An assessment is provided of the potential environmental effects of fleets of subsonic, supersonic, and hypersonic aircraft. A general discussion of photochemical and transport modeling techniques is included along with a description of the LLL one-dimensional transport-kinetics model that was used in the assessment. Model simulations of the natural and perturbed stratosphere are used to compare theory with observations as a means of verification of model processes. A review is provided of engine emission indexes and 1990 fleet projections. Assessments of the potential effects of subsonic and supersonic aircraft fleets indicate a small increase in total ozone. However, the change in total ozone is the net difference between regions of ozone increase (in the lower stratosphere and upper troposphere) and ozone decrease (in the upper stratosphere). The percent change in the local ozone concentration is much larger than the change in total ozone. The effect of a proposed hydrogen fueled hypersonic transport fleet is a small reduction in total ozone. A study is made of the effect on these results of uncertainties in chemical rate coefficients, speculative chemical reactions, temperature feedback, hydrostatic adjustment, and various model parameters. The potential effect on ozone of aircraft emissions is compared with potential changes due to other anthropogenic perturbations. (ERA citation 05:014196)
Potential Environmental Effects of Aircraft Emissions
1979
233 pages
Report
No indication
English
Air Pollution & Control , Physical Meteorology , Physical & Theoretical Chemistry , Aircraft , Atmospheric chemistry , Stratosphere , Air pollution , Chlorine compounds , Environmental effects , Exhaust gases , Mathematical models , Nitrogen oxides , Ozone , Photochemical reactions , Reaction kinetics , ERDA/500200 , Assessments
Potential Environmental Effects of Aircraft Emissions
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