Dear authors,

I am pleased to inform you that your paper is accepted for publication in ACP after consideration of the following technical corrections:

I have two comments to your responses to the referee 1 comments:

L75: To my knowledge, SLIMCAT is an abbreviation and I found the following long name in the web: Single Layer Isentropic Model of Chemistry And Transport (https://catalogue.ceda.ac.uk/uuid/ba4dc1a5a1bbdecaeb99bf957db02dc3)

L297-301: The biases in ECMWF are well documented. There are e. g several studies by Manney et al and other authors comparing re-analyses data sets. Currently, there is a paper by McCormack et al. in the ACP discussions. You could also have a look at the recently published S-RIP report for a suitable reference.
Comments on the revised manuscript:

P1, L12 and 13: Add here also the time period for mid-range and long-range (thus “10 days” and “seasonal”, respectively)

P1, L14: Sentence correct? Should it rather read correlation of the NAO index?

P3, L75: see my comment above on the reply.

P5, L124: Here you should a reference. The easiest solution would be to use the review paper by Tritscher et al. (2021) publishedin Reviiw of Geophyiscs earlier this year https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2020RG000702

P5, L126: Also here a reference should be added. Ad hoc I do not have the perfect reference, but check the paper by Wohltmann et al. or Nakajima et al. who had quite often their focus on chlorine activation.

P5, L143: Abbreviation ARPEGE not introduced -> Action de Recherche Petite Echelle Grande Echelle (http://www.umr-cnrm.fr/spip.php?article121&lang=en).

P6, L179: Since you introduced the abbreviation “CD” you could also write here “CD”.

P6, L181: Sentence not clear. Do you mean “ Initialisation with data from …….”

P7, L189: model -> modelled

P8, L217 and L222: write full names of the months

P9, L265: of the hole -> of the ozone hole

P11, L313: Also here a reference is missing. I would suggest to use here again Tritscher et al.

P12, L357, L358 and L367: T -> temperature

P13, L378: either write singular or plural, thus either “this types of ozone linear models are….” Or “this type of ozone model is………”.

P14, L412: three members -> three ensemble members

P15, L453: rephrase to “…..the new ECMWF seasonal system SEAS5…..”

P15, L465: Rephrase sentence as follows: “Byrne and Shepherd found in their
study, using ERA Interim that……..”

P18, 565: sentence not correct. Please correct.

P32, Figure 9 caption: DRMSE in capital letters?

P34, Figure 11 caption: same here and “cover 1-year period” should read “covers a 1-year period”

P41, Figure 18 caption: Darkest reds -> the darkest red colors

Best regards, Farahnaz Khosrawi