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A Lagrangian Simulation of Subsonic Aircraft Exhaust EmissionsTo estimate the effect of subsonic and supersonic aircraft exhaust on the stratospheric concentration of NO(y), we employ a trajectory model initialized with air parcels based on the standard release scenarios. The supersonic exhaust simulations are in good agreement with 2D and 3D model results and show a perturbation of about 1-2 ppbv of NO(y) in the stratosphere. The subsonic simulations show that subsonic emissions are almost entirely trapped below the 380 K potential temperature surface. Our subsonic results contradict results from most other models, which show exhaust products penetrating above 380 K, as summarized. The disagreement can likely be attributed to an excessive vertical diffusion in most models of the strong vertical gradient in NO(y) that forms at the boundary between the emission zone and the stratosphere above 380 K. Our results suggest that previous assessments of the impact of subsonic exhaust emission on the stratospheric region above 380 K should be considered to be an upper bound.
Document ID
19990064481
Document Type
Preprint (Draft being sent to journal)
Authors
Schoeberl, M. R. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Morris, G. A. (Valparaiso Univ. IN United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 1999
Subject Category
Environment Pollution
Distribution Limits
Public
Copyright
Other