Dear Author,

Thank you for submitting a revised version of your manuscript.

Before your article can be accepted for publication I would like you to consider the following pending issues:
- As stated in the revised manuscript (last lines of p12), the present contribution can only be regarded as a first step in the development of a SIA module in MOCAGE given that nucleation and condensation are not included. These are important limitations which should be brought forward more explicitly in the abstract and in the title, that would for instance become “implementation of the ISORROPIA thermodynamic equilibrium model in the chemistry transport MOCAGE version R2.15.0” (other suggestions welcome).
- As pointed out in your answer to reviewer 2, the finest bin will only become relevant in the model when additional processes are implemented, please explain this rationale when introducing the bins p10.
- The representativeness of biogenic emission was questioned by two reviewers, while the answer provided in the response to reviewer 2 is satisfactory, it would have deserved a specific discussion in the revised paper.
- What is referred to as “HTAP observations” would merit clarification. The distinction between HTAP and EMEP observations is awkward as HTAP is actually part of EMEP. A number of observation networks are listed p17, and they should be acknowledged more explicitly. Last, a more direct link to the observation database should be given than www.htap.org.
- Section 5.3.1 should be renamed as there is no forecast mentioned here.

Thank you for considering these additional points

Best

Augustin Colette

Dear Authors,

The link to EBAS is welcome to reach data of the EMEP monitoring network, but the full link to the database made available by HTAP should also be provided as it appears to include also data from other networks. While HTAP may have posted links to several monitoring databases on their website, the Task Force on Hemispheric Transport of Air Pollution is indeed part of the EMEP Programme and not the other way around (see http://www.unece.org/environmental-policy/conventions/envlrtapwelcome/convention-bodies/emep-steering-body.html). There is no such thing as HTAP stations or HTAP observations so a more careful wording where appropriate in the manuscript is required.

There is also a typo P10L23 ("micrphysical"), and "plenty usefull" could read better as "new set of bins will become relevant when microphysical processes..."

best