Ozone's Effects on UV documented



For the first time, scientists have recorded increases in ultraviolet irradiance through the Antarctic ozone hole. The measurements confirm the predicted effects of severe stratospheric ozone depletion on Earth.

During last year's austral spring, when ozone declined about 15% over Antarctica, mid-October ultraviolet (UV) levels were as high as those of summer two months later. Because ozone levels during the period of most severe depletion in 1988 were still twice those of 1987, when nearly half the ozone over some areas was destroyed, even greater UV levels than measured last year may occur in Antarctica this coming austral spring, when the ozone layer is expected by some atmospheric scientists to thin as much as in 1987.