error converting variable with units kg / kg to g / kg

[haakon-e]

It appears that if a variable has units kg kg^-1, conversion, e.g. to g / kg will not work out-of-the-box.

Instead it is needed to first var2 = set_units(var, "kg/kg") (which actually removes units), then convert_units(var2, "g/kg")

[ph-kev]

ClimaAnalysis.jl relies on Unitful.jl to do the automatic unit conversion for us. It look like if you set the units to "kg/kg", then you get the following for the units:

julia> typeof(var_ones.attributes["units"])
Unitful.FreeUnits{(), NoDims, nothing}

even though nothing is shown when you try to print it. Unitful.jl simplifies the units for you in this case.

For parsing kg kg^-1, Unitful.jl can't handle that. One solution is implementing a parser to transform kg kg^-1 to kg * kg^-1 which does work.

[haakon-e]

I am analyzing a simulation from ClimaAtmos, so I'm not setting units myself, so perhaps some upstream changes are needed in ClimaAtmos?