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Atmospheric Effects of Aviation A Review of NASA's Subsonic Assessment Project (1999) / Chapter Skim
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1 Context for this Review
Pages 4-8

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From page 4...
... For instance, contrails, which are formed by water vapor and particulate matter in aircraft exhaust, may increase the amount of cirrus clouds in the atmosphere, thereby influencing radiative forcing. Likewise, ozone concentrations could be affected through the heterogeneous chemical reactions that take place on the surface of the particles emitted or formed in aircraft wakes and on naturally occurring clouds.
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From page 5...
... briefed the panel on other ongoing and planned research activities. These discussions of NASA's Tropospheric Chemistry Program, Upper Atmosphere Research Program, Radiation Science Program and atmospheric chemical modeling activities were extremely useful to the panel' s deliberations, and influenced the recommendations given in this report.
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From page 6...
... SASS's overall approach is designed to lead to formal assessment reports that can be used to guide decisions related to the development of a new generation of subsonic aircraft. The strategy taken by AEAP in general is to link the information gained from emissions characterization and laboratory studies to interpretation of near-field interactions and aircraft operational scenarios.
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From page 7...
... The panel feels that, in general, SASS has correctly identified the most important scientific issues, and the project's major objectives are all of considerable scientific interest. The SASS strategic plan represents a significant step forward in clarifying the goals and strategies of the program.
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From page 8...
... ; rather, they are limited to the particular issues that the panel feels present the greatest remaining sources of uncertainty and may present the most important opportunities for SASS to make progress in reducing uncertainties. Chapter 4 contains a list of the panel's highest priority concerns and recommendations, covering both scientific and management related Issues.
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Key Terms

  • subsonic aircraft
  • aircraft emissions
  • subsonic assessment
  • sass strategic
  • radiative forcing

  • water vapor
  • subsonic technology
  • research plan
  • atmospheric impacts
  • indirect radiative

  • science objectives
  • advanced subsonic
  • subsonic aviation
  • aircraft exhaust
  • major science

  • panel feels
  • sulfur emissions
  • earth science
  • chemical modeling
  • ozone concentrations

  • atmospheric observations
  • total anthropogenic
  • particles emitted
  • upper troposphere
  • understanding processes

  • assess impact
  • reducing uncertainties
  • includes carbon
  • sass research
  • nrc panel


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