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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