Code Table 4.1 and 4.2: new category for thermodynamical properties in discipline "land surface" and associated parameters

[sebvi]

Initial request

ECMWF is proposing a new category under discipline 2 - Land surface to encode various thermodynamical properties (heat fluxes). This requires a new entry in Code table 4.1 for the new category and a new sub-table 4.2 discipline 2, category 7

Additional, ECMWF is requesting a new parameter in code table 4.2, discipline 0, category 4

Amendment details

ADD new Category in Code Table 4.1 discipline 2 Thermodynamic properties Code	Name
7	Thermodynamic properties

ADD new entries in Code table 4.2 discipline 2 category 7 Parameter number	name	Unit
0	Heat net flux (see Note)	[W m-2]
1	Latent heat net flux	[W m-2]
2	Sensible heat net flux	[W m-2]

ADD new entry in Code table 4.2 discipline 0 category 4 Parameter number	name	Unit
62	Direct normal short-wave radiation flux, clear sky	[W m-2]

ADD new entry in Code Table 4.2 discipline 0 category 19 Parameter number	name	Unit
51	Visibility through precipitation	[m]

Add new entry in Code Table 4.2 discipline 3 category 1 Parameter number	name	Unit
24	Cosine of the solar zenith angle	[Numeric]

ADD new entries to Code Table 4.2 discipline 0 category 2 Parameter number	name	Unit
68	Convective gust	[m s-1]
69	Turbulent gust	[m s-1]

Comments

No response

Requestor(s)

Sebastien Villaume (ECMWF) Matthew Griffith (ECMWF)

Stakeholder(s)

ECMWF EU - Destination Earth programme

Publication(s)

Manual on Codes (WMO-No. 306), Volume I.2, GRIB code table 4.1 (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 2, category 7 (new subtable)

Expected impact of change

LOW

Collaborators

No response

References

No response

Validation

No response

[sebvi]

I have just added parameters that were forgotten

[sebvi]

branch created and updated

[amilan17]

https://github.com/wmo-im/CCT/wiki/Teleconference.2.July.2024 notes: Sebastien introduced the proposal; there was discussion about the "Cosine of the SZA" parameter, but team agrees to proposal in general; @sebvi and @SibylleK check with colleagues on the requirements for cosine;