cal_ET0_from_PM_for_daily {simET}

Calculating reference evapotranspiration from Penman-Monteith for daily

Description

Based on lat, z, J, Tmax, Tmin, n, RHmax, RHmin, windSpeed parameters, reference evapotranspiration was calculated by Penman-Monteith.

Usage

cal_ET0_from_PM_for_daily(Latitude, Altitude, J, Tmax, Tmin, Rs, RHmean, Wind)

Arguments

Latitude

latitude (radian), positive for the northern hemisphere and negative for the southern hemisphere.

Altitude

station elevation above sea level [m].

J

is the number of the day in the year between 1 (1 January) and 365 or 366 (31 December).

Tmax

daily maximum air temperature (degrees Celsius).

Tmin

daily minimum air temperature (degrees Celsius).

Rs

Solar radiation [MJ m-2 d-1].

RHmean

daily mean relative humidity %.

Wind

wind speed at 2 m height [m s-1].

Value

A vector for reference evapotranspiration (mm/day)

References

Allen, R. G., Pereira, L. S., Raes, D., & Smith, M. FAO Irrigation and drainage paper No. 56. Rome: Food and Agriculture Organization of the United Nations, 1998.

Examples

 library(simET)
 data("FIalfalfa")
 names(FIalfalfa)
 Result_data<- dplyr::mutate(FIalfalfa,
                      ET0=cal_ET0_from_PM_for_daily(Latitude=Latitude,
                                                   Altitude=Altitude,
                                                   J=Julian,
                                                   Tmax=Tmax,
                                                   Tmin=Tmin,
                                                   Rs=Rs,
                                                   RHmean=RHmean,
                                                   Wind=Wind))
 names(Result_data)