Description Usage Arguments Value References
View source: R/vapour_functions.R
Calculates the psychrometric constant for a given elevation based on Equation 7 and 8 in Allen et al. (1998).
1 2 3 4 5 6 7 | psychrometric_constant(
z,
atmp = NULL,
lambda = 2.45,
cp = 0.001013,
epsilon = 0.622
)
|
z |
elevation above sea level (m) |
atmp |
air temperature (degrees C). Optional value used to calculate the latent heat of vaporization. Defaults to NULL to use constant value of lambda. |
lambda |
latent heat of vaporization (MJ/kg). Default is 2.45. |
cp |
specific heat at constant pressure (MJ/kg/degC). Default is 1.1013e-3. |
epsilon |
ratio molecular weight of water vapour/dry air (-). Default is 0.622 |
gamma |
the psychrometric constant for the given elevation (kPa/degrees C) |
Allen, R. G., Pereira, L. S., Raes, D., & Smith, M. (1998). Crop evapotranspiration: Guidelines for computing crop water requirements. Rome: FAO. Retrieved from http://www.fao.org/docrep/X0490E/x0490e00.htm.
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