potential.radiation: Potential radiation

In bigleaf: Physical and Physiological Ecosystem Properties from Eddy Covariance Data

Potential radiation

Description

Compute potential radiation for given geolocation and day of year.

Usage

potential.radiation(doy, hour, latDeg, longDeg, timezone, useSolartime = TRUE)

Arguments

doy	Integer vector with day of year (start at 1), same length as hour or length 1.
hour	Numeric vector with daytime as decimal hour of local time zone
latDeg	Latitude (decimal degrees)
longDeg	Longitude (decimal degrees)
timezone	Time zone (hours)
useSolartime	by default corrects hour (given in local winter time) for latitude to solar time (where noon is exactly at 12:00). Set this to FALSE to directly use local winter time.

Value

vector of potential radiation (W m-2)

Examples

hour <- seq(5, 18, by = 0.1)
potRadApparentLocal <- potential.radiation(
  160, hour, 39.94, -5.77, timezone = +1)
potRadTimezone <- potential.radiation(
  160, hour, 39.94, -5.77, timezone = +1, useSolartime = FALSE)
plot(potRadApparentLocal ~ hour, type = 'l'
  , ylab = 'potential radiation (W m-2)')
lines(potRadTimezone ~  hour, col = "blue")
abline(v = 12, col = "blue", lty = "dotted")
legend("bottomright", legend = c("solar time", "local winter time")
, col = c("black", "blue"), inset = 0.05, lty = 1)

bigleaf documentation built on Aug. 22, 2022, 9:09 a.m.