February 28, 2007
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A Guide to Information on Greenhouse Gases and Ozone Depletion
Published July 1988 through June 1999
FROM VOLUME 9, NUMBER 5, MAY 1996
OZONE DEPLETION: AIRCRAFT IMPACTS
"Potential Impact of SO2 Emissions from Stratospheric Aircraft on
Ozone," D.K. Weisenstein (Atmos. & Environ. Res. Inc., 840 Memorial
Dr., Cambridge MA 02139), M.K.W. Ko et al., Geophys. Res. Lett., 23(2),
161-164, Jan. 15, 1996.
Shows that enhancement of the sulfate aerosol layer by aircraft emissions
could be a more significant impact than emissions of NOx, especially when NOx
emissions are reduced in future engines. Calculations show that aerosol surface
area in the stratosphere could be increased by factors of two to three.
"Subsonic Aircraft and Ozone Trends," A.E. Jones (Brit.
Antarctic Survey, High Cross, Madingley Rd., Cambridge CB3 0ET, UK), K.S. Law,
J.A. Pyle, J. Atmos. Chem., 23(1), 89-105, Jan. 1996.
Describes calculations of the impact that subsonic aircraft may already have
had on the atmosphere during the 1980s, using a 2-D chemical-radiative transport
model. Results show a significant increase in upper tropospheric ozone
over the period. They do not show any contribution to lower stratospheric ozone
loss, but they do highlight the sensitivity of the governing reactions at that
altitude to NOx concentrations. With the projected increasing trend of subsonic,
high altitude aircraft, the influence of their NOx emissions on lower
stratospheric ozone must be considered seriously.
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