| Summary: | P(論文) Spectral measurement of direct solar radiation was made by sunphotometer (λ=368,500,675,778,862nm) at Syowa Station (69°00′S, 39°35′E, 21m a.s.l.), Antarctica in the period January 1980 through January 1981. Average aerosol optical thickness (λ=500nm) was 0.023±0.010 and its maximum appeared in October, minimum in November. Monthly mean Angstrom turbidity coefficient β lies in the range from 0.0045 to 0.0207 and α from 1.27 to 2.15. The present result was in good accordance with the recent measurement of optical thickness in Antarctica made by other reseachers. The most important finding is that turbidity at Syowa Station was fairly constant throughout a year, spectral extinction exhibit marked seasonal variation. It can be also found that the seasonal variation of spectral extinction is caused by the seasonal change of aerosol which has resulted from the seasonal difference of the origin of air mass. departmental bulletin paper
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