Ozone, cloud, solar and UV-B levels at a low pollution, Southern Hemisphere, sub-tropical site for winter/spring 1995.

This paper analyses daily ozone, cloud cover, solar radiation and broadband UV-B data for winter/spring at a low pollution Southern Hemispheric sub-tropical site (27.80 degrees S). The average ozone concentration for the period was 290 DU. An anti-correlation is presented between the ozone and UV-B data over a 5 day period during winter. An ozone deficiency of 45 DU was calculated for the cloud free day on the 16th July, 1995, in which the UV-B level exceeded the clear sky envelope by about 6%. Part of this increase may be attributed to a decrease in cloud cover. In winter, the July average of the daily integrated UV-B irradiance was 29.0 kJ/m2, (a level which is comparable to that observed in Japan during the summer months).