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New parameters in Code Table 4.2 #286

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sebvi opened this issue Nov 10, 2024 · 6 comments · May be fixed by #293
Open

New parameters in Code Table 4.2 #286

sebvi opened this issue Nov 10, 2024 · 6 comments · May be fixed by #293
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@sebvi
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cryosphere ocean weather
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FT2025-1

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sebvi commented Nov 10, 2024 •
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Initial request

The parameter “Live fuel moisture content” (discipline=2, parameter category=4, parameter number =31) can be subdivided into a component for low and high vegetation. We propose to add these two additional entries.

The Obukhov Length (L) is a well-established parameter in boundary layer meteorology. We propose to add the reciprocal Obukhov length (1/L) because L can be infinite in certain cases of neutral stability.

ECMWF is also requesting a set of ocean parameters needed for our latest development so that more of the ocean output portfolio can be made available in GRIB. Note that due to the organisation of the oceanography discipline, we need to request the same parameter in 3 different categories.

Amendment details

ADD to code table 4.2: Product discipline 2 , parameter category 4

Code Description Unit
37 Live fuel moisture content in low vegetation kg kg-1
38 Live fuel moisture content in high vegetation kg kg-1

ADD to code table 4.2: Product discipline 0 , parameter category 7

Code Description Unit
21 Reciprocal Obukhov length m-1

ADD to Code table 4.2: Product discipline 0, parameter category 4

Code Description Unit
63 Diffuse short-wave radiation flux, clear sky W m-2

ADD to code table 4.2: Product discipline 10, parameter category 2

Code Description Unit
30 Downward short-wave radiation flux W m-2

ADD to code table 4.2: Product discipline 10, parameter category 3

Code Description Unit
22 Downward short-wave radiation flux W m-2

ADD to code table 4.2: Product discipline 10, parameter category 4

Code Description Unit
55 Sea water upward volume transport m3 m-2 s-1
56 Sea water upward mass transport kg m-2 s-1
57 Sea water age since surface contact s
58 Sea water downward short-wave radiation flux W m-2

Comments

No response

Requestor(s)

Sebastien Villaume (ECMWF) 
Robert Osinski (ECMWF) 
Matthew Griffith (ECMWF) 

Stakeholder(s)

ECMWF

Publication(s)

Manual on Codes (WMO-No. 306), Volume I.2, GRIB code table 4.2, discipline 2, category 4 (update) 
Manual on Codes (WMO-No. 306), Volume I.2, GRIB code table 4.2, discipline 0, category 7 (update)
Manual on Codes (WMO-No. 306), Volume I.2, GRIB code table 4.2, discipline 0, category 4 (update)
Manual on Codes (WMO-No. 306), Volume I.2, GRIB code table 4.2, discipline 10, category 3 (update)
Manual on Codes (WMO-No. 306), Volume I.2, GRIB code table 4.2, discipline 10, category 3 (update)
Manual on Codes (WMO-No. 306), Volume I.2, GRIB code table 4.2, discipline 10, category 4 (update)

Expected impact of change

None

Collaborators

No response

References

No response

Validation

No response
@sebvi sebvi self-assigned this Nov 10, 2024
@amilan17
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https://github.com/wmo-im/tt-tdcf/wiki/2024.11.12.tt.tdcf notes:

  • Sebastien introduced the proposal
  • these parameters have been encoded in NetCDF and the NEMO ocean model at ECMWF
  • Sibylle suggested adding a new category under discipline 10 instead of repeating parameters in multiple categories

@amilan17 amilan17 moved this from Submitted to In progress in GRIB2 Amendments Nov 12, 2024
@amilan17 amilan17 added this to the FT2025-1 milestone Nov 12, 2024
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amilan17 commented Dec 3, 2024 •
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https://github.com/wmo-im/tt-tdcf/wiki/2024.11.12.tt.tdcf notes:
Matthew explained the problem with adding a new category would require deprecation of the other parameters; Sibylle noted that it would be better to add a note to use the values in the new category instead because this would set a better practice; Jeff noted that the combination of discipline/category/parameter defines the uniqueness of the parameter;

  • need comments from the ocean community on the repetition of parameters across different 4.2 tables before 20 December: @david-i-berry and Matthew will reach out to NEMO

@sebvi
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sebvi commented Dec 20, 2024

This is the comment we received about classifying parameters in oceanography:

Pablo Ortega BSC:
I'm not sure it is worth changing the classification.
From the list [of possible additional NEMO parameters] it seems that most of them are surface fluxes, which share very similar characteristics in terms of vertical location, so it would be wise to group them according to that criteria, which I understand is the current one, right? The same applies to the integrated ocean variables.

sebvi added a commit that referenced this issue Dec 23, 2024
@sebvi
issue #286 adding new category for hazards in discipline 20 and assoc…
9a3c9c9 
…iated Code table 4.2 entries
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sebvi commented Jan 5, 2025

Updating entry numbers in code Table 4.2.10.4 as the entries were already assigned

sebvi added a commit that referenced this issue Jan 5, 2025
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issue #286 adding new code table entries
0128e3f
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sebvi commented Jan 10, 2025

branch is updated

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https://github.com/wmo-im/et-data/wiki/2025.01.14.et.data notes:
ready for review, validation not necessary

@amilan17 amilan17 moved this from In progress to In validation / review in GRIB2 Amendments Jan 14, 2025
@amilan17 amilan17 linked a pull request Jan 16, 2025 that will close this issue
issue #286 adding new code table entries #293
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cryosphere ocean weather
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GRIB2 Amendments
Status: In validation / review
Milestone
FT2025-1
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issue #286 adding new code table entries wmo-im/GRIB2
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@sebvi @amilan17