TY - JOUR
T1 - NEW LOOK AT THE DISCRETE ORDINATE METHOD FOR RADIATIVE TRANSFER CALCULATIONS IN ANISOTROPICALLY SCATTERING ATMOSPHERES - 2. INTENSITY COMPUTATIONS.
AU - Stamnes, Knut
AU - Dale, Henri
PY - 1981
Y1 - 1981
N2 - The recently developed matrix method to solve the discrete ordinate approximation to the radiative transfer equation in plane parallel geometry is extended to compute the full azimuthal dependence of the intensity. Comparing computed intensities with those obtained by other established methods, it is found that for phase functions typical of atmospheric haze 32 streams are sufficient for better than 1% agreement, while 16 streams yield an accuracy of about 1-5% except for angles close to the forward and backward directions for which the error is about 10-15%. The results of the intensity computations are summarized by presenting three-dimensional ″stack plots″ of the intensity as a function of polar and azimuthal angles. It is shown that for flux calculations four streams suffice to obtain 1% accuracy, while eight streams yield an accuracy better than 0. 1%.
AB - The recently developed matrix method to solve the discrete ordinate approximation to the radiative transfer equation in plane parallel geometry is extended to compute the full azimuthal dependence of the intensity. Comparing computed intensities with those obtained by other established methods, it is found that for phase functions typical of atmospheric haze 32 streams are sufficient for better than 1% agreement, while 16 streams yield an accuracy of about 1-5% except for angles close to the forward and backward directions for which the error is about 10-15%. The results of the intensity computations are summarized by presenting three-dimensional ″stack plots″ of the intensity as a function of polar and azimuthal angles. It is shown that for flux calculations four streams suffice to obtain 1% accuracy, while eight streams yield an accuracy better than 0. 1%.
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U2 - 10.1175/1520-0469(1981)038<2696:ANLATD>2.0.CO;2
DO - 10.1175/1520-0469(1981)038<2696:ANLATD>2.0.CO;2
M3 - Article
AN - SCOPUS:0019665963
SN - 0022-4928
VL - 38
SP - 2696
EP - 2706
JO - Journal of the Atmospheric Sciences
JF - Journal of the Atmospheric Sciences
IS - 12
ER -