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Prosed Plan:

The mass mixing ratios (mmr) in SCREAM atmospheric driver(AD) are “wet” mixing ratiosmmr. For each parameterization called by AD, it is the responsibility of the parameterization to convert wet mixing ratios mmr to dry mixing ratios mmr (if needed) for its use. The tendencies computed by the parameterization should also be converted back to wet mixing ratios mmr before they are passed on to AD. For parameterizations which exclusively use wet mixing ratiosmmr, there is no need for any conversion however, for parameterizations which use dry mixing ratiosmmr, following steps must be followed:

1. Interface layer of parameterization should convert wet mixing ratio mmr to dry mixing ratiosmmr

2. Parameterization computes tendencies using the dry mixing ratios mmr internally

3. Interface layer of the parameterization will then convert the dry mixing ratio mmr tendencies to wet mixing ratiosmmr

4. These wet mixing ratio mmr tendencies are then passed on to AD

SCREAM provides provide following methods for converting dry mixing ratios mmr to wet mixing ratios mmr and vice versa via functions:

calculate_drymmr_from_wetmmr

calculate_wetmmr_from_drymmr

Volume Mixing ratios (vmr):

Some parameterizations may use vmr. For these parameterizations, SCREAM provide the following functions to convert between mmr and vmr (and vice versa):

calculate_mmr_from_vmr

calculate_vmr_from_mmr

vmr can be dry or wet, appropriate conversion should be made based on parameterization requirements. Tendencies computed by the parameterization should be converted back to wet mmr before passing these back to AD.

Type of mixing ratios used by SCREAM parameterization:

1. P3 - Dry mixing ratiosmmr

2. SCREAM - Dry mixing ratiosmmr

3. HOMME - Wet mixing ratiosmmr

4. RRTMGP - ?Wet vmr

Tasks:

P3 (uses dry mixing ratios mmr):

•  Ensure that P3 converts wet mixing ratios mmr to dry mixing ratios mmr for all constituents in its interface layer
•  Ensure that tendencies from P3 are converted back to wet mixing ratiosmmr

SHOC ([uses dry mixing ratios) mmr]:

•  Ensure that SHOC converts wet mixing ratios mmr to dry mixing ratios mmr for all constituents in its interface layer
•  Ensure that tendencies from SHOC are converted back to wet mixing ratiosmmr

RRTMGP (uses ? mixing ratios)[uses wet vmr]:

•  Ensure that RRTMGP ??converts wet mmr to wet vmr
•  Ensure that tendencies from RRTMGP ???are converted back from wet vmr to wet mmr