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Table 1.2.

Table 1.2. Trends in biologically active radiation (weighted with the erythemal action spectrum of McKinlay and Diffey, 1987), derived from total ozone and cloud reflectivity measurements from the Total Ozone Mapping Spectrometer (TOMS, version 7) over 1979-1992. Adapted from Herman et al. (1996).
Latitude band
degrees
Trend(a)
% decade-1
Uncertainty(b)
± 2 sigma
60°S 70°S 4.5 5.5
60°S 50°S 5.5 4.5
50°S 40°S 3.5 3.5
40°S 30°S 1.5 2.5
30°S 20°S 2.0 2.5
20°S 10°S 1.5 2.5
10°S 0° 1.5 3.0
0° 10°N 1.0 3.5
10°N 20°N 0.0 2.5
20°N 30°N 1.0 3.0
30°N 40°N 3.0 3.0
40°N 50°N 3.5 3.0
50°N 60°N 5.0 4.0
60°N 70°N 4.0 4.0

  1. Zonally averaged trend over given latitude band, values rounded to nearest half percent.
  2. As corrected by Herman et al. (1998) and includes combined instrumental error and variability of UV radiances.

  3.  
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