earthkit.meteo.thermo.specific_gas_constant

earthkit.meteo.thermo.specific_gas_constant(q: ArrayLike) → ArrayLike

earthkit.meteo.thermo.specific_gas_constant(q: xarray.DataArray) → xarray.DataArray

earthkit.meteo.thermo.specific_gas_constant(q: earthkit.data.FieldList) → earthkit.data.FieldList

Compute the specific gas constant of moist air.

Specific content of cloud particles and hydrometeors are neglected.

Parameters:

q (number or array-like) – Specific humidity (kg/kg)

Returns:

Specific gas constant of moist air (J kg-1 K-1)

Return type:

number or array-like

The computation is based on the following formula:

\[R = R_{d} + (R_{v} - R_{d}) q\]

where:

• \(R_{d}\) is the gas constant for dry air (see earthkit.meteo.constants.Rd)

• \(R_{v}\) is the gas constant for water vapour (see earthkit.meteo.constants.Rv)

Implementations

specific_gas_constant() calls one of the following implementations depending on the type of the input arguments:

• earthkit.meteo.thermo.array.specific_gas_constant() for array-like

• earthkit.meteo.thermo.xarray.specific_gas_constant() for xarray.DataArray

• earthkit.meteo.thermo.fieldlist.specific_gas_constant() for FieldList

The function returns an object of the same type as the input arguments.