new mixed layer depth parameter in Code Table 4.2, Discipline 10 about grib2 HOT 5 OPEN

Dear @SibylleK and Sebastian

ECMWF is producing "mixed layer depth" using several criteria. My understanding is that there are several ways to defined the mixed layer depth based on temperature difference, water density difference, diffusivity difference. Which criteria is used in your case?

In any case we encode our mixed layers using the generic water depth parameter together with entries 169 to 172 in code table 4.5, then specify the relevant value of the threshold using scale factor and scaled value associated with the fixed surface.

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please have a look here to see how we define them: https://codes.ecmwf.int/grib/param-db/?search=%5Emlot&regex=true

follow the link then click on "search" button without changing the regex specified

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2024-05-02 notes:
Sibylle presented the request; Sebastien explained how they do it a different way but is not against the proposal; team agrees to the proposal

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@SibylleK branch is available to update; we will rebase as needed when the split tables PR is merged

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Thank you @amilan17 !
Branch is updated.

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