Discrete spherical harmonics method for radiative transfer in scalar planar inhomogeneous atmosphere

2018 ◽  
Vol 35 (7) ◽  
pp. 1081 ◽  
Author(s):  
Romuald Tapimo ◽  
Hervé Thierry Tagne Kamdem ◽  
David Yemele
Keyword(s):  
Radiative Transfer ◽  
Spherical Harmonics ◽  
Inhomogeneous Atmosphere

SHDOMPPDA: A Radiative Transfer Model for Cloudy Sky Data Assimilation

2007 ◽  
Vol 64 (11) ◽  
pp. 3854-3864 ◽  
Author(s):  
K. Franklin Evans
Keyword(s):  
Radiative Transfer ◽  
Data Assimilation ◽  
Spherical Harmonics ◽  
Forward Model ◽  
Radiative Transfer Model ◽  
Computational Time ◽  
Transfer Model ◽  
Discrete Ordinate Method ◽  
Discrete Ordinate ◽  
Plane Parallel

Abstract The spherical harmonics discrete ordinate method for plane-parallel data assimilation (SHDOMPPDA) model is an unpolarized plane-parallel radiative transfer forward model, with corresponding tangent linear and adjoint models, suitable for use in assimilating cloudy sky visible and infrared radiances. It is derived from the spherical harmonics discrete ordinate method plane-parallel (SHDOMPP, also described in this article) version of the spherical harmonics discrete ordinate method (SHDOM) model for three-dimensional atmospheric radiative transfer. The inputs to the SHDOMPPDA forward model are profiles of pressure, temperature, water vapor, and mass mixing ratio and number concentration for a number of hydrometeor species. Hydrometeor optical properties, including detailed phase functions, are determined from lookup tables as a function of mass mean radius. The SHDOMPP and SHDOMPPDA algorithms and construction of the tangent-linear and adjoint models are described. The SHDOMPPDA forward model is validated against the Discrete Ordinate Radiative Transfer Model (DISORT) by comparing upwelling radiances in multiple directions from 100 cloud model columns at visible and midinfrared wavelengths. For this test in optically thick clouds the computational time for SHDOMPPDA is comparable to DISORT for visible reflection, and roughly 5 times faster for thermal emission. The tangent linear and adjoint models are validated by comparison to finite differencing of the forward model.

A finite element-spherical harmonics model for radiative transfer in inhomogeneous clouds

2004 ◽  
Vol 72 (1-4) ◽  
pp. 223-237 ◽  
Author(s):  
P.A. Cook ◽  
C.R.E. de Oliveira ◽  
J.D. Haigh ◽  
A.J. Goddard
Keyword(s):  
Finite Element ◽  
Radiative Transfer ◽  
Spherical Harmonics
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