Aviation and the Global Atmosphere

Aviation and the Global Atmosphere
changes, but they should not be viewed as predictions of the future.
The aircraft-related perturbation to atmospheric optical depth in the UV from soot and sulfate aerosols
is very small compared to the natural background opacity. The values presented in Table 3-4 imply
enhanced aerosol optical depths for soot and sulfates of less than 10-3 . The decrease in UVery
associated with such perturbations is less than 0.1%. Calculations indicate that, although an increase
in aerosols in the background atmosphere between 1970 and 2050 from sources other than aviation
would result in a reduction of UVery relative to clear skies, the percent change in UVery attributable to
aviation is relatively insensitive to background aerosol loading.
http://www.ipcc.ch/ipccreports/sres/aviation/060.htm (5 von 6)08.05.2008 02:42:42
Figure 5-9: Percent changes in UVery as a function of
latitude for July and October for a number of scenarios.