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  • ENVIRONMENT POLLUTION  (2)
  • 1990-1994  (2)
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  • 1
    Publication Date: 2009-11-16
    Description: The effect of NO(x) (NO + NO2) from aircraft engine exhaust on ozone and climate is of increasing concern as a result of anticipated growth in the world's subsonic aircraft fleet and new international efforts to build a supersonic transport (SST). Knowledge of NO(x) emissions currently relies on limited ground based testing of combustors and engines and on scaling relations to extrapolate emission values to upper atmosphere conditions. Direct observations made in the engine exhaust plume of the NASA ER-2 high altitude aircraft cruising at subsonic speeds in the lower midlatitude stratosphere are presented. Results demonstrate the technical feasibility of detecting aircraft plumes within minutes after emission with sufficient completeness and precision to calculate emission indices for reactive nitrogen and other species. Furthermore, the combined results increase confidence in using ground based observations to assess the atmospheric impact of some aircraft emissions.
    Keywords: ENVIRONMENT POLLUTION
    Type: DLR, Impact of Emissions From Aircraft and Spacecraft Upon the Atmosphere; p 321-322
    Format: text
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  • 2
    Publication Date: 2014-09-23
    Description: The major gaseous components of the exhaust of stratospheric aircraft are expected to be the products of combustion (CO2 and H2O), odd nitrogen (NO, NO2 HNO3), and products indicating combustion inefficiencies (CO and total unburned hydrocarbons). The species distributions are produced by a balance of photochemical and transport processes. A necessary element in evaluating the impact of aircraft exhaust on the lower stratospheric composition is to place the aircraft emissions in perspective within the natural cycles of stratospheric species. Following are a description of mass transport in the lower stratosphere and a discussion of the natural behavior of the major gaseous components of the stratospheric aircraft exhaust.
    Keywords: ENVIRONMENT POLLUTION
    Type: NASA, Washington, The Atmospheric Effects of Stratospheric Aircraft: A First Program Report; p 33-61
    Format: application/pdf
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