Ozone Depletion and High Flying Aircraft

I am astonished at how many researchers, that are not-familiar with the term "Chlorine Activation".!

Depending upon the altitude at which gases are emitted, and other factors, aircraft
emissions can either produce and destroy ozone.
Nitrogen oxides emitted by subsonic aircraft in the upper troposphere and lower
stratosphere, 9 to 13 km above the surface, are
expected to increase ozone and thereby decrease the amount of ultraviolet
radiation reaching the surface. Emissions at this altitude are more effective at
producing ozone in the upper troposphere than an equivalent amount of emissions
at the surface.

In contrast, supersonic aircraft cruise at higher altitudes of 17 to 20 km in the
stratosphere. Emissions of nitrogen oxides at these altitudes are expected to
deplete the stratospheric ozone layer.


TRUTH/FACT:

The Sensitivity of Polar Ozone Depletion to Proposed Geoengineering Schemes
Simone Tilmes,1* Rolf Müller,2 Ross Salawitch3

The large burden of sulfate aerosols injected into the stratosphere by the eruption of Mount Pinatubo in 1991 cooled Earth and enhanced the destruction of polar ozone in the subsequent few years. The continuous injection of sulfur into the stratosphere has been suggested as a "geoengineering" scheme to counteract global warming. We use an empirical relationship between ozone depletion and chlorine activation to estimate how this approach might influence polar ozone. An injection of sulfur large enough to compensate for surface warming caused by the doubling of atmospheric CO2 would strongly increase the extent of Arctic ozone depletion during the present century for cold winters and would cause a considerable delay, between 30 and 70 years, in the expected recovery of the Antarctic ozone hole.


http://www.sciencemag.org/cgi/content/abstract/320/5880/1201

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-sometimes called: heterogeneous chlorine reactions

http://www.agu.org/pubs/crossref/1996/96GL01957.shtml

http://www.atmos-chem-phys-discuss.net/4/4455/2004/acpd-4-4455-2004-print.pdf

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[FrostyCoug]

nice choice of voice ;)