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  • GEOPHYSICS  (4)
  • ENVIRONMENT POLLUTION
  • PROPULSION SYSTEMS
  • 1980-1984  (4)
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  • 1
    Publication Date: 2011-08-19
    Description: Laboratory tests were performed to quantify the expected NO(x) production by lightning and biological processes. Attention was focused on energy deposition by lightning and the oxygen partial pressure of soil, and one-dimensional photochemical models were defined for the tropospheric distributions of NO and HNO3 for various NO source strengths. The Lightning Facility data were compared with air samples of N2O production gathered during over 2 yr of flights through storms. Soil NO(x) productions were studied in terms of nitrification processes involving Nitrosomonas europaea and Alcaligenes faecalis bacteria, which change ammonium to nitrite and release NO and N2O as byproducts. The results indicate that atmospheric NO(x) is generated at two tropospheric levels, with lightning and soil bacteria being significant contributors.
    Keywords: GEOPHYSICS
    Type: Atmospheric Environment (ISSN 0004-6981); 18; 9, 19
    Format: text
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  • 2
    Publication Date: 2011-08-17
    Description: Laser heterodyne spectroscopy (LHS) techniques were used to measure radical gases from Spacelab. Major emphasis was placed on the measurement of ClO, ClOnO2, HO2, H2O2, N2O5, and HOCl in solar occultation with vertical resolution less than or equal to 2-km and vertical range from 1O to 70-km. Sensitivity analyses were performed on ClO and O3 to determine design criteria for the LHS instrument. Results indicate that O3 and ClO vertical profiles can be measured with an accuracy more than or equal to 95% and more than or equal to 80%, respectively, over the total profile.
    Keywords: GEOPHYSICS
    Type: High Resolution Infrared Spectry. Tech. for Upper Atmospheric Meas.; p 55-79
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  • 3
    Publication Date: 2019-07-13
    Description: A tunable diode laser heterodyne radiometer was developed for ground-based measurements of atmospheric solar absorption spectra in the 8 to 12 microns spectral range. The performance and operating characteristics of this Tunable Infrared Heterodyne Radiometer (TIHR) are discussed along with atmospheric solar absorption spectra of HNO3, O3, CO2, and H2O in the 9 to 11 microns spectral region.
    Keywords: GEOPHYSICS
    Type: NASA-TP-1726 , L-13877 , Heterodyne Systems and Technol. Conf.; Mar 25, 1980 - Mar 27, 1980; Williamsburg, VA; United States
    Format: application/pdf
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  • 4
    Publication Date: 2019-07-13
    Description: Ammonia possesses a unique position in the terrestrial atmosphere in that it is the only gaseous basic constituent. Ammonia readily forms aerosols, and by virtue of its high solubility controls the pH of cloud droplets and precipitation. Over the past year a ground-based solar viewing Infrared Heterodyne Radiometer has been used at Langley Research Center to infer the vertical distribution of ammonia. Ground level in situ measurements of ammonia have also been obtained to supplement the profile data. The ammonia profiles have been analyzed and interpreted with a one-dimensional photochemical model of the troposphere to assess the sources and sinks of NH3.
    Keywords: GEOPHYSICS
    Type: AIAA PAPER 81-0376 , Aerospace Sciences Meeting; Jan 12, 1981 - Jan 15, 1981; St. Louis, MO
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