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Over the next century, there could be a 20 per cent increase in the amount of ultraviolet radiation reaching the high latitudes of the Southern Hemisphere during spring and summer, and a nine per cent decrease in ultraviolet radiation reaching the Northern Hemisphere’s high latitudes, they report.
They say the tropics can expect a four per cent increase in ultraviolet radiation.
The predicted increase in UV radiation for southern high latitudes will amount to almost half the increase associated with the “ozone hole.” It was caused by ozone-destroying chemicals used in refrigerants and aerosol cans that were phased out in the 1990s because of international concern.
As temperatures climb in coming decades, there will be marked changes in the circulation of the upper atmosphere and distribution of the ozone protecting Earth from the sun’s potent ultraviolet radiation, University of Toronto researchers Theodore Shepherd and Michaela Hegglin reported Sunday in the journal Nature Geoscience.
Hegglin and Shepherd used a computer model to assess climate change’s impact.