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  • J NO 2  (2)
  • LASERS AND MASERS  (1)
  • temperature effect  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Measurement of the photodissociation coefficient of NO2 in the atmosphere: I. Method and surface measurements (1983)
    Springer
    Journal of atmospheric chemistry 1 (1983), S. 3-25 
    Details
    ISSN: 1573-0662
    Keywords: J NO 2 ; NO2 photolysis ; atmospheric photochemistry ; J NO 2measurement
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract An instrument, specifically designed for measurements from a balloon platform in the stratosphere, has been used to obtain ground-level values of the atmospheric photodissociation coefficient of nitrogen dioxide, J NO 2.A typical clear-sky value is 8.0×10-3 s-1 when the solar zenith angle is 40°. Measurements were made as a function of solar zenith angle and correlated with a calibrated Eppley UV radiometer. It is shown that J NO 2may be expressed as a simple function of the radiometer output so that estimates of J NO 2can be made using just an upward looking radiometer to an accuracy of about 20%. The measurements are also found to be in good agreement with calculations of J NO 2using a simplified isotropic multiple scattering computer routine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00113977
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Calculations of the temperature dependence of the NO2 photodissociation coefficient in the atmosphere (1984)
    Springer
    Journal of atmospheric chemistry 1 (1984), S. 151-157 
    Details
    ISSN: 1573-0662
    Keywords: Atmosphere ; photolysis ; nitrogen dioxide ; photodissociation coefficient ; temperature effect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract The photodissociation coefficient, J NO2 of NO2 in the atmosphere was calculated at 235 and 298 K using the measured temperature dependences of the absorption cross-sections and quantum yields. These calculations gave a ratio J NO2(298 K)/J NO2(235 K)=1.155±0.010 which is only weakly dependent on altitude, surface albedo and solar zenith angle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00053837
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  • 3
    Electronic Resource
    Electronic Resource
    Measurement of the photodissociation coefficient of NO2 in the atmosphere: II, stratospheric measurements (1985)
    Springer
    Journal of atmospheric chemistry 3 (1985), S. 233-245 
    Details
    ISSN: 1573-0662
    Keywords: J NO 2 ; NO2 photolysis ; atmospheric photochemistry ; J NO 2 measurement
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract The photodissociation coefficient of NO2, J NO 2, has been measured from a balloon platform in the stratosphere. Results from two balloon flights are reported. High Sun values of J NO 2 measured were 10.5±0.3 and 10.3±0.3×10-3 s-1 at 24 and 32 km respectively. The decrease in J NO 2 at sunset was monitored in both flights. The measurements are found to be in good agreement with calculations of J NO 2 using a simplified isotropic multiple scattering computer routine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00210498
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  • 4
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    A tunable diode laser system for aircraft measurements of trace gases (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The advantages of tunable-diode-laser absorption spectrometry (TDLAS) for measuring trace atmospheric gases are universality, positive identification, good sensitivity, and rapid response time. A TDLAS system is described which is capable of making measurements aboard an aircraft. The instrument was employed during the Chemical Instrumentation Test and Evaluation (CITE) 2 program to measure NO2 on 11 flights and HNO3 on five flights. Detection limits were determined to be 25 parts per trillion by volume (pptv) for NO2 and 75 pptv for HNO3 with response times of 3 min. This was sufficient to permit measurements of NO2 in the free troposphere and HNO3 in the continental boundary layer a significant fraction of the time.
    Keywords: LASERS AND MASERS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 95; 10147-10
    Format: text
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