pyet.radiation.turc

pyet.radiation.turc(tmean, rs, rh, k=0.013, clip_zero=True)

Potential evapotranspiration calculated according to Turc (1961).

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].

• rh (pandas.Series or xarray.DataArray) – mean daily relative humidity [%].

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

• clip_zero (bool, optional) – if True, replace all negative values with 0.

Returns:

Potential evapotranspiration [mm d-1].

Return type:

pandas.Series or xarray.DataArray containing the calculated

Examples

>>> pet_turc = turc(tmean, rs, rh)

Notes

Based on equation S9.10 and S9.11 in McMahon et al. (2013).

\[PET=k(\frac{T_{mean}}{T_{mean}+15})(23.88R_s+50)0.013; for RH>50\]

\[PET=k(1+\frac{50-RH}{70})(\frac{T_{mean}}{T_{mean}+15}) (23.88R_s+50)0.013; for RH<50\]