Dear author, co-authors,

I have received the review of one of the reviewers that I invited to check your revised manuscript. This reviewer appreciates the substantial improvements that have been introduced in manuscript but still recommends to overcome the evaluation "bias" by not only conducting a comparison for mainly the European sites but also to include an evaluation using the US network data (check this site; www.epa.gov/castnet/). I am aware that this implies some extra work on this paper but think that this additional evaluation would really strengthen you analysis. I hope that you indeed take up this challenge and look forward to receive in due time your response and further revised version,

Laurens Ganzeveld

Dear author, co-authors,

I have read the last version of the manuscript and your response to my last round of editors comments. It seems that the multiple iterations being made, to include initially the reviewers comments and also in the last rounds, the editors comments, has now resulted in a paper that I accept for publication in ACP. It will be interesting to see how this challenging evaluation of global scale model simulations of O3 by comparison with local scale observations will be further appreciated by the chemistry-climate modelling and experimental community. Below you can find only three last small comments that came up going through the last version. I am sure that these (comments #1 and 2) will be tackled in producing the actual version for publication in ACP.

Laurens Ganzeveld

Page 4: “land cover classes, including oceans, tropical forests and deserts”. Since you include here the oceans change to “surface cover classes....”

Page 11, “..dominant vegetation types at a 1° scale in the latter data set”

Page 14: “In contrast, the differences in seasonal amplitude in total O3 dry deposition for oceans, grass land and deciduous forest are likely due to the large areas covered by these LCCs as the differences in seasonal amplitude in O3 dry deposition velocities for these LCCs is small.”. Now having this version of the manuscript that reads smoothly and which allowed me to also go over some of the more detailed information, I was struck by this finding. You would expect that actually have large seasonal cycles in the dry deposition velocities of deciduous forest with the changes in LAI over the season. This is quite a surprising result unless the deposition to this class would also include tropical rainforest.