A Geometric Ultraviolet-B Radiation Transfer Model Applied to Vegetation Canopies

A Geometric Ultraviolet-B Radiation Transfer Model Applied to Vegetation Canopies

Many radiative transfer models for the shortwave band have been developed and used to understand and The decrease in stratospheric ozone (O3 ) has prompted continued simulate the radiation environment of vegetative canoefforts to assess the potential damage to plant and animal life due to enhanced levels of solar ultraviolet (UV)-B (280–320 nm) radiation. pies. Smith (1983), Goel (1988), and My...

Radiative Transfer in Vegetation Canopies

Stochastic Modeling of Radiation Regime in Discontinuous Vegetation Canopies

A stochastic radiative transfer equation for the mean l( → X), cosine of polar angle of direction → X d( → X2 → X0), Dirac delta function field and its solution for the case of discontinuous vegetation canopies is discussed in this article. The equation set v(→r ), indicator function Fdir(k), extraterrestrial solar radiance at the top of satisfies the law of energy conservation and is amenable ...

Modeling Radiative Transfer in Heterogeneous 3-D Vegetation Canopies

T h e DART (discrete anisotropic radiative transfer) model simulates radiative transfer in heterogeneous 3-D scenes that may comprise different landscape features; i.e., leaves, grass, trunks, water, soil. The scene is divided into a rectangular cell matrix, i.e., building block for simulating larger scenes. Cells are parallelipipedic. Their optical properties are represented by individual scat...

14 Three-Dimensional Radiative Transfer in Vegetation Canopies

Interaction of photons with a host medium is described by a linear transport equation. This equation has a very simple physical interpretation; it is a mathematical statement of the energy conservation law. In spite of the different physics behind radiation transfer in clouds and vegetation, these media have certain macro and micro-scale features in common. First, both are characterized by stro...