Dear authors,

I appreciate your careful response to the reviews. While reading your revised version , I found some minor issues that should be changed prior to uploading the final files (see below; line numbers refer to the revised, marked-up version that was attached to the response to the reviewers).

After that your paper will be accepted for publication in ACP.

Best regards,
Barbara

----------------------------

- l. 194/195: Text: “ These species, along with the aerosols described above, are all averaged in the ``aerosol averaged' simulations”
Comment: ‘Species’ are not averaged but their concentrations. It should be “These species concentrations…”

- l. 263: “NH4-“ should be “NH4+”

- l. 273 – 275: Text: “Sulphuric acid, on the other hand, is hygroscopic, meaning it readily absorbs water at nearly all RH and does not display this step-function behaviour in water absorption.”
Comment: ‘Hygroscopic’ is not defined as being able to take up water at all RH. Also salts that have a distinct DRH are hygroscopic. I suggest shortening the sentence to
“Sulphuric acid, on the other hand, readily absorbs water at nearly all RH and does not display this step-function behaviour in water absorption.”

- l. 284-285: “… and drives the reaction to the aerosol phase”
Comment: This sounds odd. I suggest changing it to “… it drives the equilibrium towards the aerosol phase.”

- l. 450: “expect sulphate” – should be “except sulphate”

l. 527: “…accumulation mode number” should be “…accumulation mode number concentration” (here and at some other places throughout the manuscript)

- l. 577 and l. 582: OH should be named hydroxyl radical or hydroxy radical (or simply ‘OH’), not ‘hydroxide’ as this usually refers to the anion OH-