Aviation and the Global Atmosphere

Aviation and the Global Atmosphere
Aviation and the Global Atmosphere
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Figure 2-4: Estimate of mean trend using all four measurement systems (i.e., Umkehr, ozonesondes, SBUV, and
SAGE I/II) at northern mid-latitudes (heavy solid line). Combined uncertainties are also shown as 1s (light solid
lines) and 2s (dashed lines). Combined trends and uncertainties are extended down to 10 km as shown by the
light dotted lines. The results below 15 km are a mixture of tropospheric and stratospheric trends, and the exact
numbers should be viewed with caution. Combined trends have not been extended lower into the troposphere
because the small sample of sonde stations have an additional unquantified uncertainty concerning their
representativeness of mean trends (WMO, 1998).
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