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  • Other Sources  (3)
  • METEOROLOGY AND CLIMATOLOGY  (3)
  • 1980-1984  (3)
  • 1982  (3)
  • 1
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    Cloud top remote sensing by airborne lidar (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Observations of cloud top height, backscattering, and signal depolarization have been obtained by a lidar system operating onboard a high-altitude research aircraft. The transmitter for the cloud lidar system is a doubled Nd:YAG laser operating at 5 Hz. The system functions as a fully automated sensor under microprocessor control and operates from a nominal 19-km altitude. Measurements have been acquired over a wide variety of cloud cover in conjunction with passive visible and infrared measurements. Initial observation results are reported
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Applied Optics; 21; May 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    An iterative radiative transfer code for ocean-atmosphere systems (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The details of an iterative radiative transfer code for computing the intensity and degree of polarization of diffuse radiation in models of the ocean-atmosphere system are described. The present code neglects the upwelling radiation from below the ocean surface and as such can be applied to the part of the spectrum where the absorption by water is strong. To establish the reliability of the numerical scheme and the computer code, the results are compared with those of Fraser and Walker (1968), Dave (1972), and Mullamaa (1964); they are found to be in excellent agreement. The computations also show that both the intensity and the degree of polarization of the upwelling diffuse radiation at the top of the atmosphere vary significantly when the rough ocean at the base of the atmosphere is replaced by a Lambertian surface that reflects the same energy as the rough ocean.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Journal of the Atmospheric Sciences; 39; Mar. 198
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    NASA TECHNICAL REPORTS
  • 3
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    Satellite measurements of cloud reflectance and optical thickness (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The cloud reflectance and the optical thickness have been computed with the aid of atmospheric models from the first eleven months (April 1970-February 1971) of backscattered ultraviolet (BUV) data over the Pacific Ocean. Both the cloud and the optical thickness are derived from the 380 nm channel by assuming that the entire IFOV (200 km) is filled by stratiform clouds. The analysis shows a large variability in the cloud reflectance in both the intertropic conversion zone (ITCZ) and the high latitudes. It is also found that for 90 percent of the time in the tropics, the clouds have an optical thickness of less than 10. An analysis of clouds with optical thickness between 10 and 20 shows that in the tropics the minimum frequency coincides with the dry zone at 2.5 deg S and the maximum frequency for clouds of optical thickness 10-20 is greater in summer than in winter and irrespective of the season; 50 percent of the time the clouds have an optical thickness less than 13.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: (ISSN 0273-1177)
    Format: text
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    NASA TECHNICAL REPORTS
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