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  • Other Sources  (6)
  • 1975-1979  (6)
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  • 1
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    Optical measurement in the middle atmosphere (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The paper describes the optical measurement of atmospheric trace gases by outlining various sensing techniques and general problems encountered in remote or in situ optical measurement. The review encompasses discussions of observational approaches, geometry and platforms, instrumentation, atmospheric absorption bands, and some analyses of observed data. Some future global experiments, including Nimbus G, Spacelab I, HALOE, and MAPS, are briefly discussed.
    Keywords: GEOPHYSICS
    Type: Pure and Applied Geophysics; 117; 3, 19; 1978-197
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Pressure sensing of the atmosphere by solar occultation using broadband CO2 absorption (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A technique for obtaining pressure at the tangent point in an IR solar occulation experiment is described. By measuring IR absorption in bands of atmospheric CO2 (e.g., 2.0, 2.7, or 4.3 microns), mean pressure values for each tangent point layer (vertical thickness 2 km or less) of the atmosphere can be obtained with rms errors of less than 3%. The simultaneous retrieval of pressure and gas concentration in a remote-sensing experiment will increase the accuracy of inverted gas concentrations and minimize the dependence of the experiment on pressure or mass path error resulting from use of climatological pressure data, satellite ephemeris, and instrument pointing accuracy.
    Keywords: OPTICS
    Type: Applied Optics; 18; June 15
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Atlas of Infrared Absorption Lines (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: This atlas of infrared absorption line contains absorption line parameters (line strength vs. wavenumber) from 500 to 7000 cm(exp-1) for 15 gases: H2O, CO2, O3, N2O, CO, CH4, O2, SO2, NO, NO2, NH3, HCl, HF, HNO3 and CH3Cl.
    Keywords: Environment Pollution
    Type: NASA-CR-2925
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Pressure sensing of the atmosphere by solar occultation - An application to remote sensing of atmospheric minor gases (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The simultaneous inference of pressure and gas concentration in a remote-sensing experiment will increase the accuracy of inverted gas concentrations and minimize the dependence of the experiment on pressure or mass-path error resulting from use of climatological pressure data, satellite ephemeris, and instrument pointing accuracy. A technique for obtaining tangent-point pressure information needed for inversion of gas concentration in an IR solar occultation experiment is described. By measuring IR absorption in bands of atmospheric CO2 (e.g., 2.0, 2.7, or 4.3 microns) pressure values for each layer (2 km or less in the vertical) of the atmosphere can be obtained with rms errors of less than 3%.
    Keywords: GEOPHYSICS
    Type: In: Joint Conference on Sensing of Environmental Pollutants; Nov 06, 1977 - Nov 11, 1977; New Orleans, LA
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Global monitoring of stratospheric halogen compounds from a satellite using gas filter spectroscopy in the solar occultation mode (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: ENVIRONMENT POLLUTION
    Type: Applied Optics; 16; Mar. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    ATMOS Spacelab 1 science investigation (1979)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Existing infrared spectra from high speed interferometer balloon flights were analyzed and experimental analysis techniques applicable to similar data from the ATMOS experiment (Spacelab 3) were investigated. Specific techniques under investigation included line-by-line simulation of the spectra to aid in the identification of absorbing gases, simultaneous retrieval of pressure and temperature profiles using carefully chosen pairs of CO2 absorption lines, and the use of these pressures and temperatures in the retrieval of gas concentration profiles for many absorbing species. A search for a new absorption features was also carried out, and special attention was given to identification of absorbing gases in spectral bandpass regions to be measured by the halogen occultation experiment.
    Keywords: GEOPHYSICS
    Type: NASA-TM-80465
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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