Section 3
Chapter 2,292

Absorption profiles of shortwave radiation in a vegetation canopy

Kuusk, A.

Agricultural and Forest Meteorology 62(3-4): 191-204


ISSN/ISBN: 0168-1923
DOI: 10.1016/0168-1923(92)90014-u
Accession: 002291347

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Absorption profiles of incoming solar radiation determine incoming fluxes between vegetation-covered ground and the atmosphere. On the basis of the Nilson-Kuusk canopy reflectance model a procedure for calculating the absorption profiles inside a homogeneous vegetation canopy is proposed. The model considers the absorption of uncollided and single-scattered radiation including specular reflection on leaves and the hot-spot effect. Multiple scattering is considered in a two-stream approach. Model calculations demonstrate significant deviations of absorption profiles from an exponential distribution in the near-IR spectral region and high dependence of profiles on foliage orientation and the solar zenith angle. The set of input parameters of the model coincides with that of the Nilson-Kuusk canopy reflectance model. These parameters can be estimated from remote measurements of the angular distribution of canopy directional reflectance.

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