S_r: longwave re-radiation (W / m^2)
Leaf temperature in Kelvin
Concatenated parameters (
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).
|α_l|| ||absorbtivity of longwave radiation (4 - 80 μm)||none||0.97|
|T_air|| ||air temperature||K||298.15|
|σ|| ||Stefan-Boltzmann constant||W / (m^2 K^4)||5.67e-08|
Note that leaf absorbtivity is the same value as leaf emissivity
Value in W / m^2 of class
Foster JR, Smith WK. 1986. Influence of stomatal distribution on transpiration in low-wind environments. Plant, Cell \& Environment 9: 751-9.
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