Version 7 (modified by gm, 3 years ago) (diff)

ENHANCE-17 — Multi-Column Ocean scheme (MCO)

The PI is responsible to closely follow the progress of the action, and especially to contact NEMO project manager if the delay on preview (or review) are longer than the 2 weeks expected.


The action has to be detailed briefly in the 'Summary' section for later inclusion in other pages.
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PI(S) Previewer(s) Reviewer(s)

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Action ENHANCE-17 — MCO (Multi-Column Ocean scheme)
PI(S) Gurvan Madec & Antoine Barthélemy


Introduction of the Multi-Column Ocean scheme (MCO) developed by Barthélemy et al. (Ocean Modelling 2016), i.e. a subgrid-scale representation of ice-ocean interactions.

LIM3 includes an ice thickness distribution, which provides heterogeneous surface buoyancy fluxes and stresses. The MCO scheme take them explicitly into account, by computing convection and turbulent vertical mixing separately in the open water/lead fraction of grid cells and below each ice thickness category. The resulting distinct temperature and salinity profiles of the ocean columns are allowed to be maintained over several time steps.

Dependencies Depends on nothing
Target 2017 merge party
Trac Ticket #1918
SVN branch source:/branches/2017/dev_r8218_ENHANCE17_MCO
Previewer(s) -
Reviewer(s) -
Status Started and ongoing : the MCO scheme resulting from Antoine's PhD work is now saved on the branch. This was the major objective: a branch with MCO before Antoine leaves the research community. Its return back to a reference version is a much lower priority, and requires a significant amount of work.

'.' => '/nemo/wiki/2017WP/ENHANCE-17_Gurvan_MCO'


This section should be completed before starting to develop the code, in order to find agreement on the method beforehand.



Reference manual and web pages updates

Updated on 07/07/2017 16:59:26 by gm

Once the PI has completed this section, he should send a mail to the previewer(s) asking them to preview the work within two weeks.


Since the preview step must be completed before the PI starts the coding, the previewer(s) answers are expected to be completed within the two weeks after the PI has sent his request.
For each question, an iterative process should take place between PI and previewer(s) in order to reach a "YES" answer for each of the following questions.

Questions Answer Comment
Does the previewer agree with the proposed methodology?
Does the previewer agree with the proposed flowchart and list of routines to be changed?
Does the previewer agree with the proposed new list of variables, including agreement with coding rules?
Does the previewer agree with the proposed summary of updates in reference manual?
… … …

Updated on 11/28/2020 01:02:07 by anonymous

Once all "YES" have been reached, the PI can start the development into his development branch.


Once the development is done, the PI should complete this section below and ask the reviewers to start their review in the lower section.

Questions Answer Comment
Can this change be shown to produce expected impact? (if option activated)?
Can this change be shown to have a null impact? (if option not activated)
Detailed results of restartability and reproducibility when the option is activated. Please indicate the configuration used for this test
Detailed results of SETTE tests (restartability and reproducibility for each of the reference configuration)
Results of the required bit comparability tests been run: Are there no differences when activating the development?
If some differences appear, is reason for the change valid/understood?
If some differences appear, is the !ticket describing in detail the impact this change will have on model configurations?
Is this change expected to preserve all diagnostics?
If no, is reason for the change valid/understood?
Are there significant changes in run time/memory?
… … …

Updated on 11/28/2020 01:02:07 by anonymous


A successful review is needed to schedule the merge of this development into the future NEMO release during next Merge Party (usually in November).

Code changes and documentation

Question Answer Comment
Is the proposed methodology now implemented?
Are the code changes in agreement with the flowchart defined at Preview step?
Are the code changes in agreement with list of routines and variables as proposed at Preview step?
If not, are the discrepancies acceptable?
Is the in-line documentation accurate and sufficient?
Do the code changes comply with NEMO coding standards?
Is the !ticket of development documented with sufficient details for others to understand the impact of the change?
Are the reference manual tex files now updated following the proposed summary in preview section?
Is there a need for some documentation on the web pages (in addition to in-line and reference manual)?
If yes, please describe and ask PI. A yes answer must include all documentation available.
… … …

Review Summary

Is the review fully successful?

Updated on 11/28/2020 01:02:07 by anonymous

Once review is successful, the development must be scheduled for merge during next Merge Party Meeting.