ET0_Penman_Monteith_FAO_netcdf: Compute daily reference evapotranspiration for a netCDF...

In rijaf-iri/CDT: Climate Data Tools

Compute daily reference evapotranspiration for a netCDF dataset.

Description

Function to compute daily reference evapotranspiration using the FAO Penman-Monteith equation.

Usage

ET0_Penman_Monteith_FAO_netcdf(
  start.date = "1991-01-01",
  end.date = "2020-12-31",
  tmax.data = list(dir = "", format = "tmax_%s%s%s.nc", varid = "tmax", ilon = 1, ilat
    = 2),
  tmin.data = list(dir = "", format = "tmin_%s%s%s.nc", varid = "tmin", ilon = 1, ilat
    = 2),
  rh.from = "minmax",
  rhmax.data = list(dir = "", format = "rhmax_%s%s%s.nc", varid = "rhmax", ilon = 1,
    ilat = 2),
  rhmin.data = list(dir = "", format = "rhmin_%s%s%s.nc", varid = "rhmin", ilon = 1,
    ilat = 2),
  rhmean.data = list(dir = "", format = "rhmean_%s%s%s.nc", varid = "rhmean", ilon =
    1, ilat = 2),
  wff10.data = list(dir = "", format = "wff_%s%s%s.nc", varid = "wsp", ilon = 1, ilat
    = 2),
  pres.data = list(dir = "", format = "pres_%s%s%s.nc", varid = "pres", ilon = 1, ilat
    = 2),
  rad.data = list(dir = "", format = "rad_%s%s%s.nc", varid = "rad", ilon = 1, ilat =
    2),
  elev.data = list(file = "", varid = "z", ilon = 1, ilat = 2),
  output = list(dir = "", format = "et0_%S.nc")
)

Arguments

start.date	character, the start date of the data to be calculated in the form YYYY-MM-DD.
end.date	character, the end date of the data to be calculated in the form YYYY-MM-DD.
tmax.data	named list, providing the maximum temperature netCDF dataset. Units: degree Celsius. dir: character, full path to the directory containing the netCDF files. format: character, format of the netCDF file names varid: character, name of the variable to read from the netCDF data ilon: integer, order for the longitude dimension of the variable. Example: if the variable "pres" has the dimension order [Lat, Lon] then ilon must be 2 ilat: integer, order for the latitude dimension of the variable.
tmin.data	named list, providing the minimum temperature netCDF dataset. Units: degree Celsius. See tmax.data for the elements of the list.
rh.from	character, source of relative humidity data. Valid options: "minmax" and "mean". "minmax": the humidity data are from the minimum and maximum relative humidity. "mean": the humidity data is from a mean relative humidity data.
rhmax.data	named list, if rh.from is equal to "minmax", providing the maximum relative humidity netCDF dataset. Units: percentage. See tmax.data for the elements of the list.
rhmin.data	named list, if rh.from is equal to "minmax", providing the minimum relative humidity netCDF dataset. Units: percentage. See tmax.data for the elements of the list.
rhmean.data	named list, if rh.from is equal to "mean", providing the mean relative humidity netCDF dataset. Units: percentage. See tmax.data for the elements of the list.
wff10.data	named list, providing the wind speed at 10 meters netCDF dataset. Units: m/s. See tmax.data for the elements of the list.
pres.data	named list, providing the surface pressure netCDF dataset. Units: hPa. See tmax.data for the elements of the list.
rad.data	named list, providing the solar radiation flux netCDF dataset. Units: W/m^2. See tmax.data for the elements of the list.
elev.data	named list, providing the Digital Elevation Model in netCDF format. Units: meters. file: character, full path to the netCDF file containing the elevation data. varid: character, name of the variable to read from the netCDF data. ilon: integer, order for the longitude dimension of the variable. ilat: integer, order for the latitude dimension of the variable.
output	named list, the elements of the list are dir: character, full path to the directory to save the calculated reference evapotranspiration format: character, format of the output netCDF file names, the dates are represented by %S

References

Allen, R.G., Pereira, L.S., Raes, D., and Smith, M. 1998. Crop evapotranspiration: Guidelines for computing crop requirements. Irrigation and Drainage PaperNo. 56, FAO, Rome, Italy 300 p. https://www.fao.org/3/X0490E/x0490e00.htm

rijaf-iri/CDT documentation built on July 3, 2024, 2:54 a.m.