An approximate expression of the sky radiance in almucantar and its application |
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| Authors: | Qiu Jinhuan |
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| Institution: | Institute of Atmospheric Physics, Academia Sinica, Beijing |
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| Abstract: | An approximate expression of the sky radiance in almucantar is confirmed in this paper. Under the conditions, with molecular
optical depth<0.3, aerosol (or cloud) optical depth<0.6, solar zeith angle<75° and scattering angle<30°, the errors of the
sky radiance and the aerosol phase function computed from the expression are respectively less than 8% and 10%, but the phase
functions computed from Box-Deepak formula and single—scattering formula can be 84% and 260% more than the exact value respectively.
Furthermore, by use of the expression, we have inferred the volume scattering functions of 1°≤θ≤30° for retrieving aerosol
size distribution with the conclusion that the distribution information in the range of 0.1<r<15μm can be accaurately obtained from the scattering channels of 1°≤θ≤30°. |
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