This paper describes the observations gathered by the SAFIRE ATR42

research aircraft during the EUREC4A field campaign.  The paper is very

clear, well written, and the figures are well chosen.  I enjoyed reading

it. It provides a very valuable and informative summary of the ATR

aircraft operations and description of the datasets produced.  The

section on the consistency among observations is particularly

interesting and important for the EUREC4A community.

The paper will be a excellent resource for scientists wishing to analyse

SAFIRE ATR42 EUREC4A data now, and for many years to come.

A few relatively minor comments follow which the authors may wish to

consider.

l205 I wondered what the actual description should be. The beginning and

end of these episodes is a bit unclear in reality and also the second

episode of elevated aerosols was over a few days, not just on 11 Feb.

As far as I understand, there were two periods of mineral dust, with the

second period containing significant biomass burning.  I would suggest

30 Jan-6 Feb and 9-12 Feb based on data from Ragged Point (Peter

Gallimore, personal communication), but it could be +/1 day. Perhaps use

the word "about"?

Section 3.1.3. It would be good to consider Lawson and Cooper (1990,

JAOT, 7, p480), particularly with regard to the wetting caused by cloud

drops.

l265. Is it correct that *both* the Rosemount and fine wire

temperature data are processed at 1 Hz and at 25 Hz?

l285. Perhaps "sensors mentioned above"?

l285. Reference at this point for the WVSS-II?

Similarly for the Licor and KH20, and perhaps other instruments

mentioned? Or collectively for a previous project?

l314. g m^(-3)

l321. Add "respectively"?

l415. ...subcloud layer and out of cloud at the cloud base level? Just

to be clear? Likewise, in the next line, ... at the cloud-base level?

l417. Refer back to the last sentence of Section 2.

l430. References for the CDP-2 and 2D-S when they are first mentioned.

l474. It be would be useful to discuss the overlap size range for the two

probes. Was there always good agreement that allowed there to be a

unique distribution to be created?

l486. Semi-colon after Table 8.

l491. To be consistent, perhaps ... underestimate the LWC measurement

when such large drops are present. Drizzle is defined  in the previous

paragraph.

I do wonder, for cloud lwc, how much of an error there will be due to

this incomplete evaporation for such large drops which occur in

relatively low concentrations. Is it larger than the error due to

mis-sizing of large drops?

l497. It might be better to say the concentration of cloud drops is

disproportionally less in a few cases with larger aerosol

concentrations.

There are a few points where that is not true, which might suggest

differences in hygroscopicity as mentioned.

Fig 11 caption. at the cloud base level?

l559. Unambiguous?

l563. I think it's better to start a new sentence for the text in

parenthesis. Similar for l588 and elsewhere.

Figure 17 caption. It is obvious, but it might help some readers to

explain the points and lines in the caption and say how the average was

calculated.

Figure 18 caption. (in orange) should be blue.

Figure 19 caption. It would be good to describe the different lines.

l857. Add "more than" before 500 /cm3? It depends on size.

l894. Add (Figures B1 and B2)?

Similarly for App C.

This paper describes a very valuable data set on cloud and other atmospheric properties acquired during the deployment of the French Safire ATR42 aircraft in the framework of the EUREC4A campaign out of Barbados in early 2020. In the first part the flight strategy is outlined in detail while the second part gives an overview of the measurements and the available data sets. The paper is very well written and the descriptions of the flight strategy and the data set are mostly concise yet sufficiently detailed. For the more extensive parts of the data published elsewhere respective references to more complete discussion are given. The first part laying out the flight strategy and giving the meteorological context of each flight is very helpful for the interpretation and further use of the data. The data is well structured with extensive meta data and accessible in a database. I recommend the paper and data to be published after addressing a few very minor points.

Throughout the paper acronyms should be spelled out at the first use more consistently. In addition, a table of acronyms might be useful to guide the reader. Instrument names could also be listed together with a reference to a published characterization if available.

In some sections the typesetting of mathematical symbols in italics needs to be cleaned up.

P20/l303f: From the wording of the sentence it is not entirely clear if the calibration parameters for the  Licor humidity data were assumed to be constant for all flights or if this was also verified.

P22/l351: The sentence seems incomplete. “..often appear dark because the choice was made…” Do the authors mean the choice of exposure time?

P25/l386: Platform should be spelled in English (maybe give the French name in the parenthesis).

P25: Where the time series of the in-situ data synchronized to the ATR GPS time accounting for potential plumbing delays due to different lengths sample lines?

Sec 3.4: How was the size calibration of the aerosol and could instruments performed? Was the stability of the calibration checked in the field after each flight?

P29/Fig 10.: The authors should consider reporting also (or exclusively?) the median to describe the statistics of the various quantities. Using the mean but an 10-90 percentiles seems inconsistent and given that the distributions are not Gauss-distributed the median is more meaningful.

P44/l784: I am not sure “diagnosed” is the right word here. Maybe “derived” or “deduced”?

l786: see above.

P45/Fig 18, middle panel: Should the lines be drawn in different colors? It might be good to include the cloud-only case also into the legend of the middle panel for clarity.

P48/Fig 19: It is not clear what the different colors indicate. It would be good to add a legend to this plot or use a consistent color scheme for all panels.