Long-range transport of stratospheric aerosols in the Southern Hemisphere following the 2015 Calbuco eruption

Bègue, Nelson; Vignelles, Damien; Berthet, Gwenaël; Portafaix, Thierry; Payen, Guillaume; Jégou, Fabrice; Benchérif, Hassan; Jumelet, Julien; Vernier, Jean-Paul; Lurton, Thibaut; Renard, Jean-Baptiste; Clarisse, Lieven; Duverger, Vincent; Posny, Françoise; Metzger, Jean-Marc; Godin-Beekmann, Sophie

doi:https://doi.org/10.5194/acp-17-15019-2017

Articles | Volume 17, issue 24

https://doi.org/10.5194/acp-17-15019-2017

© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-17-15019-2017

© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 17, issue 24

Research article

|

19 Dec 2017

Research article |

| 19 Dec 2017

Long-range transport of stratospheric aerosols in the Southern Hemisphere following the 2015 Calbuco eruption

Nelson Bègue, Damien Vignelles, Gwenaël Berthet, Thierry Portafaix, Guillaume Payen, Fabrice Jégou, Hassan Benchérif, Julien Jumelet, Jean-Paul Vernier, Thibaut Lurton, Jean-Baptiste Renard, Lieven Clarisse, Vincent Duverger, Françoise Posny, Jean-Marc Metzger, and Sophie Godin-Beekmann

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Final revised paper (published on 19 Dec 2017)
Preprint (discussion started on 22 Jun 2017)

Interactive discussion

Status: closed

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

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RC1: 'Review of Bègue et al., 2017', Anonymous Referee #1, 22 Jul 2017
RC2: 'Review of the discussion paper by Bègue et al., 2017', Vladislav Gerasimov, 29 Jul 2017
RC3: 'Review of "Long-range isentropic transport of stratospheric aerosols over Southern Hemisphere following the Calbuco eruption in April 2015"', Anonymous Referee #3, 03 Aug 2017
AC1: 'Author comments', Nelson Bègue, 10 Oct 2017

Peer-review completion

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

AR by Nelson Bègue on behalf of the Authors (10 Oct 2017) Author's response Manuscript

ED: Referee Nomination & Report Request started (12 Oct 2017) by Anja Schmidt

RR by Anonymous Referee #1 (12 Oct 2017)

RR by Anonymous Referee #3 (24 Oct 2017)

Suggestions for revision or reasons for rejection

Minor revisions:

1) Page 2, line 27 and 28 -- the revised manuscript now has improved
sentence in lines 25-29 but whilst the Froyd et al. paper is a good
reference for the presence of the organic material, for the meteoric
influence, I recommend instead citing the Mossop (1965) paper which
presents the observations of the refractory cores within the stratospheric
aerosol particles, and to also cite Murphy et al. (1998) as the paper
that demonstrated the meteoric signature from the PALMS measurements.

I am suggesting just to add "Mossop (1965), Murphy et al. (1998)" there,
and suggest to remove the citation to Neely et al. (2011) in this particular
sentence as these earlier studies were the key papers.

2) Please add Guo et al. (2004) to reference list -- see citation below.

3) page 11, line 13 -- change "9% precision" to "9% error"

4) page 14 lines 29-30 -- this sentence does not make sense.
Please re-word or remove. Also typo: horiz resolution says 500km
but I assume you mean 50km?

5) page 14 line 33 -- Re-word this setence "possible for solid aerosols such as ash to be incorrectly identified as ice nuclei” -- this sentence doesn't
make sense -- please clarify or perhaps this sentence could be deleted?

6) page 15 line 12 -- "daily-integrated LiDAR" -- I don't understand what
you mean here -- suggest to delete "daily-integrated" or maybe you
meant "once-per-day"? -- If so then just say "daily" not "daily-integrated".

7) page 15, line 15 -- typo: replace "DV" with "dV".

8) page 15, lines 20-21 "too low to properly detected by" -- there are
a few missing words in this sentence, please re-word.

9) I noticed that in the reference list there was a Kravitz et al. (2002)
reference for a paper on stratospheric geoengineering with black
carbon -- that is a 2012 paper not 2002. But more than that it is
not cited in the paper so should be removed.
Also Jaeger and Jegou references need to come before those
beginning with K.

10) Page 16 lines 4-7 -- this sentence referring to growth and loss processes
in the Pinatubo plume is too detailed for this paper --- it's good that you
have the previous sentence giving this context, but this is too much
information for this paper here. Also that is not correct that "particle loss"
tends to reduce effective radius. If the words "new particle formation" were
used instead of "particle loss" that could work -- and could keep that
sentence if that change was made -- but my feeling is that this paper
is not the right place to present this further discussion of the Pinatubo case.

11) The authors have revised the caption to Figure 8 (now referring to
ground-based and space-borne lidar rather than just lidar and CALIOP).
That improved that caption. The same change should be made to the
caption of Figure 7 (that still has the wording Figure 8 originally had before
the revision was made).

12) Page 16 -- the new text has "per cm^3" in several places in the text.
Please revised to "cm^{-3}" i.e. follow the ACP recommended way of
denoting "per cubic centimetre".

13) Page 17, lines 30-31 -- the new sentence here does not make sense
and needs to be re-worded. It currently says "As a consequence, the
transport of the Calbuco plume at another isentropic level associate
to another pathways described above is possible." -- please re-word.

References:

Guo, et al. (2004), "Re-evaluation of SO2 release of the 15 June 1991
Pinatubo eruption using ultraviolet and infrared satellite sensors"
Geochemistry, Geophysics, Geosystems, vol. 5, no.4.
doi:10.1029/2003GC000654.

Mossop, S. C. (1965), "Stratospheric particles at 20 km altitude"
Geochemica et Cosmochimica Acta, ol. 29, pp. 201--207

Murphy et al. (1998), "In Situ Measurements of Organics, Meteoritic
Material, Mercury, and Other Elements in Aerosols at 5 to 19 Kilometers",
Science, vol. 282, 1664-1669.

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RR by Vladislav Gerasimov (24 Oct 2017)

ED: Publish subject to minor revisions (review by editor) (24 Oct 2017) by Anja Schmidt

AR by Nelson Bègue on behalf of the Authors (02 Nov 2017) Author's response Manuscript

ED: Publish as is (06 Nov 2017) by Anja Schmidt

Short summary

The space–time evolutions of the Calbuco plume are investigated by combining satellite, in situ aerosol counting and lidar observations, and a numerical model. All the data at Reunion Island reveal a twofold increase in the amount of aerosol with respect to the values observed before the eruption. The dynamic context has favored the spread of the plume exclusively in the Southern Hemisphere. This study highlights the role played by dynamical barriers in the transport of atmospheric species.