pyet.radiation.fao_24#
- pyet.radiation.fao_24(tmean, wind, rs, rh, pressure=None, elevation=None, albedo=0.23, clip_zero=True)[source]#
Potential evapotranspiration calculated according to Jensen et al. (1990).
- Parameters:
tmean (pandas.Series or xarray.DataArray) – average day temperature [°C].
wind (pandas.Series xarray.DataArray) – mean day wind speed [m/s].
rs (pandas.Series xarray.DataArray) – incoming solar radiation [MJ m-2 d-1].
rh (pandas.Series or xarray.DataArray) – mean daily relative humidity [%].
pressure (pandas.Series or xarray.DataArray, optional) – atmospheric pressure [kPa].
elevation (float/xarray.DataArray, optional) – the site elevation [m].
albedo (float/xarray.DataArray, optional) – surface albedo [-].
clip_zero (bool, optional) – if True, replace all negative values with 0.
- Returns:
pandas.Series or xarray.DataArray containing the calculated potential
evapotranspiration [mm d-1].
Examples
>>> pet_fao24 = fao_24(tmean, wind, rs, rh, elevation=elevation)
\[PE = \frac{- 0.3 \Delta + R_s (1-\alpha) w} {\lambda(\Delta +\gamma)}\]\[w = 1.066-0.13*\frac{rh}{100}+0.045*u_2-0.02*\frac{rh}{100} *u_2-3.15*(\frac{rh}{100})^2-0.0011*u_2\]