The exhaust emissions from civil subsonic aircraft at cruise altitude are important man-made sources that pollute the upper troposphere and the lower stratosphere (8-12 km). The formation of NOy species from NOx, both before and after the exit nozzle, have created increasing environmental concerns. Flight histories of Boeing 747-400 aircraft during the cruise stage between selected city pairs have been simulated using a computer program developed at Cranfield University. The passive distribution of NOx and HNO3 is calculated using the UGAMP three-dimensional chemical transport model. The sink of NOx, which is HNO3, is parameterized using an exponential decay process with an altitude-dependent lifetime. The model also includes transport by advection, vertical diffusion and convection. These simulations for January and July are analysed in terms of the resulting mean volume mixing ratios for both NOx and HNO3.
Implications of NOy emissions from subsonic aircraft at cruise altitude
1997-03-01
12 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Implications of NOy emissions from subsonic aircraft at cruise altitude
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