VARIATIONS OF SATELLITE DAYTIME RADIATION DATA WITH VIEWING GEOMETRY.
Scientific rept. no. 3,
STANFORD RESEARCH INST MENLO PARK CALIF
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Data obtained from the solar-reflectance channels of TIROS III are examined for a region which was scanned twice within a few minutes as a result of a change in the scanning mode of the radiometer. The data analyses indicate that signals received for scattering angles of 60 to 70 degrees are significantly stronger than those for the angles of 130 to 160 degrees. The difference between albedos for these two ranges of scattering angle was largest for an area of relatively clear skies. The variation of albedo with the scattering angle was more pronounced for the broad solar channel than for the visible channel. Potential limb effects for partly cloudy sky are estimated in terms of cloudiness, effective temperature, and albedo. Atmospheric effects are neglected. It is shown that effective temperatures from an ideal infrared window could decrease by more than 5 degrees Kelvin, while the albedos from a solar-reflectance channel increase by more than 10 percent for a typical increase 40 degrees in the radiometric nadir angle of a scan pattern. Author