dot-get_Sr: S_r: longwave re-radiation (W / m^2)

Description Usage Arguments Details Value References Examples

Description

S_r: longwave re-radiation (W / m^2)

Usage

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.get_Sr(T_leaf, pars)

Arguments

T_leaf

Leaf temperature in Kelvin

pars

Concatenated parameters (leaf_par, enviro_par, and constants)

Details

S_r = 2 σ α_l T_air ^ 4

The factor of 2 accounts for re-radiation from both leaf surfaces (Foster and Smith 1986).

Symbol R Description Units Default
α_l abs_l absorbtivity of longwave radiation (4 - 80 μm) none 0.97
T_air T_air air temperature K 298.15
σ s Stefan-Boltzmann constant W / (m^2 K^4) 5.67e-08

Note that leaf absorbtivity is the same value as leaf emissivity

Value

Value in W / m^2 of class units

References

Foster JR, Smith WK. 1986. Influence of stomatal distribution on transpiration in low-wind environments. Plant, Cell \& Environment 9: 751-9.

Examples

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library(tealeaves)

cs <- make_constants()
ep <- make_enviropar()
lp <- make_leafpar()

T_leaf <- set_units(298.15, K)

tealeaves:::.get_Sr(T_leaf, c(cs, ep, lp))

cdmuir/tealeaves documentation built on June 21, 2020, 2:32 a.m.