earthkit.meteo.thermo.fieldlist.dewpoint_from_relative_humidity

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

Compute the dewpoint temperature from relative humidity.

Parameters:

• t (FieldList|Field) – Temperature (K).

• r (FieldList|Field) – Relative humidity (%).

Returns:

Dewpoint temperature (K). For zero r values returns nan. The result has the same type as the input t and r (FieldList or Field).

Return type:

FieldList|Field

The computation starts with determining 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().