'es' calculates mean saturation vapour pressure based on air temperature.
Usage
es(Tmax,Tmin)
Arguments
Tmax
Vector of length n containing daily maximum temperature [C].
Tmin
Vector of length n containing daily minumum temperature [C].
Value
Vector of length n of mean saturation vapour pressure [kPa]
References
Allen, R.G., L.S. Pereira, D. Raes, and M. Smith. 1998. Crop Evapotranspiration: Guidelines for computing crop water requirements. Irrigation and Drainage Paper 56, Food and Agriculture Organization of the United Nations, Rome, pp. 300.