Periodicity in the BrO∕SO<sub>2</sub> molar ratios in the volcanic gas plume of Cotopaxi and its correlation with the Earth tides during the eruption in 2015

Dinger, Florian; Bobrowski, Nicole; Warnach, Simon; Bredemeyer, Stefan; Hidalgo, Silvana; Arellano, Santiago; Galle, Bo; Platt, Ulrich; Wagner, Thomas

doi:https://doi.org/10.5194/se-9-247-2018

Articles | Volume 9, issue 2

https://doi.org/10.5194/se-9-247-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/se-9-247-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 9, issue 2

Research article

|

07 Mar 2018

Research article |

| 07 Mar 2018

Periodicity in the BrO∕SO₂ molar ratios in the volcanic gas plume of Cotopaxi and its correlation with the Earth tides during the eruption in 2015

Florian Dinger, Nicole Bobrowski, Simon Warnach, Stefan Bredemeyer, Silvana Hidalgo, Santiago Arellano, Bo Galle, Ulrich Platt, and Thomas Wagner

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Final revised paper (published on 07 Mar 2018)
Preprint (discussion started on 04 Sep 2017)

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Status: closed

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

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RC1: 'Review se-2017-89', Anonymous Referee #1, 02 Nov 2017
- AC2: 'Reply on interactive comment of the Anonymous Referee #2 on Periodicity in the BrO/SO2 molar ratios in the volcanic gas plume of Cotopaxi and its correlation with the Earth tides during the eruption in 2015” by Florian Dinger et al', Florian Dinger, 09 Dec 2017
RC2: 'Comments of Referee #2', Anonymous Referee #2, 12 Nov 2017
- AC1: 'Reply on interactive comment of the Anonymous Referee #2 on Periodicity in the BrO/SO 2 molar ratios in the volcanic gas plume of Cotopaxi and its correlation with the Earth tides during the eruption in 2015” by Florian Dinger et al', Florian Dinger, 09 Dec 2017

Peer-review completion

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

AR by Florian Dinger on behalf of the Authors (09 Dec 2017) Author's response Manuscript

ED: Publish subject to minor revisions (review by editor) (21 Dec 2017) by Andrea Di Muro

The authors have provided detailed answers to all questions and remarks of the two reviewers; here below I provide a list of minor/major remarks, which should be taken into account in order to produce a final version of the paper:

MINOR REMARKS
Abstract
Line 6: propose (?): do you mean implies?
Paragraph 2.3
Line 16: ‘which signalized’ (?) do you mean: ‘and that marked the beginning of’…?
Line 20: what does ‘already’ mean?
Line 21 ‘Those…’: is there a missing verb in the sentence?
Line 28 ‘followed by…’; do you mean ‘feeding or generating’?
Paragraph 3.3
Line 3 do you mean ‘high-frequency’?
Lines 19-24: ‘proposes’ means: identifies?
Paragraph 4
Line 25: pattern(s)
Paragraph 5.1
Line 9: match(es)
Paragraph 5.5 ‘distorted’ do you mean ‘deviated’ or something similar?

MAIN REMARKS
Fig. 3: First main remark: please make a better link between the symbol in the legend (BrO < detection) and the data treatment discussed in the appendix for BrO concentrations close or lower than the detection limit;
In any case, I find that the definition and meaning of the long term background trend requires some clarification; In 2016, reported SO2 SCD (and I assume SO2 fluxes too) were very low (<< detection limit?) like before July 2015, but calculated BrO/SO2 ratios are higher; are these estimations and differences reliable? Please clarify this point and how that affects the long term trend and the trend fitting and removal procedure as well. These infos should be added to paragraph 5 (Discussion) too.

Second main remark: the figure 3 should offer a clearer link with the four reported phases of volcanic activity (only one red vertical line marks some explosions) as the time evolution of the ash emissions etc is not clearly reported.

Third main remark: I’m surprised that no general discussion is presented on the correlation (if any) between SO2 flux data and the BrO/SO2 ratio.
This approach could, for instance, be adopted to discuss the link between gas composition and the volcanic activity.

Best regards,

Andrea Di Muro

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AR by Florian Dinger on behalf of the Authors (11 Jan 2018) Author's response Manuscript

ED: Publish as is (29 Jan 2018) by Andrea Di Muro

ED: Publish as is (29 Jan 2018) by Joachim Gottsmann (Executive editor)

AR by Florian Dinger on behalf of the Authors (31 Jan 2018)

Short summary

We monitored the bromine monoxide-to-sulfur dioxide molar ratio in the effusive gas plume of Cotopaxi volcano in order to gain insight into the geological processes which control the pressure regime of the volcanic system. We observed a conspicuous periodic pattern with a periodicity of about 2 weeks, which significantly correlates with the Earth tidal forcing. Our results support a possible Earth tidal impact on volcanic activity, in particular for the Cotopaxi eruption 2015.

Periodicity in the BrO∕SO2 molar ratios in the volcanic gas plume of Cotopaxi and its correlation with the Earth tides during the eruption in 2015

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Periodicity in the BrO∕SO₂ molar ratios in the volcanic gas plume of Cotopaxi and its correlation with the Earth tides during the eruption in 2015