pyet.radiation.abtew

pyet.radiation.abtew(tmean, rs, k=0.53, clip_zero=True)

Potential evapotranspiration calculated according to Abtew (1996).

Parameters:

• tmean (pandas.Series or xarray.DataArray) – average day temperature [°C].

• rs (pandas.Series or xarray.DataArray) – incoming solar radiation [MJ m-2 d-1].

• k (float, optional) – calibration coefficient [-].

• 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_abtew = abtew(tmean, rs)

Notes

Based on equation 14 in Xu and Singh (2000).

\[PE = \frac{k R_s}{\lambda}\]