Vegetation Radiative Transfer Modelling (Nadine Gobron) - PEER

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Basic Processes (1) Scattering “A physical process by which an ensemble of particles immerged into an electromagnetic radiation field remove energy from the incident waves to re-irradiate this energy into other directions” Absorption “A physical process by which an ensemble of particles immerged into an electromagnetic radiation field remove energy from the incident waves to convert this energy in a different form” Extinction “A physical process by which an ensemble of particles immerged into an electromagnetic radiation field remove energy from the incident waves to attenuate the energy of this incident wave” 10
Basic Processes (2) •The upward and downward intensities change along the vertical coordinate z in the medium according to the volumetric (individual cross-sections times the number per unit volume) coefficients of absorption, K (in m -1 ) and scattering S (in m -1 ) •Thus 1/S (1/K) have dimensions of length and may be interpreted as the absorption (scattering) mean free paths, i.e. the average distance between absorption (scattering) events. z=0 I (z) I (z+Δz) I (z) I (z+Δz) z z+Δz z=z h 11
Page 1 and 2: Radiative Transfer Modeling …. ov
Page 3 and 4: Satellites have different “eyes
Page 5 and 6: Model of radiation transfer • Sin
Page 7 and 8: Outline • Radiative Transfer Equa
Page 9: • The system under consideration
Page 13 and 14: Conservation of radiant energy for
Page 15 and 16: Asymmetry factor for scattering pro
Page 17 and 18: Single scattering albedo ↓ ∂I (
Page 19 and 20: Two-stream equations • In a more
Page 21 and 22: Extension to N Flux (2) In the limi
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Page 27 and 28: Discrete canopy: 1D representation
Page 29 and 30: Vegetation ‘Optical Depth’ •
Page 31 and 32: ~ Extinction coefficient σ ( z, Ω
Page 33 and 34: Leaf Orientations Vegetation foliag
Page 35 and 36: Leaf scattering properties • Leaf
Page 37 and 38: Canopy scattering phase function
Page 39 and 40: •When the radiation is scattered
Page 41 and 42: Separation of Scattering Order ρ (
Page 43 and 44: I 0 ↑ (H, Ω, Ω 0 ) = 1 π γ s
Page 45 and 46: Uncollided BRF in Principal Plan So
Page 47 and 48: Uncollided BRF in Cross Plan Solar
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Page 51 and 52: Single Collided BRF in Principal Pl
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Overview of MISR Ref: http://www-mi
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Bidirectional Reflectance Factor at
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Fraction of Absorbed Photosynthetic
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JRC-FAPAR products Equivalent phys
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Ground-based Estimations • Three
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Vegetation Radiative Transfer Modelling (Nadine Gobron) - PEER

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