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  • INSTRUMENTATION AND PHOTOGRAPHY  (2)
  • Atmospheric trace gases  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Differences in the concentrations of atmospheric trace gases in and above the tropical boundary layer (1981)
    Springer
    Pure and applied geophysics 119 (1981), S. 990-997 
    Details
    ISSN: 1420-9136
    Keywords: Atmospheric trace gases ; Atmospheric chemistry ; Chemical composition of atmospheric boundary layer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Weekly air samples were collected at Cape Kumakahi (0 km) and at nearby Mauna Loa Observatory (3.4 km) which is above the boundary layer. EC/GC and GC/FID techniques were used to measure CH3I, CHCl3, CO and CH4, which are largely natural in origin, and C2Cl4, CCl4, CH3, CCl3, CCl3F (F-11), CCl2F2 (F-12), CHClF2 (F-22) and C2F3Cl3 (F-113), which are due to anthropogenic activities. It was found that all these gases are significantly (α≤0.05) more abundant in the boundary layer than above it.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00878964
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    Paper (German National Licenses)
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  • 2
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    An intercomparison of carbon monoxide measurement techniques (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Results from an intercomparison of techniques to measure tropospheric levels of carbon monoxide (CO) are discussed. The intercomparison was conducted as part of the National Aeronautics and Space Administration's Global Tropospheric Experiment (GTE) and was held at Wallops Island, VA, in July 1983. Instruments intercompared included a laser differential absorption method and three grab sample/gas chromatograph methods. The intercomparison consisted of simultaneous measurements of ambient levels of CO and controlled injections of CO from a common manifold. Results from the techniques exhibited a high degree of correlation among themselves and with changes in the CO mixing ratio. The results suggested a level of agreement among the techniques of about 15 percent. However, a day-to-day bias between the techniques was observed, which resulted in differences between techniques as large as 38 percent.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Journal of Geophysical Research (ISSN 0148-0227); 90; 12
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    N2O analysis in the atmosphere via electron capture-gas chromatography (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The potential of commercially available pulse-modulated electron capture detector (ECD)-equipped gas chromatographs for direct measurement of ambient levels of N2O is assessed. Since the sensitivity of ECD to N2O is directly proportional to the detector operating temperature and detector standing current, it is necessary to use a 'hot' ECD (250-350 C). The method is shown to be very precise with a standard error not exceeding 1% for automated analysis of ambient air samples. The technology is available to permit highly accurate routine direct analysis of N2O in the troposphere and stratosphere. Both captured air samples or direct real-time measurement from research vessels or airborne platforms are possible.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Geophysical Research Letters; 3; Oct. 197
    Format: text
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    NASA TECHNICAL REPORTS
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