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  • 1980-1984  (3)
  • 1
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    A fast, exact code for scattered thermal radiation compared with a two-stream approximation (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A two-stream accuracy study for internally (thermal) driven problems is presented by comparison with a recently developed 'exact' adding/doubling method. The resulting errors in external (or boundary) radiative intensity and flux are usually larger than those for the externally driven problems and vary substantially with the radiative parameters. Error predictions for a specific problem are difficult. An unexpected result is that the exact method is computationally as fast as the two-stream approximation for nonisothermal media.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 43; July 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Assessment of the visibility impairment caused by the emissions from the proposed power plant at Boron, California (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The current atmospheric conditions and visibility were modeled, and the effect of the power plant effluent was then added to determine its influence upon the prevailing visibility; the actual reduction in visibility being a function of meteorological conditions and observer-plume-target geometry. In the cases investigated, the perceptibility of a target was reduced by a minimum of 10 percent and a maximum of 100 percent. This significant visual impact would occur 40 days per year in the Edwards area with meteorological conditions such as to cause some visual impact 80 days per year.
    Keywords: ENVIRONMENT POLLUTION
    Type: NASA-CR-163103 , SAI-181-EF80-156 , H-1143
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Calculation of multiple scattered radiation in clean atmospheres (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Calculations of the multiple-scattered solar radiation in the earth's atmosphere are compared with telephotometer measurements of the sky intensity obtained during the EPA-sponsored Visibility Impairment by Sulfate Transport and Transformation in the Atmosphere experiment. The doubling and adding calculation technique, in which the reflection and transmission properties of the atmosphere are computed by initially calculating such properties for the case of very thin layers and then adding adjacent layers together, is described and compared with data for two cloudless sky conditions. The first is typical of clean tropospheric conditions, and the second represents an ultraclean atmosphere in which surface aerosol scattering is much lower than molecular scattering. Good agreement is found between the computations and the measurement data.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Joint Conference on Applications of Air Pollution Meteorology; Mar 24, 1980 - Mar 27, 1980; New Orleans, LA
    Format: text
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    NASA TECHNICAL REPORTS
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