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- Author or Editor: M. Griggs x
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Abstract
Measurements of the atmospheric aerosol optical thickness were made during the 1977 EOMET cruise across the Atlantic Ocean and the Mediterranean Sea. These data were obtained at the same time as NOAA 5 and GOES visible radiance measurements in the vicinity of the ship. Linear relationships between the upwelling radiance and the aerosol optical thickness were found for each satellite, confirming earlier Landsat results. Differences in the relationships for each satellite are attributed to differences in the radiometric calibrations of the satellite sensors.
Abstract
Measurements of the atmospheric aerosol optical thickness were made during the 1977 EOMET cruise across the Atlantic Ocean and the Mediterranean Sea. These data were obtained at the same time as NOAA 5 and GOES visible radiance measurements in the vicinity of the ship. Linear relationships between the upwelling radiance and the aerosol optical thickness were found for each satellite, confirming earlier Landsat results. Differences in the relationships for each satellite are attributed to differences in the radiometric calibrations of the satellite sensors.
Abstract
Aircraft measurements of the albedo of stratus clouds were made, with the results suggesting, on occasion, that the liquid water content of the cloud has a stronger influence than the cloud thickness on the albedo. The mean cloud absorption was found to be 4% of the incident downward flux. Albedos of other surfaces (ocean, forest, grass, desert, snow and ice) generally agreed with measurements by other authors.
Abstract
Aircraft measurements of the albedo of stratus clouds were made, with the results suggesting, on occasion, that the liquid water content of the cloud has a stronger influence than the cloud thickness on the albedo. The mean cloud absorption was found to be 4% of the incident downward flux. Albedos of other surfaces (ocean, forest, grass, desert, snow and ice) generally agreed with measurements by other authors.
Abstract
Calculations of the downward and upward fluxes of solar radiation have been programmed for computer use, so that these fluxes may he readily determined for any given set of conditions such as albedo, altitude and sun angle. These calculations, which show good agreement with other models, were graphically compared with aircraft measurements using a specially designed homograph.
Analysis of this comparison suggests that aerosols above 18,000 ft were producing an average attenuation of about 80% in the downward solar flux during the flight program.
Abstract
Calculations of the downward and upward fluxes of solar radiation have been programmed for computer use, so that these fluxes may he readily determined for any given set of conditions such as albedo, altitude and sun angle. These calculations, which show good agreement with other models, were graphically compared with aircraft measurements using a specially designed homograph.
Analysis of this comparison suggests that aerosols above 18,000 ft were producing an average attenuation of about 80% in the downward solar flux during the flight program.
Abstract
A ground-based infrared spectroradiometer has been used to measure the vertical temperature profile of the lower atmosphere from 0 to 6 km. Eight measurements in the 15-μm carbon dioxide band have been used for the inversion in addition to three measurements in the 18-μm water vapor band for the water vapor corrections. One additional observation in the 11-μm window region is used to determine the presence of cloud. Twenty-one sets of clear sky data obtained in the summer of 1971 are used to verify the inversion technique. The resultant profiles have an accuracy comparable to that of radiosondes with an overall rms error of 1.58°C.
Abstract
A ground-based infrared spectroradiometer has been used to measure the vertical temperature profile of the lower atmosphere from 0 to 6 km. Eight measurements in the 15-μm carbon dioxide band have been used for the inversion in addition to three measurements in the 18-μm water vapor band for the water vapor corrections. One additional observation in the 11-μm window region is used to determine the presence of cloud. Twenty-one sets of clear sky data obtained in the summer of 1971 are used to verify the inversion technique. The resultant profiles have an accuracy comparable to that of radiosondes with an overall rms error of 1.58°C.
