varwg.meteo.meteox2y.psychro2e

varwg.meteo.meteox2y.psychro2e(t_dry, t_wet, p=None)

Vapour pressure from dry and wet temperature from Assmann psychrometer using Sprung’s [1] formula (as seen on wikipedia)

Parameters:

t_dryfloat or np.array of floats

dry temperature [deg C]

t_wetfloat or np.array of floats

wet temperature [deg C]

pfloat or np.array of floats or None, optional

air pressure [hPa], if None: use the simplified version of the formula, default is None

Returns:

efloat or np.array of floats

vapour pressure [hPa]

Notes

If p is None, a simplification is used which can be used below 500m above sea level

References

[1]

Sprung, A.: Ueber die Bestimmung der Luftfeuchtigkeit mit Hilfe des Assmannschen Aspirationspsychrometers, Z. Angew. Meteorol., Das Wetter, 5 (1888), S. 105?108

Examples

>>> psychro2e(np.array([17.5,18.9]),np.array([12.3,12.1]))
array([10.82619823,   9.56701424])

>>> p = np.array([800,800])
>>> psychro2e(np.array([17.5,18.9]),np.array([12.3,12.1]),p=p)
array([11.57630294,  10.54309631])