Articles | Volume 22, issue 1
https://doi.org/10.5194/os-22-653-2026
© Author(s) 2026. This work is distributed under the Creative Commons Attribution 4.0 License.
Characteristics of ocean mesoscale eddies in the Canadian Basin from a high resolution pan-Arctic model
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- Final revised paper (published on 17 Feb 2026)
- Supplement to the final revised paper
- Preprint (discussion started on 30 Jul 2025)
Interactive discussion
Status: closed
Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor
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RC1: 'Comment on egusphere-2025-3527', Anonymous Referee #1, 26 Aug 2025
- AC3: 'Reply on RC1', Noémie Planat, 25 Nov 2025
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RC2: 'Comment on egusphere-2025-3527', Anonymous Referee #2, 05 Sep 2025
- AC2: 'Reply on RC2', Noémie Planat, 25 Nov 2025
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EC1: 'Comment on egusphere-2025-3527', Julian Mak, 06 Sep 2025
- AC1: 'Reply on EC1', Noémie Planat, 25 Nov 2025
Peer review completion
AR – Author's response | RR – Referee report | ED – Editor decision | EF – Editorial file upload
AR by Noémie Planat on behalf of the Authors (25 Nov 2025)
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ED: Referee Nomination & Report Request started (29 Nov 2025) by Julian Mak
RR by Anonymous Referee #1 (01 Jan 2026)
ED: Publish subject to minor revisions (review by editor) (02 Jan 2026) by Julian Mak
AR by Noémie Planat on behalf of the Authors (26 Jan 2026)
Author's response
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ED: Publish subject to technical corrections (30 Jan 2026) by Julian Mak
AR by Noémie Planat on behalf of the Authors (04 Feb 2026)
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This paper uses a 1/12 degree ocean general circulation model to studies the statistics of ocean mesoscale eddies in the Beaufort gyre of the Arctic Ocean. The authors focus on the period 1995-2020. The authors show strong regional and temporal variability. There is strong linkage with the sea ice cover, while the seasonality of the eddies is weaker during the pycnocline. The authors find, that except along the Chukchi shelf break, that most eddies have little to no temperature signal. The eddies in the upper layer increase with time over the simulation. The authors also suggest that the results from ITPs that suggest most Beaufort Gyre eddies are anti-cyclonic may be due to sampling bias.
This is an interesting paper, well worth publishing. And appropriate for Ocean Science. That said, there are ways the manuscript could be improved and I would suggest major revisions. Detailed justification is provided below.
Major points for further discussion or analysis:
Is a 1/12 degree model really high resolution? Many models of higher resolution now exist – for example there are papers that look at eddies at 1/60 degree in simulations of the Arctic Ocean, Nordic Seas and the Labrador Sea, for example. The advantage of a 1/12 degree simulation is the length of integration for the analysis. So, as long as the given resolution is able to resolve a significant part of the eddy spectrum at the given resolution, I can understand the authors using the configuration they did. But I’d like to see some more discussion of mesoscale eddies and understand how they are represented in CREG12. Given the model’s stratification, could the authors provide information on where the Rossby Radius is resolved and with how many grid cells, especially at the margins of the Beaufort Gyre. And if the motivation to use 1/12 degree is the longer timeseries, this needs to be discussed. As well, some discussion of what is found at higher resolution is needed to provide the reader with confidence with respect to their results at the given resolution.
I’m trying to understand what the authors’ number of eddies mean. The paper states about 6,250 eddies are detected per year and per depth level. That seems like a huge number. First off, I understand the authors point about the difficulty in determining the vertical coherence of the eddies. And the authors do show some changes with depth. But just saying per depth level makes it seem like there are significantly more eddies that there actually are – given most eddies are likely found through multiple levels. In might be better to average numbers over several levels and then state there are on average X eddies detected per year above pycnocline, Y in the pycnocline and Z below it (or using some other depth metric).
Additionally, how many eddy exist per day, on average (i.e. a timeseries by day through the mean seasonal cycle)? I wonder if the large yearly number if because of the short duration of the eddies being a function of them being lost by the tracking software, then re-found and thus recounted as a new eddy. A median duration of 4 days is short! Or if the eddies are being damped quickly given the setting at the given model resolution? If I look at figure 3c, I don’t see that many eddies on the given day (with generally very short trajectories), so I am wanting more discussion of this, to help understand what that large eddy number the paper provides really means. The author’s do bring up the idea of turbulent soup, which I like – but I still feels this topic does need more to help the reader understand what the results mean.
The authors talk about no temperature signal – what about salinity? The eddies like play an important role in freshwater exchange into and out of the gyre. This would be good to further explore.
Strong increase in 2008 – BG spin-up and/or low ice year?
I have some technical questions about the model configuration and experiment. What does constraining the model to *about* 1.4 Sv at Bering Strait mean? A constant value with time? Constant annual mean? An annual mean of ~1.4 Sv with interannual variability? Additionally, this value seems a bit large compared to the observations. As well, does the model consider the increase in recent years suggested with the observations? As well, what are the heat and freshwater transports, and how do they compare with the observations?
The river runoff I think needs to better explained. I thought the Stadnyk et al. paper mentioned uses the AHYPE model? And wasn’t the output from that model used in Weiss-Gibbons et al., 2025? And in either case, I don’t believe the AHYPE output provided Greenland discharge? Are you sure that didn’t come from a different product?
Given the importance of the sea-ice in setting the seasonal cycle of the eddies, more on the model representation of sea-ice would be useful. What does comparable to that derived from satellite observations mean in practice? Especially given that the authors use ERA5 for forcing, which has a known warm bias in the Arctic. So I’m curious about what parameter set for SI3 was able to allow the simulation to get sea ice fields close to the satellite observations.
Given the discussion of the three main water masses, I would also be curious to see a time series of salinity (or freshwater content) in the model, compared to the Beaufort Gyre Experiment results. Especially since Rosenblum et al. has pointed out that many models under-estimate the freshwater content in the region. Also, why use fixed depth layers for the vertical splitting, instead of isopyncals (or isohalines) to define the different water masses?
Finally, given the authors look at changes with time, as the amount of sea ice is being reduced, can the authors speculate about what their results may mean for the future. And discuss the implications for those potential changes.
End the discussion with more discussion on the limitations of the model and the present study.
Smaller items
Line 19 – The increase in the AW layer is over what time period?
Figures 1, 3, 5, 6: Please use discrete color contour intervals to make the figures easier to read.
Figure 2. Could you explain in more detail how the anomalies are calculated, rather than just saying similarly from monthly mean anomalies.
Line 333. Is this small decrease significant?
L335: Might some of the increase with time be a function of changes in the winds and energy input with time?
L348. Half more eddies doesn’t read well.
Figure 7 caption. What does gradient of the SSH averaged over the CB mean?
Table 2. Remind people of the layer definitions in the table or caption.