canlw: Calculates longwave radiation underneath vegetated canopies

In ilyamaclean/microctools: Various worker functions for microclimc package

Calculates longwave radiation underneath vegetated canopies

Description

canlw calculates the flux density (W / m^2) of incoming and outgoing longwave radiation underneath vegetated canopies

Usage

canlw(tc, l, ref = 0.03, skyem = 0.9, clump = 0)

Arguments

tc	temperature (deg C)
l	leaf area index
ref	average leaf reflectivity in longwave spectrum (1 - thermal emissivity)
skyem	sky emissivity
clump	clumpiness factor for canopy (0-1, see details)

Value

A list wiht the following elements:

lwout Flux density of total outgoing longwave radiation emitted under leaf area l (W / m2)

lwin Flux density of incoming longwave radiation received under leaf area l (W / m2)

lwabs Flux density of absorbed longwave radiation under leaf area l (W / m2)

lwnet Flux density of net longwave radiation emitted under leaf area l (W / m2)

Examples

l <- c(0:1000) / 500
lw1 <- canlw(11, l, skyem = 0.9)
lw2 <- canlw(11, l, skyem = 0.7)
lw3 <- canlw(11, l, skyem = 0.5)
plot(lw1$lwnet ~ l, type = "l", lwd = 2, ylim = c(0,200), ylab = "Net longwave")
par(new = TRUE)
plot(lw2$lwnet ~ l, type = "l", col = "blue", lwd = 2, ylim = c(0,200), ylab = "")
par(new = TRUE)
plot(lw3$lwnet ~ l, type = "l", col = "red", lwd = 2, ylim = c(0,200), ylab = "")

ilyamaclean/microctools documentation built on Jan. 25, 2023, 5:29 a.m.