Journal
APPLIED OPTICS
Volume 44, Issue 9, Pages 1681-1690Publisher
OPTICAL SOC AMER
DOI: 10.1364/AO.44.001681
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We present three different methods for the absolute calibration of direct spectral irradiances measured with a Brewer spectroradiometer, which are shown to agree to within +/- 2%. Direct irradiance spectra derived by Brewer and Bentham spectroradiometers agree to within 4 +/- 3%. Good agreement was also found by a comparison of the aerosol optical depth and Angstrom exponent retrieved by the two instruments and a multifilter rotational shadowband radiometer. The spectral aerosol optical depth (300-365 nm) derived from six years of direct irradiance measurements at Thessaloniki shows a distinct seasonal variation, averaging to similar to 0.3 at 340 nm in winter and similar to 0.7 in summer. (c) 2005 Optical Society of America.
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