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  • 1
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    A model for simulating random atmospheres as a function of latitude, season, and time (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An empirical stochastic computer model was developed with the capability of generating random thermodynamic profiles of the atmosphere below an altitude of 99 km which are characteristic of any given season, latitude, and time of day. Samples of temperature, density, and pressure profiles generated by the model are statistically similar to measured profiles in a data base of over 6000 rocket and high-altitude atmospheric soundings; that is, means and standard deviations of modeled profiles and their vertical gradients are in close agreement with data. Model-generated samples can be used for Monte Carlo simulations of aircraft or spacecraft trajectories to predict or account for the effects on a vehicle's performance of atmospheric variability. Other potential uses for the model are in simulating pollutant dispersion patterns, variations in sound propagation, and other phenomena which are dependent on atmospheric properties, and in developing data-reduction software for satellite monitoring systems.
    Keywords: GEOPHYSICS
    Type: NASA-TN-D-8470 , L-11308
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    The Development of a Stochastic Model of the Atmosphere Between 30 and 90 Km to Be Used in Determining the Effect of Atmospheric Variability on Space Shuttle Entry Parameters (1973)
    In:  CASI
    Details
    Publication Date: 2019-08-14
    Description: A stochasitc model of the atmosphere between 30 and 90 km was developed for use in Monte Carlo space shuttle entry studies. The model is actually a family of models, one for each latitude-season category as defined in the 1966 U.S. Standard Atmosphere Supplements. Each latitude-season model generates a pseudo-random temperature profile whose mean is the appropriate temperature profile from the Standard Atmosphere Supplements. The standard deviation of temperature at each altitude for a given latitude-season model was estimated from sounding-rocket data. Departures from the mean temperature at each altitude were produced by assuming a linear regression of temperature on the solar heating rate of ozone. A profile of random ozone concentrations was first generated using an auxiliary stochastic ozone model, also developed as part of this study, and then solar heating rates were computed for the random ozone concentrations.
    Keywords: GEOPHYSICS
    Type: NASA-TM-X-69567
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Ozone Trend Detectability (1981)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The detection of anthropogenic disturbances in the Earth's ozone layer was studied. Two topics were addressed: (1) the level at which a trend in total ozoning is detected by existing data sources; and (2) empirical evidence in the prediction of the depletion in total ozone. Error sources are identified. The predictability of climatological series, whether empirical models can be trusted, and how errors in the Dobson total ozone data impact trend detectability, are discussed.
    Keywords: GEOPHYSICS
    Type: NASA-CP-2189 , L-14654 , Jul 28, 1977 - Jul 29, 1977; Boulder, CO; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Flow properties of submerged heated effluents in a waterway. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An experimental and theoretical investigation has been undertaken to study the trajectory and growth of thermal effluents having a range of discharge velocities and temperatures. The discharge of an effluent into a waterway was mathematically modeled as a submerged jet injection process by using an integral method which accounts for natural fluid mechanisms such as turbulence, entrainment, buoyancy, and heat transfer. The effects of these mechanisms on the jet properties are examined along with the effects of nonuniformity in the free-stream velocity and temperature fields. The results are supported by experimental data and demonstrate the usefulness of the theory for estimating the location, size, and temperature of the thermal plume.
    Keywords: GEOPHYSICS
    Type: AIAA PAPER 72-79 , American Institute of Aeronautics and Astronautics, Aerospace Sciences Meeting; Jan 17, 1972 - Jan 19, 1972; San Diego, CA
    Format: text
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    NASA TECHNICAL REPORTS
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