Relationships between Arctic sea ice drift and strength modelled by NEMO-LIM3.6

Docquier, David; Massonnet, François; Barthélemy, Antoine; Tandon, Neil F.; Lecomte, Olivier; Fichefet, Thierry

doi:https://doi.org/10.5194/tc-11-2829-2017

Articles | Volume 11, issue 6

https://doi.org/10.5194/tc-11-2829-2017

© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

https://doi.org/10.5194/tc-11-2829-2017

© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 11, issue 6

Research article

|

11 Dec 2017

Research article |

| 11 Dec 2017

Relationships between Arctic sea ice drift and strength modelled by NEMO-LIM3.6

David Docquier, François Massonnet, Antoine Barthélemy, Neil F. Tandon, Olivier Lecomte, and Thierry Fichefet

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Final revised paper (published on 11 Dec 2017)
Preprint (discussion started on 25 Apr 2017)

Interactive discussion

Status: closed

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

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- Supplement

RC1: 'Review of "Arctic sea ice drift-strength feedback modelled by NEMO-LIM3.6"', Anonymous Referee #1, 23 May 2017
- AC1: 'Reply to Referee 1', David Docquier, 13 Jul 2017
RC2: 'Comments on "Arctic sea ice drift-strength feedback modelled by NEMO-LIM3.6" by Docquier et al.', Anonymous Referee #2, 02 Jun 2017
- AC2: 'Reply to Referee 2', David Docquier, 13 Jul 2017

Peer-review completion

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

AR by David Docquier on behalf of the Authors (13 Jul 2017) Author's response Manuscript

ED: Referee Nomination & Report Request started (17 Jul 2017) by Dirk Notz

RR by Anonymous Referee #2 (03 Aug 2017)

Suggestions for revision or reasons for rejection

Review comments on "Interactions between Arctic Sea ice drift and strength modelled by NEMO-LIM3.6" by Docquier et al.

1. General comments

As a whole, the authors addressed the points raised by the two reviewers and the manuscript has been improved significantly. Particularly, the sensitivity experiment changing ice strength P* made the interpretation of the result clearer. The results summarized in Fig. 8, 9 and 11 - 13 provide useful information for modelers working with different sea ice models. The thorough examinations and assessments of the model results using observed sea ice data can be a good exemplar for forthcoming studies in similar topic. However, I suggest to address the following minor points before publication.

2. Specific points

- Page 1, line 13-15: I suggest to put an additional sentence to mention what we learned regarding drift - strength relation from the sensitivity experiment, otherwise readers cannot understand the necessity of the sensitivity experiment in the context of this study.

- Page 8, line 19-20: The use of the term "Bootstrap" is confusing. The author described that "The OSI SAF algorithm ... is a linear combination of the Bootstrap algorithm ... and the Bristol algorithm ..." (Page 5, line 23-25), while at the same time, provided a sentence "The Bootstrap algorithm provides higher concentration than OSI SAF, ..." (Page 8, line 19-20). A consistent use of the term or further explanation is needed.

- Page 10, line 20; Page 12, line 3; Page 15, line 21; page 16, line 3: The authors used a term "interaction" to describe the relation between ice drift and ice strength, while in this study, only one direction of the dynamical influence (i.e., effect of ice strength on the drift speed) was examined and the other direction (i.e., effect of ice drift change on ice strength) was not examined. From this point of view, I think it is appropriate to use a term "relation" instead of "interaction", since the study did not clarify the consequence of ice drift change on ice strength.

- Page 12, line 13-14: I think "control" is not a suitable verb to describe the results shown in this study, since it implies the drift speed is a function of ice concentration and thickness only. As shown in the hysteresis loop in Fig. 11 and 13, there are other unknown controlling factors for ice drift speed. Therefore, I suggest to rephrase ".. is controlled .. " by " .. is strongly influenced ..".

- Page 15, line 23-25: As mentioned above, the existence of the hysteresis loop indicates there are other unknown factors which influence ice drift speed. I suggest to address this for future study.

- Figure 13 a : It is difficult to identify the correspondence of the color of the regression lines to the different P* values. Please provide additional legend to describe the correspondence.

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RR by Anonymous Referee #1 (01 Sep 2017)

ED: Reconsider after major revisions (06 Sep 2017) by Dirk Notz

AR by David Docquier on behalf of the Authors (02 Oct 2017) Author's response Manuscript

ED: Referee Nomination & Report Request started (12 Oct 2017) by Dirk Notz

RR by Anonymous Referee #2 (30 Oct 2017)

ED: Publish subject to minor revisions (review by editor) (02 Nov 2017) by Dirk Notz

AR by David Docquier on behalf of the Authors (03 Nov 2017) Author's response Manuscript

ED: Publish as is (06 Nov 2017) by Dirk Notz

AR by David Docquier on behalf of the Authors (06 Nov 2017)

Short summary

Our study provides a new way to evaluate the performance of a climate model regarding the interplay between sea ice motion, area and thickness in the Arctic against different observation datasets. We show that the NEMO-LIM model is good in that respect and that the relationships between the different sea ice variables are complex. The metrics we developed can be used in the framework of the Coupled Model Intercomparison Project 6 (CMIP6), which will feed the next IPCC report.