pyet.radiation.makkink

pyet.radiation.makkink(tmean, rs, pressure=None, elevation=None, k=0.65, clip_zero=True)

Potential evapotranspiration calculated according to Makkink (1957).

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].

• pressure (pandas.Series or xarray.DataArray, optional) – atmospheric pressure [kPa].

• elevation (float/xarray.DataArray, optional) – the site elevation [m].

• k (float, optional) – calirbation 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_mak = makkink(tmean, rs, elevation=elevation)

Notes

\[PET = \frac{0.65 \Delta (R_s)}{\lambda(\Delta +\gamma)}\]