earthkit.meteo.thermo.fieldlist.relative_humidity_from_specific_humidity¶

earthkit.meteo.thermo.fieldlist.relative_humidity_from_specific_humidity(t, q, p=None)¶

Compute the relative humidity from specific humidity.

Parameters:

t (FieldList|Field) – Temperature (K).
q (FieldList|Field) – Specific humidity (kg/kg).
p (FieldList|Field|Iterable[float]|float|None) – Pressure (Pa). If None, inferred from the field metadata of t. Otherwise, if t is a FieldList p must be a FieldList or an array-like of the same length as t. If t is a Field, p must be a single Field or a float.

Returns:

Relative humidity (%). The result has the same type as the input t and q (FieldList or Field).

Return type:

FieldList|Field

The computation is based on the following formula:

\[r = 100 \frac {e(q, p)}{e_{msat}(t)}\]

where:

\(e\) is the vapour pressure (see vapour_pressure_from_specific_humidity())

\(e_{msat}\) is the saturation_vapour_pressure() based on the “mixed” phase