Abstract

Eleven months of atmospheric turbidity measurements were made in Tozeur, Southern Tunisia, located at the northern edge of the Sahara. These measurements were done with a Linke-Feussner actinometer equipped with broad band Schott filters (OG1, RG2, RG8). These filters were chosen, as they have demonstrated a good stability with time. The lowest values of turbidity were found in winter, which is the rainy season for this area. In spring (April) the largest number of sand storms were observed, but the turbidity remained high for the whole summer. A mean Linke turbidity factor of 5.39 was derived, which is a value otherwise generally found only in industrial areas. Mean values of Angstrom coefficients wereβ = 0.34 andα = 1.20.

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