Mean saturation vapour pressure [kPa] for short time intervals less than a day. Calculated with air temperature.
saturation vapour pressure at air temperature [kPa/degreeC])
eq. 11 of the reference
for day, week, decade or month, the mean saturation vapour pressure should be computed with
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).
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