...
The mass mixing ratios (mmr) in SCREAM atmospheric driver(AD) are “wet” mmr[units: kg-of-specie/kg-of-moist-air]. For each parameterization called by AD, it is the responsibility of the parameterization to convert wet mmr to dry mmr [units: kg-of-specie/kg-of-dry-air](if needed) for its use. The tendencies computed by the parameterization should be converted back to wet mmr before they are passed on to AD. For parameterizations which exclusively use wet mmr, there is no need for any conversion however, for parameterizations which use dry mmr, following steps must be followed:
...
calculate_wetmmr_from_drymmr
Volume Mixing ratios (vmr)[units: kmol-of-specie/kmol-of-(dry or moist)-air]:
Some parameterizations may use vmr. For these parameterizations, SCREAM provide the following functions to convert between mmr and vmr (and vice versa):
...