Ultraviolet radiation in the Arctic: the impact of potential ozone depletions and cloud effects

The main findings are as follows: 1) stratus clouds provide significant protection from ultraviolet radiation exposure, but while stratospheric aerosols imply increased UVB exposure, 2) a redistribution of ozone from the stratosphere to the troposphere tends to decrease UV exposure, 3) a 20% ozone depletion leads to about 0.4 K/d cooling in the lower stratosphere, while redistribution of ozone from the stratosphere to the troposphere implies a warming of about 0.015 K/d in the upper troposphere; 4) stratus clouds may cause a large warming in the middle and upper stratosphere (0.8 K/d), 5) clouds have little effect on ozone photolysis leading to O(¹D) production at altitudes higher than 25 km, 6) for ozone photolysis leading to O(³P) production photolysis rates may increase by 50% or more throughout the atmosphere due to multiple scattering by stratus clouds. -from Authors