Evidence for Large Upward Trends of Ultraviolet-B Radiation Linked
to Ozone Depletion
J. B. Kerr and C. T. McElroy
Spectral measurements of ultraviolet-B radiation made at Toronto since
1989 indicate that the intensity of !ight 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.
Kerr, J.B. and McElroy, C.T., 1993: Evidence for Large Upward trends of
Ultrviolet-B Radiation Linked to Ozone Depletion. Science, Vol.
262, 1032-1034
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