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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 44, Iss. 9 — Mar. 21, 2005
  • pp: 1681–1690

Direct spectral measurements with a Brewer spectroradiometer: absolute calibration and aerosol optical depth retrieval

Stelios Kazadzis, Alkiviadis Bais, Natalia Kouremeti, Evangelos Gerasopoulos, Katerina Garane, Mario Blumthaler, Barbara Schallhart, and Alexander Cede  »View Author Affiliations


Applied Optics, Vol. 44, Issue 9, pp. 1681-1690 (2005)
http://dx.doi.org/10.1364/AO.44.001681


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Abstract

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 ~0.3 at 340 nm in winter and ~0.7 in summer.

© 2005 Optical Society of America

History
Original Manuscript: August 9, 2004
Revised Manuscript: October 30, 2004
Manuscript Accepted: November 8, 2004
Published: March 20, 2005

Citation
Stelios Kazadzis, Alkiviadis Bais, Natalia Kouremeti, Evangelos Gerasopoulos, Katerina Garane, Mario Blumthaler, Barbara Schallhart, and Alexander Cede, "Direct spectral measurements with a Brewer spectroradiometer: absolute calibration and aerosol optical depth retrieval," Appl. Opt. 44, 1681-1690 (2005)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-44-9-1681


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