: it still SUGGESTS that the anomalies ARE ...
l242 cannot
l242: that the changes ... ARE
l247 cannot
250: indicates....
l253: model simulations ... ARE
Caption Fig 8 and 9: ... is SHOWN IN black.
L258: Changes ... ARE
l259: none of the.... DISPLAYS
l260/61: distribution.... IS used
l267: DISPLAYS...
l268 SUGGESTS
271: variations ... CORRELATE...
273: suggest to replace "robustness" by "lack of sensitivity"
276: Processes
279: We note THAT our EXPERIMENT does...
282/83: ... can THUS NOT CREATE a similar ATMOSPHERE-induced
286/87: differences ... ARE related
297: of THE inversion
297-301: Two sentences with almost the same statement, rewrite.
311: changes ... INFLUENCE
The figures in the appendix are not

Dear authors,
your manuscript is now accepted for publication subject to the following technical correction: All the references are still replaced by a question mark in the pdf copy that I see. Please update this in the revised version.
Best regards
Thomas Röckmann