Long wave radiation regime in vegetation-parameterisations for climate research

摘要: Abstract An analytical and mathematical model that describes the long wave radiation regime inside a vegetation canopy was developed. The assumptions are: leaves are only elements arranged in horizontally infinite layers: they evenly spread layers; having random azimuthal direction defined zenithal direction. Leaves absorb all thermal radiation, do not scatter any emit isotropic radiation. adaptation of `View factor' concept exchanges between leaf layers. calculated amount irradiance incident on single tilted from flat surface (like ground). It found for an isothermal emitting surface, with both sides absorbing identically, leaf's tilt angle does influence impinging it. Then exchanged by two nearby layers reaching layer evaluated. Next, `layer attenuation coefficient', `emission coefficient layer' calculated. Finally, plane parallel transfer equation fluxes radiance is presented. concluded infinite, homogeneous erect leaves, outside penetrates into deeper less released to surroundings, than case. From this point view better suited cold climates.