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"1° 1975 1980 1985 1990 1995 Year

FIGURE 13.11 Percentage variations in total column ozone smoothed using a 12-month running mean for a network of stations in (a) Europe, (b) Eastern Siberia and the Far East, and (c) Western Siberia from 1973 to March 1994. The arrows show the expected QBO. In (c) the dashed line shows the component that has a periodicity expected for the QBO (adapted from Bojkov et al, 1994).

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FIGURE 13.10 Trends in 03 based on ozonesonde measurements (•) and Umkehr measurements (□) (adapted from Miller et at., 1995).

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