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  • ENVIRONMENT POLLUTION  (2)
  • atmospheric photochemistry  (2)
  • broadening coefficient  (1)
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  • 1
    facet.materialart.
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    Measurements of tropospheric nitric acid over the Western United States and Northeastern Pacific Ocean (1990)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Over 240 measurements of nitric acid (HNO3) were made in the free troposphere as well as in the boundary layer. Marine HNO3 measurement results were strikingly similar to results from GAMETAG and other past atmospheric field experiments. The marine boundary layer HNO3 average, 62 parts-per-trillion by volume (pptv), was 1/3 lower than the marine free tropospheric average, 108 pptv, suggesting that the boundary layer is a sink for tropospheric nitric acid, probably by dry deposition. Nitric acid measurements on a nighttime continental flight gave a free tropospheric average of 218 pptv, substantially greater than the daytime continental free tropospheric 5-flight average of 61 pptv. However, the nighttime results may be influenced by highly convective conditions that existed from thunderstorms in the vicinity during that night flight. The continental boundary layer HNO3 average of 767 pptv is an order of magnitude greater than the free tropospheric average, indicating that the boundary layer is a source of free tropospheric HNO3. The distribution of continental boundary layer HNO3 data, from averages of 123 over rural Nevada and Utah to 1057 pptv in the polluted San Joaquin Valley of California suggest a close tie between boundary layer HNO3 and anthropogenic activity.
    Schlagwort(e): ENVIRONMENT POLLUTION
    Materialart: NASA-TM-103470 , NAS 1.15:103470
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 2
    facet.materialart.
    Unbekannt
    In situ measurements of nitric oxide, water vapour and ozone from an aircraft (1974)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: This paper describes flight tests of prototype instruments for the NASA global atmospheric sampling program (GASP). Three gas sampling instruments were included in the installation: (1) a chemiluminescent nitric oxide monitor; (2) an ultraviolet absorption ozone monitor; and (3) an aluminum oxide water vapor hygrometer. Results indicate the range and kind of variability in NO, H2O, and O3 that can be expected in routine tropospheric air sampling. They have also demonstrated the need for increasing instrument sensitivities, particularly in NO measurement.
    Schlagwort(e): ENVIRONMENT POLLUTION
    Materialart: International Conference on the Environmental Impact of Aerospace Operations in the High Atmosphere; Jul 08, 1974 - Jul 10, 1974; San Diego, CA
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 3
    Digitale Medien
    Digitale Medien
    The effect of water vapour broadening on methane eddy correlation flux measurements (1991)
    Springer
    Journal of atmospheric chemistry 13 (1991), S. 97-108 
    Details
    ISSN: 1573-0662
    Schlagwort(e): Methane flux ; broadening coefficient ; eddy correlation technique
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Geologie und Paläontologie
    Notizen: Abstract A high resolution tunable diode laser absorption spectrometer (TDLAS) was used to measure the broadening effect of water vapor and other gases (dry air, nitrogen, oxygen, hydrogen and helium) on three methane lines in the v4 fundamental. The effects on methane eddy correlation flux measurements amount to a few percent for the least broadened line for expected H2O fluxes, to ≈10% for the most broadened line for higher H2O and lower CH4 fluxes likely to be encountered. The broadening coefficients of methane measured for air, N2, O2, and He are in good agreement with recently published values.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00048103
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 4
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): J NO 2 ; NO2 photolysis ; atmospheric photochemistry ; J NO 2 measurement
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Geologie und Paläontologie
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00210498
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 5
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): J NO 2 ; NO2 photolysis ; atmospheric photochemistry ; J NO 2measurement
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Geologie und Paläontologie
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00113977
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
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