Authors should consider the following points:

P. 1 (pages refer to the revised manuscript)

L. 19-20: Perhaps specify with respect to what you calculate these anomalies. Is it the zonal mean?

P. 2

L. 7: I suggest you use a more objective word than controversial. For example, inconclusive.

L. 18: I am not sure I understand your use of the word “blowing”. Perhaps rephrase or explain. Also, please indicate what you will do in each section of the paper.

L. 27: You have already used CO before, without introducing the acronym. Please address.

L. 32: Perhaps indicate the approximate pressure/height of the 380K level. Perhaps do this elsewhere when you first discuss isentropic levels.

P. 3

L. 1: These would be northern summers. Please specify.

L. 3: Does the unity value have dimensions, or is it dimensionless? See also P. 10, L. 1.

L. 16: These data have…

L. 17: I suggest: “… (2010) and shown to be a valid…”.

L. 27: The full stop should be inside the brackets.

L. 32: Southern Hemisphere. Please use Northern Hemisphere as well (e.g., in Abstract).

P. 4

L. 7: “…these data…”.Data is plural.

L. 10: I suggest you quantify the “good correlation”.

L. 21: cannot

L. 29: I do not understand what you mean by the amount of anticyclone air. You mean air that originated in the anticyclone? Please clarify.

P. 5

L. 15: …indicate regions…

L. 19: Why is this remarkable? Please avoid subjective language.

L. 23: Also what applies? Please be specific.

L. 26: Analogous maps to what?

L. 27: Style point. You use “centred”, UK spelling. However, earlier and later you use fall (US terminology) instead of autumn (UK terminology). I suggest you remain consistent.

L. 34: A clear signal of what?

P. 6

L. 7: The comparison with a chimney is not very clear to me. Maybe provide more details of how this transport is like air moving through a chimney.

P. 7

L. 24: Are these percentages (5% and 15%) from your study, and how representative are they?

Fig. 1 caption: Perhaps indicate that red/grey colours show relatively high/low values. I suggest you consider this for other similar figures.

P. 9

L. 3: Here you have “PV gradient”, whereas elsewhere you have “PV-gradient”. Please be consistent.

L. 13-14: Not clear what you mean here – sentence starting “At days…”. Please clarify.

Fig. 5 caption: You have color (US English) and contour (UK english). Please be consistent with your spelling.

P. 11

L. 3: questionable.