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  • 1
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    CHClF2 /F-22/ in the earth's atmosphere (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Recent global measurements of CHClF2 (F-22) are reported. Originally, GC/MS techniques were used to obtain these data. Since then, significant advances using an O2-doped electron capture detector have been made in the analytical techniques, so that F-22 can be measured by EC/GC methods at ambient concentrations. The atmospheric burden of F-22 calculated from these measurements (average mixing ratio, mid-1979, approximately 45 pptv) is considerably greater than that expected from the estimates of direct industrial emissions (average mixing ratio, mid-1979, approximately 30 pptv). This difference is probably due to underestimates of F-22 emissions.
    Keywords: ENVIRONMENT POLLUTION
    Type: Geophysical Research Letters; 7; Oct. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Report on concentrations, lifetimes, and trends of CFCs, halons, and related species (1994)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The atmospheric lifetimes of molecules containing chlorine and bromine are the dominant parameters influencing their ability to promote enhanced ozone destruction in the stratosphere. The purpose of this report is to assess the present state of knowledge of the lifetimes of halocarbons using two complementary approaches. First, a time series of measurements of gas concentrations is used together with information on their emissions histories and a computational model of atmospheric circulation and chemistry to infer lifetimes through a mass balance approach. Second, an atmospheric chemical-dynamical model is used with detailed information on the chemistry and spectroscopy of the molecules of interest to calculate lifetimes. The lifetimes determined by these two methods are then compared. Attention is focused most closely on fully halogenated chlorine- and bromine-containing molecules, primarily the chlorofluorocarbons, and the halons, because of their ability to deliver chlorine and bromine to the stratosphere. Some attention will be given to those molecules containing hydrogen, which are subject to removal in the troposphere primarily by reaction with OH and by other processes.
    Keywords: GEOPHYSICS
    Type: NASA-RP-1339 , NAS 1.61:1339
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Tropospheric chemistry (1985)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: The chemistry of the background troposphere, the source region, and the transition regions are discussed. The troposphere is governed by heterogeneous chemistry far more so than the stratosphere. Heterogeneous processes of interest involve scavenging of trace gases by aerosols, cloud and precipitation elements leading to aqueous phase chemical reactions and to temporary and permanent removal of material from the gas phase. Dry deposition is a major removal process for ozone, as well as for other gases of importance in tropospheric photochemistry. These processes are also discussed.
    Keywords: GEOPHYSICS
    Type: Atmospheric Ozone 1985. Assessment of our Understanding of the Processes Controlling its Present Distribution and Change, Volume 1; 36 p
    Format: text
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    NASA TECHNICAL REPORTS
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