Subsidence of aircraft engine exhaust in the stratosphere: Implications for calculated ozone depletions

Details Subsidence of aircraft engine exhaust in the stratosphere: Implications for calculated ozone depletions Subsidence of aircraft engine exhaust in the stratosphere: Implications for calculated ozone depletions

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21...69r&link_type=abstract

Geophysical Research Letters, Volume 21, Issue 1, p. 69-72

Other

8

Atmospheric Composition And Structure: Middle Atmosphere-Composition And Chemistry, Meteorology And Atmospheric Dynamics: Radiative Processes, Public Issues: Legislation And Regulation

Scientific paper

The deposition altitude of nitrogen oxides and other exhaust species emitted by stratospheric aircraft is a crucial parameter in determining the impact of these emissions on stratospheric ozone. We have utilized a model for the wake of a High-Speed Civil Transport (HSCT) to estimate the enhancements in water and reductions in ozone in these wakes as a function of time. Radiative calculations indicate differential cooling rates as large as -5 K/day at the beginning of the far-wake regime, mostly due to the enhanced water abundance. These cooling rates would imply a net sinking of the wakes of about 1.2 km after three days in the limit of no mixing. Calculated mid-latitude column ozone reductions due to emissions from a Mach 2.4 HSCT would then change from about -1% to -0.6%. However, more realistic calculations adopting moderate mixing for the wake reduce the net sinking to less than 0.2 km, making the impact of radiative subsidence negligible.

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