Guidance needed on the units attribute

[jonathanminz-lafiRDM]

Topic for discussion

Currently, the CF conventions recommend that the unit attributes for physical quantities that have units of the form kg per kg or m³ per m³ should be 1. However, we would like to record the actual units as well with the dataset. Is there some other attribute that this information can be captured in ?
Thank you for the guidance.

[DocOtak]

Hi @jonathanminz-lafiRDM you are free to use those units are remain valid CF. In section 3.1.1.:

As an alternative to the canonical units of 1 or some other unitless number, the units for a dimensionless quantity may be given as a ratio of dimensional units, for instance mg kg-1 for a mass ratio of 1e-6, or microlitre litre-1 for a volume ratio of 1e-6. Data-producers are invited to consider whether this alternative would be more helpful to the users of their data.