Dear author, co-authors,

I have received an additional review of your paper on the footprint analysis of the land cover impacts on the ATTO tower measurements. Overall, the reviewer appreciates the efforts you made on improving the ms by also addressing carefully the comments/feedback that was provided by the same and another reviewer. This reviewer raises though in this second review of the revised version one other point that would be worthwhile to consider in your efforts to identify the specific footprint measured at the ATTO tower. I checked also carefully your ms and the final comment raised by the reviewer and it will be interesting to see if you still take up this last challenge to address the issue of, as the reviewer calls it, the intermittent representativeness issue with an air parcel moving all the way from the East coast to the ATTO site in about 2 days and thus undergoing two cycles of BL mixing over potentially different land cover types. I am looking forward to your response to this last particular issue of the presented study,

Laurens Ganzeveld

Dear author, co-authors, I have checked carefully your response to the last round of suggestions/comments raised by one of the reviewers and also your further revisions to handle these. Overall, it seems now that this review process has resulted in a paper that addresses well the main issues and findings involved in understanding and quantifying what the measurements at the ATTO site might reflect in terms of land cover and land use characteristics and their impact on surface-atmosphere exchange processes upwind of the ATTO tower. It will be interesting to see how further analysis of the observations further confirms the presented footprint analysis. I deem that that the paper is no including all the essentials of such a footprint analysis and accept the paper for publication in ACP. I am sure that the paper will be referenced very frequently in feature for all the papers on the ATTO activities. Finally, I would like to express my gratitude to the two reviewers who have helped to further substantially improve the overall quality of the paper.

Regards, Laurens Ganzeveld