THE IMPACT OF NO_x AND H_2O EMISSIONS FROM FUTURE SUB- AND SUPERSONIC AIRCRAFT UPON THE CHEMICAL COMPOSITION OF THE ATMOSPHERE A model study using a stratospheric CTM

摘要

The impact of future aircraft emissions on concentrations of reactive nitrogen, water vapour and ozone has been calculated using the 3-dimensional stratospheric chemical transport model SCTM-1. Emissions of NO_x (NO+NO_2) and H_2O from both sub- and supersonic aircraft have been considered. NO_x emissions from subsonic aircraft flying in the troposphere and the lowermost stratosphere lead to a significant increase in ozone in the upper troposphere. Emissions of NO_x and H_2O from supersonic aircraft cruising in the stratosphere are calculated to decrease the column abundance of O_3. The effects of aircraft emissions are found to be strongly dependent on flight altitudes and on assumed emission indices for NO_x.