Abstract
Spectral actinometric measurements of direct solar radiation were made on all 17 clear days during 1981/82. From broadband measurements using cutoff fillers, a number of common measures for aerosol extinction as well as precipitable-water content of the atmosphere were derived by numerical analysis. Average Angström's turbidity coefficient β = 0.017 ± 0.006, wavelength exponent α1.6 ± 0.2, aerosol optical depth at 0,5 μm D(O.5) = 0.05 ± 0.001, and mean precipitable water w = 0.2 ± 0.1 cm were determined, matching the regional pattern known until now. Monthly, as well as daily,variations of observed atmospheric turbidity are discussed with respect to prevailing winds, synoptic patterns, and topography, revealing lowest turbidity for southwesterly flow. A review on 30 years of compatible aerosol optical thickness measurements at Antarctic coastal stations is added.
