Representing Ozone Formation from Volatile Chemical Products (VCP) in Carbon Bond (CB) Chemical Mechanisms
Round 1
Reviewer 1 Report
Comments and Suggestions for AuthorsPlease see the attached file.
Comments for author File: 
Comments.pdf
Author Response
Please see the attachment
Author Response File: Author Response.pdf
Reviewer 2 Report
Comments and Suggestions for AuthorsPlease check the attachment.
Comments for author File: Comments.pdf
Author Response
Please see the attachment
Author Response File: Author Response.pdf
Round 2
Reviewer 2 Report
Comments and Suggestions for AuthorsI believe that this revised manuscript sufficiently addresses my major comments that it can be published in this form. However, the authors may wish to consider the following suggested minor revisions.
I wonder if it might be confusing or misleading to some readers to call the incremental reactivities they calculate in this work and show in Figure 3 and Table 4 "MIR's", since many people think that term refers to the SAPRC MIR's, and conclude that the reactivities calculated in this work are comparable to or an alternative to SAPRC MIRs, and used for the same purposes. In their responses to my comments, the authors stated that the box model reactivities they calculated are not intended to be replacement or alternative MIRs because they think 3D scenarios should be used for this purpose. Instead they state that the purpose of the DDM calculations in this work are intended to serve as a method of showing the effects of changing the CB6 representation. This is appropriate in the context of this work. However, rather then MIR maybe just call it "relative ozone impact", "sensitivities" or just "Ozone reactivity", and point out that this is calculated for a VOC-sensitive scenario similar to that used to derive MIRs.
I suggest revising the first paragraph of Section 2.5 to point out that they are not doing these DDM calculations to calculate MIR values, but to calculate sensitivities to ozone formation for the purpose of evaluating the effects of the changes to CB6 being made in this work.
When discussing mechanisms, they should at least mention the advantages of evaluating mechanisms against chamber data.
Using a different color or symbol for the 18 "poorly represented compounds" in Figure 1 would be helpful in illustrating their relative importance in overall emissions, which is very relevant to this work.
Author Response
We thank the reviewer for making additional helpful suggestions.
We added the following statements to the first paragraph in Section 2.5 "MIR values computed here are not identical to SAPRC MIR values (34) because the box model scenarios employed and chemical mechanisms differ. We computed MIR values for the purpose of evaluating the effects of mechanism updates (Section 3.6)."
We added the following statement to the first paragraph of Section 2.4: "Although we did not explicitly rely upon data from the SAPRC-07 mechanism, we did review SAPRC-07 VCP reaction schemes recognizing that the SAPRC-07 mechanism has been extensively evaluated against chamber experiments."
We revised Figure 1 to use a different color for the 18 "poorly represented compounds" and in so doing found that some points we not displayed in the previous version. We confirmed that all data points are displayed in the revised version.
