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Science 12 November 1993:
Vol. 262. no. 5136, pp. 1032 - 1034
DOI: 10.1126/science.262.5136.1032
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Articles

Evidence for Large Upward Trends of Ultraviolet-B Radiation Linked to Ozone Depletion

J. B. Kerr 1 and C. T. McElroy 1

1 Environment Canada, Atmospheric Environment Service, 4905 Dufferin Street, Downsview, Canada M3H5T4

Spectral measurements of ultraviolet-B radiation made at Toronto since 1989 indicate that the intensity of light at wavelengths near 300 nanometers has increased by 35 percent per year in winter and 7 percent per year in summer. The wavelength dependence of these trends indicates that the increase is caused by the downward trend in total ozone that was measured at Toronto during the same period. The trend at wavelengths between 320 and 325 nanometers is essentially zero.

Submitted on September 2, 1993
Accepted on October 15, 1993


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