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Radiation Transfer Modeling


Difference between model simulated spectra by the benchmark model and fast radiative transfer model as a function of wavelength for a cirrus cloud case; a thick cloud case and an aerosol case. (Duan, Min and Li2005)

A new Successive order of Scattering model for solving Vector Radiative Transfer in Atmosphere (VSOS)

A full vector radiative transfer code for plane-parallel atmosphere is developed by using the successive order of scattering method. An exponent-linear assumption is used in the vertical integration, and fast analytical expansion of Fourier decomposing is introduced into the code. Further, three symmetric relations are used, resulting ~75% computations saves in Fourier decomposition of scattering phase matrix. This fast VSOS has been applied to various remote sensing algorithms.

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An adjoint formulation of the radiative transfer method

Radiaitive transfer problems may be solved "adjointly" from an observed exicdent radiance flux dsitbution backward to the incident fluxes. We have developed an adjoint formulation based on the discrete ordinate radiative transfer method, with application to atmospheric radiative transfer, including effects of the surface albedo. The adjoint method is comparably accurate and markedly faster, which can be used for various remote sensing algorithms.

We are also developping our own radiation transfer models to favor particular needs:

A semi-analytic technique to speed up SOS model for optically thick media (2004)

A fast radiative transfer model for simulating high-resolution absorption bands (2005)

A Soil-Vegetation-Atmosphere coupled microwave radiation transfer model (under construction)