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The Atmospheric Effects of Stratospheric Aircraft Project An Interim Review of Science and Progress (1998) / Chapter Skim
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Pages 46-48

The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.


From page 46...
... Through laboratory measurements of the rates of newly recognized heterogeneous chemical reactions, and simultaneous in situ measurements of almost all active chemical species at altitudes up to 20 kilometers, AESA has shown that heterogeneous reactions involving sulfuric-acid aerosols deactivate NOX in the lower stratosphere. Looking at patterns of correlation between reactive species and tracers such as N2O and CH4 has yielded new understanding of atmospheric chemistry and atmospheric motions.
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From page 47...
... Only when the evolution of liquid and solid PSC particles in the winter polar stratosphere is known can the effects of the additional input of HSCT-related gases and aerosols be properly assessed. PAEAN recommends that AESA support field measurements as well as model developments that are specifically designed to unravel the complex formation process of polar stratospheric cloud particles.
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From page 48...
... PAEAN recommends that AESA continue its present policy of not undertaking model studies of the impact of aviation on climate, beyond calculating the degree of radiative forcing by components of HSCT exhaust. BEYOND THE 1998 ASSESSMENT Many of the uncertainties noted earlier, such as those related to transport processes, microphysics, and heterogeneous chemistry, have not yet been sufficiently reduced to permit an informed assessment of the possible atmospheric effects of a fleet of HSCTs to be made.
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Key Terms

  • polar stratospheric
  • aesa continue
  • situ measurements
  • major uncertainties
  • hsct exhaust

  • properly assessed
  • formation process
  • model studies
  • additional input
  • initiative model

  • chemical species
  • climate studies
  • critical uncertainties
  • field measurements
  • regime continue

  • sufficiently reduced
  • cloud particles
  • recognized heterogeneous
  • beyond calculating
  • treat atmospheric

  • winter polar
  • transport processes
  • properly described
  • lower stratosphere
  • support field

  • studies aesa
  • chemical reactions
  • stratospheric cloud
  • aircraft missions
  • heterogeneous reactions


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