earthkit.meteo.thermo.wet_bulb_temperature_from_dewpoint

earthkit.meteo.thermo.wet_bulb_temperature_from_dewpoint(t: ArrayLike, td: ArrayLike, p: ArrayLike, ept_method: str = 'ifs', t_method: str = 'bisect') → ArrayLike
earthkit.meteo.thermo.wet_bulb_temperature_from_dewpoint(t: xarray.DataArray, td: xarray.DataArray, p: xarray.DataArray, ept_method: str = 'ifs', t_method: str = 'bisect') → xarray.DataArray
earthkit.meteo.thermo.wet_bulb_temperature_from_dewpoint(t: earthkit.data.FieldList, td: earthkit.data.FieldList, p: earthkit.data.FieldList, ept_method: str = 'ifs', t_method: str = 'bisect') → earthkit.data.FieldList

Compute the pseudo adiabatic wet bulb temperature from dewpoint.

Parameters:

  • t (number or array-like) – Temperature (K)

  • td (number or array-like) – Dewpoint (K)

  • p (number or array-like) – Pressure (Pa)

  • ept_method (str, optional) – Specifies the computation method for the equivalent potential temperature. The possible values are: “ifs”, “bolton35”, “bolton39”. (See ept_from_dewpoint() for details.)

  • t_method (str, optional) –

    Specifies the method to find the temperature along the moist adiabat defined by the equivalent potential temperature. The possible values are as follows:

Returns:

Wet bulb temperature (K)

Return type:

number or array-like

The computation is based on Normand’s rule [Wallace2006] (Chapter 3.5.6):

  • first the equivalent potential temperature is computed with the given ept_method (using ept_from_dewpoint()). This defines the moist adiabat.

  • then the wet bulb potential temperature is determined as the temperature at pressure p on the moist adiabat with the given t_method.

Implementations

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

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