Code Table 4.2 - add pH in discipline 0 category 20

[sebvi]

Summary and purpose

ECMWF is proposing to add (potential of Hydrogen (pH) as a new physical property in Code Table 4.2 discipline 0 category 20.

Action proposed

The team is kindly asked to review and approve the contents for inclusion within the next update to the WMO Manual on Codes.

Discussions

In order to encode several pH values of interest (acidity in rain/cloud), ECMWF is requesting a new "pH" entry in code table 4.2

Detailed proposal

add in Code Table 4.2 discipline 0 category 20

Code	Meaning	Units
18	Potential of Hydrogen (pH)	pH

[amilan17]

@amilan17 create branch

[sebvi]

branch updated

[amilan17]

@marijanacrepulja - please confirm branch validation and move to 'ready for FT' column.

[marijanacrepulja]

@amilan17 thank you. I confirm the brach is updated accordingly and moved it to 'ready for FT' column.