A Review of NASA's 'Atmospheric Effects of Stratospheric by National Research Council, Division on Earth and Life

By National Research Council, Division on Earth and Life Studies, Environment and Resources Commission on Geosciences, Panel on Atmospheric Effects of Aviation

The NRC Panel at the Atmospheric results of Aviation (PAEAN) used to be tested to supply advice to NASA's Atmospheric results of Aviation application (AEAP) via comparing the appropriateness of the program's examine plan, appraising the project-sponsored effects relative to the present kingdom of medical wisdom, picking key clinical uncertainties, and suggesting study actions more likely to decrease these uncertainties.

Over the previous few years, the panel has written periodic studies of either the subsonic aviation (Subsonic Assessment-SASS) and the supersonic aviation (Atmospheric results of Stratospheric Aircraft-AESA) elements of AEAP, together with: An intervening time evaluation of the Subsonic overview undertaking (1997); An intervening time overview of AEAP's Emissions Characterization and Near-Field Interactions parts (1997); An meantime evaluation of the AESA undertaking: technological know-how and growth (1998); Atmospheric results of aviation: A evaluate of NASA's Subsonic evaluate undertaking (1998). This file constitutes the ultimate evaluate of AESA and should be the final file written by means of this panel. the first viewers for those studies is this system managers and scientists affiliated with AEAP, even if at times the subjects mentioned are of curiosity to a much wider audience.

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A Review of NASA's 'Atmospheric Effects of Stratospheric Aircraft' Project

The NRC Panel at the Atmospheric results of Aviation (PAEAN) was once tested to supply information to NASA's Atmospheric results of Aviation software (AEAP) through comparing the appropriateness of the program's examine plan, appraising the project-sponsored effects relative to the present country of clinical wisdom, picking key medical uncertainties, and suggesting learn actions prone to decrease these uncertainties.

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Also, if fuel sulfur levels decrease over the next few years, as predicted, then some type of lubricant may need to be added to the fuel to offset the lost sulfur. The nature of any replacement lubricant and its impact on the atmosphere must be assessed. The new combustor concepts, such as LPP, are designed for optimum operation in the stratosphere. , over land), they will be operating subsonically, in both the stratosphere and troposphere. It is not known how HSCT emissions will be affected by subsonic operation.

1998) and Arnold et al. (1998) have recently employed an advanced, species-specific technique, namely, CIMS (Chemical Ionization Mass Spectrometry), to measure SO2 and H2SO4 in situ in the aircraft plume and also show significant variations in the reported conversion rates of SO2 to SO3 and H2SO4. The formation and evolution of the particles formed in the engine plume is also not well-represented by existing models or theory. Until very recently, the formation of aerosols was explained in terms of classical (homogeneous heteromolecular) nucleation theory, a process that has been shown to produce large numbers of new particles on short time scales (Doyle, 1961; Mirabel and Katz, 1974).

Although many parts of the AEAP's research program could feasibly be supported through other existing programs, there is concern that certain critical research topics would ''fall through the cracks'' between these other programs. Maintenance of an applied program such as AEAP adds considerable value to the overall research efforts by providing a focus for multiagency and multidisciplinary coordination, and by helping the research community provide a coherent source of input into national and international assessment activities.

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