Abstract
Direct Sun observations made by a Brewer spectrophotometer II were used to measure the ozone column (in DU), the ultraviolet radiation in the B region (UVB) (mW m−2 nm−1) and the aerosol optical depth (AOD) (320.1 nm) at Matrouh (31° 20′ N, 27° 13′ E) during the period January 1999 to December 2006. The mean monthly data are used to calculate the seasonal variation and trend in column ozone, UVB and AOD. The study shows that the seasonal variations in the ozone column and damage ultraviolet (DUV) radiation take maximum values in spring (320DU) and summer (105.42mWm−2nm−1) respectively, while the maximum value of AOD (0.14) was found at hot season. The analysis of the mean annual data from 1999–2006 for column ozone, UVB radiation and AOD show positive trends, with values of 0.059, 0.120 and 0.001, respectively.
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