geocat.comp.meteorology.actual_saturation_vapor_pressure

geocat.comp.meteorology.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

Parameters:

• tdew (numpy.ndarray, xarray.DataArray, list, float) – Dew point temperatures in Fahrenheit

• tfill (float, nan, optional) – An optional parameter for a fill value in the return value

Returns:

asvp (numpy.ndarray, xarray.DataArray) – the computed actual saturation vapor pressure in kPa. Same shape as tdew.

Examples

>>> 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