geocat.comp.crop.actual_saturation_vapor_pressure(tdew, tfill=nan)

Compute ‘actual’ saturation vapor pressure [kPa] as described in the Food and Agriculture Organization (FAO) Irrigation and Drainage Paper 56 entitled:

Crop evapotranspiration - Guidelines for computing crop water requirement. Specifically, see equation 14 of Chapter 3.

The dew point temperature is synonymous with the wet bulb temperature.

Note that this function is the same as saturation_vapor_pressure, but with temperature = dew point temperature with different metadata


asvp – the computed actual saturation vapor pressure in kPa. Same shape as tdew.

Return type

numpy.ndarray, xarray.DataArray


>>> import numpy as np
>>> from geocat.comp import actual_saturation_vapor_pressure
>>> temp = np.array([50, 60, 70])
>>> actual_saturation_vapor_pressure(temp)
array([1.22796262, 1.76730647, 2.50402976])

See also

Related GeoCAT Functions: saturation_vapor_pressure, saturation_vapor_pressure_slope

Related NCL Functions: satvpr_tdew_fao56