Summary of the Article on Canopy Radiative Transfer:

## Canopy Radiative Transfer

The article describes the calculation of radiative transfer within vegetative canopies using the two-stream approximation. Key points:

### Radiative Transfer Equations
- Equations (2.3.1) and (2.3.2) provide the governing equations for upward and downward diffuse radiative fluxes in the canopy.
- The optical parameters (G, μ̄, ω, β, β₀) are calculated based on the work of Sellers (1985).

### Optical Property Calculations
- Leaf and stem reflectance and transmittance properties are used to determine the scattering coefficients ω, ωβ, and ωβ₀.
- The upscatter parameters β and β₀ are calculated based on the mean leaf inclination angle.
- Equations are provided to calculate the upward and downward direct beam and diffuse fluxes through the canopy.

### Partitioning Absorbed Radiation
- Absorbed radiation is partitioned between sunlit and shaded fractions of the canopy using an analytical solution.
- Equations are provided to calculate the absorbed direct beam and diffuse radiation for sunlit and shaded leaves.

### Parameters and Properties
- Optical properties for different plant functional types and intercepted snow are provided in tables.
- The article references several sources for the derivation and implementation of the radiative transfer scheme.

In summary, the article presents the detailed calculations involved in modeling the radiative transfer within a vegetative canopy, including the governing equations, optical property derivations, and partitioning of absorbed radiation between sunlit and shaded leaves.