pyet.meteo_utils.calc_psy

pyet.meteo_utils.calc_psy(pressure, tmean=None)

Psychrometric constant [kPa °C-1].

Parameters:

• pressure (array_like) – atmospheric pressure [kPa].

• tmean (array_like) – average day temperature [°C].

Returns:

• array_like containing the Psychrometric

• constant [kPa °C-1].

Examples

>>> psy = calc_psy(pressure, tmean)

Notes

if tmean is none:

Based on equation 8 in Allen et al. (1998).

elif rh is None:

From FAO (1990), ANNEX V, eq. 4.