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  • EARTH RESOURCES AND REMOTE SENSING  (2)
  • OPTICS  (1)
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  • 1
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    Infrared radiation emerging from smoke produced by brush fires (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The IR radiative transport properties of brush fire smoke clouds, computed for a model with finite horizontal dimensions as well as the more common plane-parallel model, are presented. The finite model is a three-dimensional version of the two-stream approximation applied to cubic clouds of steam, carbon, and silicates. Assumptions are made with regard to the shape and size distributions of the smoke particles. It is shown that 11.5-micron radiometry can detect fires beneath smoke clouds if the path integrated mass density of the smoke is less than or equal to 3 g/sq m.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Applied Optics; 20; Jan. 15
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Infrared radiative transfer through a regular array of cuboidal clouds (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Infrared radiative transfer through a regular array of cuboidal clouds is studied and the interaction of the sides of the clouds with each other and the ground is considered. The theory is developed for black clouds and is extended to scattering clouds using a variable azimuth two-stream approximation. It is shown that geometrical considerations often dominate over the microphysical aspects of radiative transfer through the clouds. For example, the difference in simulated 10 micron brightness temperature between black isothermal cubic clouds and cubic clouds of optical depth 10, is less than 2 deg for zenith angles less than 50 deg for all cloud fractions when viewed parallel to the array. The results show that serious errors are made in flux and cooling rate computations if broken clouds are modeled as planiform. Radiances computed by the usual practice of area-weighting cloudy and clear sky radiances are in error by 2 to 8 K in brightness temperature for cubic clouds over a wide range of cloud fractions and zenith angles. It is also shown that the lapse rate does not markedly affect the exiting radiances for cuboidal clouds of unit aspect ratio and optical depth 10.
    Keywords: OPTICS
    Type: NASA-TM-82123
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    11.5 micron emission from smokes computed using finite cloud geometry (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This study presents the infrared radiative transport properties of smoke produced by brush fires under conditions when the smoke is confined to a finite horizontal area and the usual plane parallel model for radiative transfer in an absorbing and scattering medium may not be valid. The transport model is a three-dimensional version of the two-stream approximation applied to finite cuboidal clouds of water, carbon and silicates with known optical properties; assumptions are made regarding the particle size distribution of the polydispersion.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: ASME PAPER 80-WA/HT-1 , Winter Annual Meeting of the American Society of Mechanical Engineers; Nov 16, 1980 - Nov 21, 1980; Chicago, IL
    Format: text
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    NASA TECHNICAL REPORTS
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