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  • GEOPHYSICS  (3)
  • 1980-1984  (3)
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  • 1
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    Satellite mission analysis (1980)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Keywords: GEOPHYSICS
    Type: NASA, Washington Upper Atmosphere Res. Program; p 217-218
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Simulation of the earth's monthly average regional radiation balance derived from satellite measurements (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Computer simulations of satellite-derived earth radiation parameters are used to determine the source and size of errors arising from measuring parameters over 1 month on a 2.5 deg x 2.5 deg longitude-latitude grid. November 1979 GOES data are used as a source of radiation parameter fields within each region. A mathematical model is given for the data-processing algorithms that are used to produce daily, monthly, and monthly hourly estimates of shortwave, longwave and net radiant exitance. Resulting retrieval errors are found to be due to insufficient knowledge of the temporal distribution of measurements. These errors, in combination with similar sampling errors produce biases in monthly net radiant exitance which are complex, regionally-dependent functions of the local time of the measurements. The 40 region standard errors of estimate for three satellites ranged from 2 to 3 W per sq. m., while single satellite errors ranged from 5 to 19 W per sq. m. A three-satellite system is therefore recommended to reduce biases.
    Keywords: GEOPHYSICS
    Type: Journal of Climate and Applied Meteorology (ISSN 0733-3021); 23; 392-403
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Comparison of longwave diurnal models applied to simulations of the Earth Radiation Budget Experiment (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The Earth Radiation Budget Experiment (ERBE) is a multisatellite experiment which is to be implemented in the mid 1980s. The experiment involves a utilization of instruments on one or more sun-synchronous satellites in the NOAA series, and the employment of a dedicated spacecraft, the ERBS, in a 57 deg orbit. One of the objectives of ERBE is related to an improvement of knowledge regarding the diurnal variability in the earth's radiation balance. In the present investigation, satellite samples of longwave (LW) radiation over land are simulated for both sun-synchronous and non-sun-synchronous orbits. Three different LW diurnal models are then applied to the sampled data, and the resulting modeled monthly net LW radiant exitances are compared against reference values based on complete hourly sampling of the area for a month. The results demonstrate the general usefulness of a trigonometric diurnal LW model for land regions with daytime heating trends.
    Keywords: GEOPHYSICS
    Type: Journal of Climate and Applied Meteorology (ISSN 0733-3021); 23; 155-160
    Format: text
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    NASA TECHNICAL REPORTS
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