Experimental study of the aerosol impact on fog microphysics

Mazoyer, Marie; Burnet, Frédéric; Denjean, Cyrielle; Roberts, Gregory C.; Haeffelin, Martial; Dupont, Jean-Charles; Elias, Thierry

doi:https://doi.org/10.5194/acp-19-4323-2019

Articles | Volume 19, issue 7

https://doi.org/10.5194/acp-19-4323-2019

© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-19-4323-2019

© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 19, issue 7

Research article

|

04 Apr 2019

Research article |

| 04 Apr 2019

Experimental study of the aerosol impact on fog microphysics

Marie Mazoyer, Frédéric Burnet, Cyrielle Denjean, Gregory C. Roberts, Martial Haeffelin, Jean-Charles Dupont, and Thierry Elias

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Final revised paper (published on 04 Apr 2019)
Preprint (discussion started on 08 Oct 2018)

Interactive discussion

Status: closed

AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

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- Supplement

RC1: 'Referee posting', Anonymous Referee #3, 30 Oct 2018
- AC1: 'Reply to Anonymous Referee #3', Marie Mazoyer, 15 Jan 2019
RC2: 'Review of Mazoyer et al', Anonymous Referee #2, 31 Oct 2018
- AC2: 'Reply to Anonymous Referee #2', Marie Mazoyer, 15 Jan 2019
RC3: 'review', Anonymous Referee #1, 01 Nov 2018
- AC3: 'Reply to Anonymous Referee #1', Marie Mazoyer, 15 Jan 2019
RC4: 'Review Mazoyer et al., 2018', Anonymous Referee #4, 03 Dec 2018
- AC4: 'Reply to Anonymous Referee #4', Marie Mazoyer, 15 Jan 2019

Peer-review completion

AR: Author's response | RR: Referee report | ED: Editor decision

AR by Marie Mazoyer on behalf of the Authors (15 Jan 2019) Author's response Manuscript

ED: Referee Nomination & Report Request started (21 Jan 2019) by Barbara Ervens

RR by Anonymous Referee #3 (01 Feb 2019)

Suggestions for revision or reasons for rejection

-One of the issues bothers me that fog formation and its intensity related to temperature and RH(Sw) are not provided.
Here we know nothing about temperature and they are talking about winter fog. Clearly, Paris T is around 3C daily/monthly but this is in the city.
Over the project site it can easily goes to zero. If this is winter fog why T info not given, and authors insist not to provide it.
-Also, they talk about fog but no Visibility is given, to me this is very weird approach study fog.

-In addition, fog size is usually less than 30 micron, >30 micron becomes drizzle.
No information is provided if there are droplets <30 micron, and what is their size. They should provide Nd and Vis for these cases.

-I see no info on Vis, T, MVD for fog droplets.

-I went over the paper again; specifically Fig. 2 should show some results on Nd-Na relationships (see Gultepe et al Fig. 3 from low level clouds, INTERNATIONAL JOURNAL OF CLIMATOLOGY, VOL. 16, 94 1-946 (1 996))
Some discussion should be provided on this issue.

-Also, Fig. 8 of the submitted paper with same paper above.

Fig 8; I see no relationship between N* and Nact based on K values, it means K doesn’t matter? Or why this result is obtained.

-Intensity of fog is defined based on Vis values, not the fog layer thickness. These fundamental concepts are not emphasized properly.

-Like to see LWC~MVD and LWC~Nd for all fog cases.

-I see still not clear responses for my questions on averaging scale raised before.

-Also, I feel that difference between this paper and previous one submitted a few years ago should be discussed why the current one is an improved version of previous one.

-In addition, some explanation between this manuscript and previous one (submitted a few years ago) should be provided in discussions.

Overall, authors responses were not satisfactory in general, and here we are again have similar issues.

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RR by Anonymous Referee #1 (08 Feb 2019)

ED: Publish subject to minor revisions (review by editor) (11 Feb 2019) by Barbara Ervens

AR by Marie Mazoyer on behalf of the Authors (28 Feb 2019) Author's response Manuscript

ED: Publish as is (04 Mar 2019) by Barbara Ervens

AR by Marie Mazoyer on behalf of the Authors (12 Mar 2019)

Short summary

In situ microphysical measurements collected during 23 fog events at SIRTA (south of Paris) are examined here. An original iterative method based on the κ-Köhler theory has been used to compute statistics of their activation properties. Useful information is provided to constrain and validate numerical simulations. The paper demonstrates that supersaturation encountered in these fogs is too low to observe a correlation between concentrations of aerosols > 200 nm and droplet concentrations.