Dear colleagues

Many thanks for submitting your interesting study to ACP. I am happy to accept the paper for publication subject to a few technical improvements:

- the style of referencing should be consistent. ACP uses e.g. (authors, year; next authors, year). You follow this style in many place but not on p. 4 line 23 and in some other places. Please check.
- "et al." needs a dot, is currently missing on, e.g., p. 4 line 14 and p. 7 line 25.
- please rephrase the new sentence on p. 4 line 16: "East Asia lee of the TB" and "North American downstream" sound strange to me.
- p. 5 line 27: is "15 May" in the bracket for North America correct? It is not consistent with "the entire months of May ..." in line 9.
- p. 7 line 21: please use a consistent notation for times. Here you use just 00 UTC, in other places 00:00 UTC.
- the list of references is more or less in AMS style. Note that ACP uses a rather different style (check in a recent paper). Please adjust the style of the references.

For such an interesting study I find it worth to invest a bit more in the readability of the figures, e.g.:
- Fig. 1 and in some other figures: no units are given for the color bar
- Fig. 1 b,d and many other figures: axis labels and color bar labels are very small (I can hardly read them!)
- Fig. 3: it is really a detail, but your labels "(a) 00 UTC" are very close the panels, which does not look nice. Again all labels are too tiny
- Fig. 5c: line legend: please use a readable font!
- similar with all other figures, in particular Figs. 9 and 14.
- Fig. 10: would it be worth to multiply SR1/SR2 values by 100 to not get so many disturbing zeros?

With best regards,
Heini