MeTo (version 0.1.1)

Rso: Clear-sky solar radiation (Rso)

Description

Clear-sky solar radiation for daily and shorter periods.

Usage

Rso(
  x,
  lat.rad = NULL,
  lat.deg = NULL,
  long.deg = NULL,
  elev,
  tl,
  control = list(Lz = 345)
)

Arguments

x

date-time object or day of the year (must be date-time object if calculation period is shorter than a day)

lat.rad

latitude [rad]. Use either lat.rad or lat.deg. Latitude is positive for the northern and negative for the southern hemisphere

lat.deg

latitude [degree]. Use either lat.deg or lat.rad. Latitude is positive for the northern and negative for the southern hemisphere

long.deg

longitude of the measurement site (degrees east of Greenwich) (only needed for periods < 1 day)

elev

station elevation above sea level [m]

tl

length of calculation period [hour] (1 for hourly period, 0.5 for a 30-minute period or 24 for daily period).

control

list for control parameters and empirical factors defined in controlDefaults and constDefaults (see Details)

Details

References

eq. 37; 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).

Examples

# NOT RUN {
# --------------------------------------------
#  Daily period
# --------------------------------------------

Rso(x = 135, elev = 1, lat.deg = -22.9)

# --------------------------------------------
#  Hourly period
# --------------------------------------------

Rso(x = as.POSIXct('2018-10-01 12:30'), tl = 1, elev = 8, lat.deg = 16.2,
    long.deg = 343.75, control = list(Lz = 15))

# }