psyc_cons | R Documentation |
The psychrometric constant [kPa/degreeC]
psyc_cons(elev, P = NULL, control = list())
elev |
elevation [m] |
P |
atmospheric pressure [kPa] |
control |
list for control parameters and empirical factors
defined in |
Tko: reference temperature [degreeC] at elevation z0. Only needed if atmospheric pressure is missing.
Often assumed to be 20 degreeC
elev: station elevation above sea level [m]. Needed if P = NULL for estP
lambda: latent heat of vaporization [MJ/kg]
eps: ratio molecular weight of water vapor/dry air = 0.622
cp: specific heat of moist air = 1.013 x 10-3 [MJ/(kg degreeC)]
psychrometric constant [kPa/degreeC]
eq. 8 of reference
Allen, R. G., Pereira, L. S., Raes, D., & Smith, M. (1998). Crop evapotranspiration-Guidelines for computing crop water requirements-FAO Irrigation and drainage paper 56. FAO, Rome, 300(9).
psyc_cons(elev = 2, P = 101.3)
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