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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 demonstrated to supply tips to NASA's Atmospheric results of Aviation software (AEAP) by means of comparing the appropriateness of the program's learn plan, appraising the project-sponsored effects relative to the present kingdom of medical wisdom, making a choice on key medical uncertainties, and suggesting study actions prone to lessen these uncertainties.

Over the previous few years, the panel has written periodic experiences of either the subsonic aviation (Subsonic Assessment-SASS) and the supersonic aviation (Atmospheric results of Stratospheric Aircraft-AESA) parts of AEAP, together with: An intervening time evaluate of the Subsonic evaluate venture (1997); An period in-between evaluate of AEAP's Emissions Characterization and Near-Field Interactions parts (1997); An meantime evaluate of the AESA undertaking: technological know-how and development (1998); Atmospheric results of aviation: A assessment of NASA's Subsonic evaluate undertaking (1998). This file constitutes the ultimate overview of AESA and should be the final document written by way of this panel. the first viewers for those reviews is this system managers and scientists affiliated with AEAP, even though sometimes the themes mentioned are of curiosity to a much wider audience.

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GELLER, Program Officer PETER A. SCHULTZ, Program Officer DIANE L. GUSTAFSON, Administrative Assistant ROBIN MORRIS, Financial Associate TENECIA A. BROWN, Senior Program Assistant CARTER W. FORD, Project Assistant Page v COMMISSION ON GEOSCIENCES, ENVIRONMENT, AND RESOURCES Members GEORGE M. HORNBERGER (Chair), University of Virginia, Charlottesville RICHARD A. CONWAY, Union Carbide Corporation (Retired), S. Charleston, West Virginia THOMAS E. GRAEDEL, Yale University, New Haven, Connecticut THOMAS J.

1998b). , 1998). There is strong evidence that the volatile aerosols are formed through the conversion of SO2 emitted by the engines and then subsequently oxidized to sulfuric acid. The Fahey et al. (1995) measurements yielded a conversion rate of SO2 to sulfuric acid of 1245 percent, which is significantly higher than the one percent conversion rate predicted by previous studies. This finding has led to a large number of modeling studies and subsequent measurements, but for subsonic aircraft only (SUCCESS campaign, SULFUR-5 and 6 campaigns4.

The residence time of HSCT exhaust should be related to mean age, as both mean age and HSCT residence time depend on the strength of the mean meridional circulation and the isentropic mixing in the stratosphere between the tropics and middle latitudes. Because the stratosphere is not well mixed, and the HSCT emissions will be highly localized at middle latitudes, the mean age and HSCT residence time will not be identical. However, they should scale with one an- Page 18 other. Hence, if a specific model does not reproduce atmospheric mean age estimates well, it is unlikely to accurately model the HSCT effluent residence time.

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