= Name and subject of the action

Last edition: '''[[Wikinfo(changed_ts)]]''' by '''[[Wikinfo(changed_by)]]'''

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.

[[PageOutline(2, , inline)]]
 
== Summary

||=Action       || MOI-02_MOI-GLS-ICE                       ||
||=PI(S)        || Bricaud Clément                          ||
||=Digest       || improve GLS    ||
||=Dependencies || no                                             ||
||=Branch       || source:/NEMO/branches/2021/dev_r14318_MOI-02_MOI-GLS-ICE/ ||
||=Previewer(s) || Names                                                 ||
||=Reviewer(s)  || Names                                                 ||
||=Ticket       || #2604                                                 ||

=== Description

2 improvevments for GLS:

- scaling of mixing under sea-ice ( do as it is in TKE)
- add limit condition under ice shelves   


=== Implementation

==== improve GLS scaling of mixing under sea-ice ( do as it is in TKE)

4 options of scaling under sea oce are available for TKE; 

0: no scaling

1: scale with constant sea-ice thickness

2: scaling with mean sea-ice thickness

3: scaling with max sea-ice thicknesss

only one is available for GLS: scaling with constant  roughness, equivalent to CASE 1 in TKE.


- Options 0,1,3 should be addded in GLS

- As for TKE,  nn_mxlice wil be added in namelist


==== add limit condition under ice shelves   

Surface boundary condition should be modified under the ice-shelves seas:

- for TKE and psi

- for Neumann and Dirichlet conditions


=== Documentation updates

{{{#!box width=55em help
Using previous parts, define the main changes to be done in the NEMO literature 
(manuals, guide, web pages, …).
}}}

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== Preview 

{{{#!box width=50em info
[[Include(wiki:Developers/DevProcess#preview_)]]
}}}

''...''

== Tests

==== GLS scaling of mixing under sea-ice

 
The MXLICE_ORCA2.pdf​ in #2604 show some the effects of the different scaling with GLS on the reference ORCA2_ICE configuration.

Introducing the scaling of mixing under sea-ice in GLS doesn't change the results whit default paramater (TKE). Tested with SETTE.

SETTE tests are OK when activating GLS and mixing under sea-ice.

Commited in trunk at rev 14966 (see https://forge.ipsl.jussieu.fr/nemo/changeset/14966 )



==== add GLS limit condition under ice shelves   

Introducing the  GLS limit condition under ice shelves doesn't change the results whit default paramater (TKE). Tested with SETTE.

SETTE tests are OK when activating GLS.

Commited in trunk at rev 14967 ( see https://forge.ipsl.jussieu.fr/nemo/changeset/14967 )

== Review

{{{#!box width=50em info
[[Include(wiki:Developers/DevProcess#review)]]
}}}

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