Effect of weather conditions on UV-B radiation reaching the earth's surface

No increase has been found in the long-term UV-B data series despite ozone depletion. This is partly due to the fact that atmospheric parameters strongly affect UV-B values measured at the surface of the earth. The aim of our study is to determine relationships between UV-B and atmospheric parameters. The parameters studied in this work were cloudiness, transparency of atmosphere and global radiation. Useful relationships were found for each of these parameters. Clouds can significantly reduce UV-B radiation if cloud cover is greater than 50%. UV-B radiation increases with increasing wide range transparency of the atmosphere; this increase grows stronger as the sun rises. Good correlation was found between the ratio of UV-B to transformed global radiation and total ozone. A radiation amplification factor (RAF) value of 0.9 was obtained.