processes will not be further elaborated. Instead the operation of these processes will be considered to introduce a fundamental uncertainty into the transport parameterization used in the present analysis. Only after sufficiently powerful three- dimensional chemical and dynamic models are constructed and checked against satellite observations of tracer movements will it be possible to significantly reduce the uncertainty of the present predictions. SUMMARY A simple diagnostic model has been developed to identify the quantities that control the magnitude of a corridor effect predicted to occur when substantial amounts of pollutants are injected into the atmosphere in a narrow latitude band. The diagnostic model is useful in delineating the roles of transport and chemistry and in understanding the predictions of numerical models. The quantities identified as critical to the development of a corridor effect for long-lived species are [1] the pollutant injection rate, [2] the background level of the species in the ambient atmosphere, and [3] the transport quantities related to the dilution rate of the pollutant. When the chemical lifetime of the pollutant is comparable or shorter than the characteristic time of transport, changes in the chemical production and loss rates must be included in the diagnostic model. Predictions from the diagnostic model are compared with those from Ames Research Center's two-dimensional model for the case of injection of H2O, H2, and NO by the proposed HLLV. Both models agree that corridor effects can be expected from such operations at altitudes above 60 km. However, uncertainties in the quantities critical to the prediction of the magnitude of the effect demand that these results be interpreted cautiously. Acknowledgments — The authors would like to thank L. Pfister, R.E. Young, and E.F. Danielsen for many fruitful discussions. The editor wishes to thank Michael Mendillo and John Zinn for reviewing this paper. REFERENCES 1. R.C. Whitten, W.J. Borucki, C. Park, L. Pfister, H.T. Woodward, R.P. Turco, L.A. Capone, C.A. Riegel, and T. Kropp, The Satellite Power System: Assessment of the Environmental Impact on Middle Atmosphere Composition and on Climate, Space Solar Power Review 3, 195-221, 1982. 2. R.P. Turco, O.B. Toon, R.C. Whitten, R.G. Keesee, and D. Hollenbach, A Study of Mesospheric Rocket Contrails and Clouds Produced by Liquid-fueled Rockets, Space Solar Power Review 3, 223-234, 1982. 3. S.S. Prasad, R.C. Whitten and R.P. Turco, The Satellite Power System: Assessment of Effects on the Lower Ionosphere, Space Solar Power Review (to be published). 4. G.V. Groves, Atmospheric Structure and its Variation in the Region from 25 to 120 km, CIRA 1972: COSPAR International Reference Atmosphere 1972, pp. 33-224, Akademic-Verlag, Berlin, 1972. 5. J.R. Holton, The Dynamic Meteorology of the Stratosphere and Mesosphere, pp. 162-169, Lancaster Press, Lancaster, PA, 1975. 6. J.F. Louis, Adjusted Mean Velocities and Diffusion Coefficients, CIAP Monograph 1, The Natural Stratosphere of 1974, Department of Transportation Report DOT-TST-75-51, 1975. 7. M.E. Schoeberl and D.F. Strobel, The Zonally Averaged Circulation of the Middle Atmosphere, J. Atmos. Sci. 35, 577-591, 1978. 8. J.R. Holton and W.M. Wehrbein, The Role of Forced Planetary Waves in the Annual Cycle of the Zonal Mean Circulation of the Middle Atmosphere, J. Atmos. Sci. 37, 1968-1983, 1979. 9. D. Cunnold, F. Alyea, N. Phillips, and R. Prinn, A Three-Dimensional Dynamical-Chemical Model of Atmospheric Ozone, J. Atmos. Sci. 32, 170-194, 1975. 10. R.J. Reed and K.E. German, A Contribution to the Problem of Stratospheric Diffusion by Large Scale Mixing, Mon. Weather Review 93, 313-321, 1965.
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