earthkit.meteo.thermo.xarray.specific_humidity_from_dewpoint¶
- earthkit.meteo.thermo.xarray.specific_humidity_from_dewpoint(td, p)¶
Compute the specific humidity 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:
\[e(q, p) = e_{wsat}(td)\]where:
\(e\) is the vapour pressure (see
vapour_pressure_from_specific_humidity())\(e_{wsat}\) is the
saturation_vapour_pressure()over water\(q\) is the specific humidity
Then q is computed from \(e\) using
specific_humidity_from_vapour_pressure().