earthkit.meteo.thermo.xarray.mixing_ratio_from_dewpoint¶
- earthkit.meteo.thermo.xarray.mixing_ratio_from_dewpoint(td, p)¶
Compute the mixing ratio from dewpoint.
- Parameters:
td (
xarray.DataArray) – Dewpoint (K)p (
xarray.DataArray) – Pressure (Pa)
- Returns:
Specific humidity (kg/kg)
- Return type:
xarray.DataArray
The computation starts with determining the vapour pressure:
\[e(w, p) = e_{wsat}(td)\]where:
\(e\) is the vapour pressure (see
vapour_pressure_from_mixing_ratio())\(e_{wsat}\) is the
saturation_vapour_pressure()over water\(w\) is the mixing ratio
Then w is computed from \(e\) using
mixing_ratio_from_vapour_pressure().