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Fast analytical two-stream radiative transfer methods for horizontally homogeneous vegetation media

Otto, Sebastian and Trautmann, Thomas (2008) Fast analytical two-stream radiative transfer methods for horizontally homogeneous vegetation media. Other. Other. Selbstverlag.

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Official URL: http://www.uni-leipzig.de/~meteo/ORGA/LIM_Bd_42.pdf

Abstract

This work reports on the two-stream radiative transfer in a horizontally homogeneous turbid vegetation medium assuming bi-Lambertian leaf scattering by planar model leaves. The deduced two-stream radiative transport equations are solved analytically for various leaf architectures considering leaf normal distribution (LND) functions from purely vertical to purely horizontal leaves. These transfer models are driven by radiative energy flux densities (EFDs) incident at the top of the vegetation (TOV) and separated into their diffuse and direct fractions, used as upper boundary conditions. The radiance field is treated as approximately isotropic, but its zenithal distribution can be varied by the so-called diffusivity factor, which allows together with the incident EFDs at TOV to take the sky conditions above the canopy into account. Simulations of the canopy reflectance and transmittance are performed in the UV/VIS as function of the solar zenith angle and the ratio of the direct and diffuse sky light above the canopy representing clear and overcast sky conditions. These computations demonstrate that the radiative transfer in vegetation is significantly influenced by this ratio and the LND of the leaves.

Document Type:Monograph (Other, Other)
Title:Fast analytical two-stream radiative transfer methods for horizontally homogeneous vegetation media
Authors:
AuthorsInstitution or Email of Authors
Otto, SebastianUNSPECIFIED
Trautmann, ThomasUNSPECIFIED
Date:2008
Refereed publication:No
Volume:42
Number of Pages:16
Editors:
EditorsEmail
Raabe, ArminUNSPECIFIED
Publisher:Selbstverlag
Series Name:Wissenschaftliche Mitteilungen aus dem Institut für Meteorologie der Universität Leipzig
ISBN:978-3-9811114-2-2
Status:Published
Keywords:turbid vegetation medium, G-function, radiative transfer, two-stream approximation, diffuse light
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Transport System
DLR - Research area:Transport
DLR - Program:V VS - Verkehrssystem
DLR - Research theme (Project):V - Mittel- und langfristige Entwicklung der Personenverkehrsnachfrage (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Atmospheric Processors
Deposited By: Sebastian Otto
Deposited On:19 Jan 2009
Last Modified:12 Dec 2013 20:36

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