earthkit.meteo.thermo.array.dewpoint_from_relative_humidity

earthkit.meteo.thermo.array.dewpoint_from_relative_humidity(t, r)

Compute the dewpoint temperature from relative humidity.

Parameters:

• t (array-like) – Temperature (K)

• r (array-like) – Relative humidity (%)

Returns:

Dewpoint temperature (K). For zero r values returns nan.

Return type:

array-like

The computation starts with determining the the saturation vapour pressure over water at the dewpoint temperature:

\[e_{wsat}(td) = \frac{r e_{wsat}(t)}{100}\]

where:

• \(e_{wsat}\) is the saturation_vapour_pressure() over water

• \(td\) is the dewpoint.

Then \(td\) is computed from \(e_{wsat}(td)\) by inverting the equations used in saturation_vapour_pressure().