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GRIB2
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new entry for "Convectively-induced turbulence" in Code Table 4.2 #218

Closed jbathegit closed 4 months ago

jbathegit commented 10 months ago

Initial request

The NCEP Environmental Modeling Center requests a new parameter in Category 19 of GRIB2 Code Table 4.2.

Amendment details

New entry in Code table 4.2: Name Discipline Category Parameter Units
Convectively-induced turbulence (CIT) (eddy dissipation rate) 0 19 50 m2/3 s-1

Comments

No response

Requestor(s)

NCEP Environmental Modeling Center

Stakeholder(s)

Enter list of stakeholder(s).

Publication(s)

Example: Manual on Codes (WMO-No. 306), Volume I.2, GRIB code table 4.2, discipline 0, category 19

Expected impact of change

None

Collaborators

No response

References

No response

Validation

No response

jbathegit commented 10 months ago

I realize this is probably too late for FT2023-2, and if that's the case then resetting the milestone to FT2024-1 is fine.

sebvi commented 10 months ago

Hi @jbathegit,

We have few turbulence and eddy dissipation parameters in Code Table 4.2 discipline 0 category 19 already: entries 28 to 32. Could you explain how this new parameter relates to the existing ones? is it a new separate contribution to turbulence/eddy dissipation? is it a component of or a contribution to one of the existing parameters? I am not an expert in this, I just want to check

jbathegit commented 10 months ago

Hi @sebvi. According to our experts, CIT (convectively-induced) is completely different from CAT (clear air) or MWT (mountain wave) turbulence. In other words, they are 3 different types of turbulence. Furthermore, the eddy dissipation parameter (defined in existing parameter 30) is a filtered product derived from the maximum of the CIT, CAT, and MWT. So that's why they're requesting a completely new parameter in category 19.

amilan17 commented 9 months ago

https://github.com/wmo-im/CCT/wiki/20.to.22.September.2023 notes:

the team agrees to the proposal;

amilan17 commented 7 months ago

https://github.com/wmo-im/CCT/wiki/Teleconference.21.22.November.2023 notes:

branch is updated and ready for validation

jbathegit commented 7 months ago

branch is updated and ready for validation

Yes, the branch is updated and ready to be merged. Sorry I submitted an unnecessary PR for this!

However, I think we agreed that no formal validation is required and that this is already fully approved for FT2024-1, correct?

amilan17 commented 7 months ago

@jbathegit the only validation needed is editorial and consistency check.