vp_act_mean: Vapour pressure, mean actual

Description Usage Arguments Value References

View source: R/vapour_functions.R

Description

Calculates the mean actual vapour pressure for an hourly, daily, or larger time period based on Equations 17 and 54 of Allen et al. (1998).

Usage

1
vp_act_mean(atmp, RH)

Arguments

atmp

air temperature (degrees C). When dt is "daily" or larger, argument should be a list with elements "min" and "max" for daily min and max temperatures. When dt is "hourly", argument should be a vector with hourly recorded temperatures.

RH

relative humidity (percent). When dt is "daily" or larger, argument should be a list with elements "min" and "max" for daily min and max relative humidities. When dt is "hourly", argument should be a vector with hourly recorded relative humidities.

Value

ea

mean actual vapour pressure (kPa) during time period of interest (hourly or daily timestep)

References

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.


WDNR-Water-Use/CSLSevap documentation built on April 9, 2021, 1:35 a.m.