code table 4.2: cloud water mixing ratio (UK)

[marqh]

Branch

https://github.com/wmo-im/GRIB2/tree/issue88

Summary and purpose

Request for a new code table 4.2 entry for cloud water mixing ratio

Action proposed

The Team is requested to review the proposed new parameter and approve it for implementation.

Discussions

The UK Met Office generates data from its atmosphere models with a model diagnostic of cloud water mixing ratio, which does not appear in the current GRIB parameter code tables. The respesentation this quantity within WMO GRIB2 tables would assist in the sharing of this data. There are already two different cloud ice mixing ratio GRIB2 code table entries:

• 0-1-82
• 0-6-23

each with a unit of measure of kg/kg so cloud water mixing ratio appears a logical addition.

It is not clear to us what the difference between these two quantities is, and why there is a moisture category and a cloud category entry

Finalized proposal

(edited by @jitsukoh June 17)

• Discipline: 0
• Category: 1
• Number: 148 149
• Name: Cloud water mixing ratio
• Units: kg/kg

[marqh]

@richardweedon @mgange659

[richardweedon]

Request the following - Product discipline 0 - Meteorological product parameter category 1: moisture 27 Cloud Water mixing ratio Kg/kg

[jitsukoh]

@richardweedon parameter number 27 is not vacant. You can find vacant numbers in the CSV table; please make sure numbers taken by #85 are not used.

[richardweedon]

Propose resetting the parameter number to 148 (Discipline 0 Category 1 Cloud Water Mixing Ratio Units kg / kg)

[jitsukoh]

@richardweedon @amilan17 I confirm that the proposal is finalized (I updated the original post) and the branch is updated. This is moved to the validated status.