Geochemical signatures of pingo ice and its origin in Grøndalen, west Spitsbergen

Demidov, Nikita; Wetterich, Sebastian; Verkulich, Sergey; Ekaykin, Aleksey; Meyer, Hanno; Anisimov, Mikhail; Schirrmeister, Lutz; Demidov, Vasily; Hodson, Andrew J.

doi:https://doi.org/10.5194/tc-13-3155-2019

Articles | Volume 13, issue 11

https://doi.org/10.5194/tc-13-3155-2019

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

https://doi.org/10.5194/tc-13-3155-2019

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

Articles | Volume 13, issue 11

Research article

|

28 Nov 2019

Research article |

| 28 Nov 2019

Geochemical signatures of pingo ice and its origin in Grøndalen, west Spitsbergen

Nikita Demidov, Sebastian Wetterich, Sergey Verkulich, Aleksey Ekaykin, Hanno Meyer, Mikhail Anisimov, Lutz Schirrmeister, Vasily Demidov, and Andrew J. Hodson

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Interactive discussion

Status: closed

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

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RC1: 'Review of ‘Pingo development in Grøndalen, West Spitsbergen’ by Demidov et al.', Trevor Porter, 29 May 2019
- AC1: 'Response to referee 1 (Trevor Porter) comments', Nikita Demidov, 31 Aug 2019
RC2: 'Review comments', Go Iwahana, 27 Jun 2019
- AC2: 'Response to referee 2 (Go Iwahana) comments', Nikita Demidov, 31 Aug 2019

Peer-review completion

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

ED: Publish subject to minor revisions (review by editor) (18 Sep 2019) by Peter Morse

Dear Dr. Demidov,

Thank you for your thorough response to reviewer's comments. Please submit your revised version of the manuscript for my review.

I have a few points that I would like you to please address:

1. Include photographs of the core in Supplementary Material.

2. Regarding the drill dimensions, just report the internal diameter, that is, the diameter of the extracted core.

3. Regarding Reviewer 2 comment for P4, L15, please indicate that cores were retrieved at intervals of 0.5 to 1.0 m, and the assembled cores were subsampled at XX intervals for analysis.

4. Regarding your model for pingo ice development: You base your interpretation on a segregated ice development model, with migration of water to the freezing front, but Reviewer 2 suggest the possibility of an intrusive ice origin. Mackay (1979, 1985, 1986) discusses a segregated-injection ice model that can switch between modes depending on rate of freezing. The air bubble morphology may tell you something more about the ice formation mechanism. aligned bubbles are often related to segregated ice development, whereas irregular bubbles can be associated with freezing of bulk water. You should look into this, and determine if an injection origin is possible and consider if this may affect any interpretations.

Thank you for your efforts. I look forward to the revised manuscript.

Sincerely,

Peter

Mackay JR. 1979. Pingos of the Tuktoyaktuk Peninsula area, Northwest
Territories. Géographic Physique et Quaternaire 33: 3–61.

Mackay JR. 1985. Pingo ice of the western Arctic coast, Canada. Canadian Journal of Earth Sciences 22: 1452-1464. DOI: 10.1139/e85-151

Mackay JR. 1986. Frost mounds. In Focus: Permafrost geomorphology, French HM (ed.). The Canadian Geographer 30: 363-364. DOI: 10.1111/j.1541-0064.1986.tb01230.x

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ED: Publish subject to minor revisions (review by editor) (26 Sep 2019) by Peter Morse

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ED: Publish subject to minor revisions (review by editor) (09 Oct 2019) by Peter Morse

AR by Nikita Demidov on behalf of the Authors (14 Oct 2019) Author's response Manuscript

ED: Publish subject to minor revisions (review by editor) (15 Oct 2019) by Peter Morse

AR by Nikita Demidov on behalf of the Authors (28 Oct 2019) Author's response Manuscript

ED: Publish as is (29 Oct 2019) by Peter Morse

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Short summary

As Norwegian geologist Liestøl (1996) recognised, in connection with formation of pingos there are a great many unsolved questions. Drillings and temperature measurements through the pingo mound and also through the surrounding permafrost are needed before the problems can be better understood. To shed light on pingo formation here we present the results of first drilling of pingo on Spitsbergen together with results of detailed hydrochemical and stable-isotope studies of massive-ice samples.